Good afternoon and welcome to Sports Mole's live text commentary from day five of the US Open.
A packed day of action from Flushing Meadows gets going with Laura Robson's third-round clash with Li Na. The young Brit took out Belgian legend Kim Clijsters earlier this week and will fancy her chances against the number nine seed.
A host of stars are in action throughout the fifth day, including Novak Djokovic, Maria Sharapova, Andy Roddick and Juan Martin del Potro.
Please note that play will begin just after 4pm UK time.
3.20amThe night surely belongs to Andy Roddick though. A-Rod will be sticking around for a bit longer after his superb win over Bernard Tomic. Remember to visit Sports Mole tomorrow as we guide you through another exciting day in the US Open. Goodnight everyone!
3.18amThe American presenter treats us to a particularly uncomfortable interview with Azarenka where we hear more about rap music than tennis. I think the less said about that, the better.
3.16amBefore we do finish for the night, Kohlschreiber has just won a five-set marathon against Paire. The German managed to edge victory in the tie-break to ensure his participation in the tournament continues.
3.15amZheng was no match for Azarenka's class tonight. The Belarusian dominated from the outset and she'll fancy her chances of winning a second Grand Slam of the year.
3.14amAzarenka progresses Zheng sends a forehand long and Azarenka completes the victory. The world number one looks delighted as she salutes the crowd.
3.13amZheng has no answer for Azarenka's power and the 28th seed's serve is no trouble for the world number one. A wide forehand brings up match point.
3.10amAzarenka isn't concerned by Zheng's performance and a couple of long backhands hands the top seed the advantage. She follows them with a big forehand to move further ahead.
3.09amZheng has looked better in this set but it doesn't seem to be enough against the power of Azarenka. A superb rally is finished with a delicate volley by the Chinese player, 15-30.
3.05amAzarenka breaks back A forehand into the net is followed by an error from Zheng and Azarenka is two games from victory.
3.03amAzarenka reacts brilliantly to move Zheng around the court throughout the game and force two break points.
3.01amZheng takes her first game Superb from Zheng as she returns well to force an error from Azarenka and to win her first game of the match.
3.00amZheng has a break point now as she outlasts Azarenka during the longest rally of the match. Wonderful play from Zheng to leave her opponent with no chance.
2.58amThat will help the atmosphere! Zheng dictates play nicely before unleashing a powerful forehand past Azarenka. 0-30.
2.57amAzarenka starts the new game with a double fault, the crowd have lost interest in this one-sided affair.
2.56amBreak We may see this match finish very soon. Azarenka watches a looping backhand bounce out to give her a 3-0 lead in the second set.
2.54amZheng is overjoyed as she claws Azarenka back to deuce but a brilliant forehand brings the world number one another chance.
2.52amI'm trying to find some positives for Zheng but she's being outclassed tonight. A couple of superb backhands set up a smash to give Azarenka yet another break point.
2.50amThe crowd cheer an Azarenka mistake, probably because they want to stay a little bit longer. No more mistakes as the top seed extends her lead after a Zheng error.
2.48amThe match is being played at an incredible pace as Azarenka fires down a couple of fast serves to edge closer to another game triumph.
2.45amBreak Azarenka doesn't want to waste time and the power of the Belarusian gives her another break of serve with Zheng only able to muster a single point in the game.
2.44amZheng begins the new first set and a couple of crushing blows gives Azarenka an immediate advantage with three break points.
2.41amAzarenka takes the first set It's all looking a bit easy for the world number one. A long backhand hands Azarenka the first set and there's not too much of a threat coming from Zheng.
2.39amZheng is digging her heels in during this game but Azarenka seems to move effortlessly around the court to earn set point.
2.35amBreak It's a gift for Azarenka! Zheng double faults to give the top seed the chance to serve for the set.
2.34amAzarenka wins a challenge to replay a point at 30-30 and takes advantage to earn yet another break point.
2.32amMuch better from Zheng, a good second serve is followed by a big forehand. 30-15.
2.30amThere's no troubling Azarenka at the moment. The top seed dominates another game, clinching a 4-0 lead with a passing backhand winner.
2.26amBreak What a start from Azarenka! The Belarusian approaches the net to place a forehand wide of Zheng to break her opponent's serve again, 3-0.
2.25amThree break points for Azarenka, a brilliant backhand flies past Zheng.
2.24amThe wind is causing problems for Zheng but Azarenka is not concerned as a powerful return gives her a 0-30 lead.
2.22amSuperb from Azarenka as Zheng is given no chance with a cross court forehand winner. The world number then wraps up the game with a well placed serve, 2-0.
2.21amThe pair are back level in the game when Zheng fires a forehand into the net.
2.20amZheng responds well with some powerful hitting from the back of the court and she's 0-30 ahead.
2.18amBreak It's not a good start for Zheng, Azarenka breaks her serve immediately to take charge.
2.17amSuperb movement from Azarenka, a well placed smash gives her an early break point.
2.16amSlight opening here for Azarenka, a wide backhand makes it 15-30.
2.14amWe're ready to start and it's Zheng to serve first.
2.12amKohlschreiber has forced a fifth set against Paire, it's very tense stuff out on court 13 tonight. We'll keep you updated.
2.11amOnly five games dropped so far for Azarenka so far and she looks in good form to add to her Australian Open victory.
2.10amAzarenka is now warming up with Zheng, she'll want to impress during he first match under lights in New York. Will the world number one continue her bid for the US Open title?
2.04amI'm sure Roddick didn't mind too much. He was on top form during that win and he'll be hard to beat if he performs like that again.
2.02amHaving said that, I'm not sure why the organisers didn't put Roddick on last tonight.
2.01amWe'll be focusing on Azarenka until we finish tonight though. The top seed could benefit from the pressure being applied to Serena Williams in this tournament and cause problems. On her day, Azarenka is a joy to watch.
2.01amWe'll be focusing on Azarenka until we finish tonight though. The top seed could benefit from the pressure being applied to Serena Williams in this tournament and cause problems. On her day, Azarenka is a joy to watch.
1.57amBenneteau is still alive in the tournament after coming through a 3-6 6-4 7-6 7-5 winner against Novikov.
1.55amThe top seed in the women's draw, Victoria Azarenka, is up next and she'll face Zheng Jie from China.
1.51amRoddick insists that the match was a "lot of fun" and it was definitely enjoyable to watch. The former champion looks delighted and there will be plenty wishing that he continues this form.
1.49amRoddick progresses It's superb from the home crowd favourite. Roddick completes the comfortable victory with yet another ace and his final tournament is not over yet!
1.45amBreak Another unforced error gives Roddick the game and he'll be here for a bit longer. The American is set to serve for the match.
1.44amTomic is looking poor now, two big mistakes give Roddick another chance of a break.
1.42amTomic has quality, no doubt and he proves that with a powerful forehand during the game. Roddick seems in no mood to offer chances to his opponent though and an ace means he is now 4-0 ahead.
1.39amPaire has edged ahead again in his contest with Kohlschreiber by winning the third set 6-3.
1.38amBreak Wow! Roddick looks inspired tonight and he breaks Tomic again with a superb volley that leaves the Australian with no chance. Tomic can't even get a point in the game.
1.37amElsewhere, Tatishvili has completed her victory over Minella with a 6-0 triumph in the second.
01.34amI feel sorry for Tomic here. He may have just turned up on the wrong day, superb from Roddick as dictates play well to move 2-0 ahead.
01.33amBreak A weak shot from Tomic hits the net again and Roddick has an early break of serve.
01.32amBig moment, Tomic hammers his forehand into the net and it's a break point for Roddick.
01.31amWhat a point! Roddick manages to change direction on three occasions during the rally before placing a volley just wide of Tomic's reach.
1.30amThe crowd are treated to some dancing from a Roddick supporter during the break, only in New York.
1.27amSet An ace brings Roddick set point and the American extends his lead with a forehand winner.
1.26amA couple of big first serves puts Roddick 30-15 ahead. He's on fire tonight.
1.25amRoddick manoeuvres the ball superbly to leave himself with a simple forehand to take a 5-4 lead. He'll serve for the second set.
1.23amThe door is open slightly for Roddick, a big forehand makes it 30-30 and a wide call gives him a break point.
1.21amAnother quick game from Roddick, he's determined to make his career last that little bit longer, 4-4.
1.20amThe stadium has filled up nicely now and Roddick continues his good from on serve with an ace that Tomic doesn't attempt to return.
1.17amTomic survives though as Roddick hits his backhand into the net to make it 4-3 to the Australian.
1.16amRoddick is angry as he misses a simple forehand to give Tomic a 30-0 lead. Poor from Tomic as he sets up an easy smash though. 40-15.
1.12amTomic really needs this set, I'm not sure if he'll be able to come back from two sets down with Roddick in this type of mood. It's more of the same, Roddick is at around 78% with his first serves and it's now 3-3.
1.11amAnna Tatishvili leads Mandy Minella on court 17 after taking a tight first set 7-5.
1.10amNo fear from Tomic though and two big serves hand him the game, 3-2.
1.09amTomic allows Roddick back in with an error and this could be crucial, Deuce.
1.07amRoddick's slice backhand is a problem for Tomic but the Australian is fighting hard to go 30-15 ahead.
1.05amRoddick's serve looks the same as it did 10 years ago. Tomic puts the ball wide and the scores are level in the second set at 2-2.
1.03amTomic really isn't playing badly but he's struggling to trouble Roddick. A good volley puts the 30-year-old in charge,
1.01amSuperb forehand from Tomic is out of Roddick's reach and the Australian holds when his opponent blast his shot long. 2-1.
1.00amThe Arthur Ashe Stadium crowd are really being treated tonight, Tomic and Roddick are locked in a real battle with the third game currently at deuce.
12.59amPlenty of updates from the other courts, Phillip Kohlschreiber levels his match against Benoit Paire with a 6-3 triumph in the second set and Julian Benneteau takes a 2-1 lead over Dennis Novikov after winning a tie-break.
12.57amPerfect game from Roddick, 1-1.
12.55amToo good from Roddick, the American moves nicely around the court for the first point before delivering a trademark serve straight down the middle to go 3-0 ahead.
12.54amMuch better from Tomic, he doesn't give Roddick a sniff. 1-0
12.53amTomic composes himself at the start of the second set, perfect start for him as he sends a backhand that kisses the line.
12.51amSET Of course it's a big ace, Roddick takes the opener 6-3 and he fully deserves the lead.
12.50amPoor from Tomic, he pushes too hard and it's set point for Roddick.
12.50amBoth players are happy to play their big ground strokes, Tomic goes wide with a forehand. 30-0 Roddick.
12.49amRoddick is set to serve the match and it's a good start with a big forehand that leaves Tomic with no chance.
12.48amIt's important for Tomic to not fight the crowd and he does well to deliver some good serves to take the game.
12.47amThe wind is definitely a factor in this match, Tomic tries his best to move Roddick around the court but a big smash gives the point to the American.
12.45amReally good signs from Roddick early on here, the veteran moves into a 5-2 lead with another solid service game littered with big shots. I'm sure the world of tennis are wishing he can go as far as possible in his last tournament.
12.44amGrega Zemljia has just completed a 6-4 2-6 6-4 6-4 victory over Cedrik-Marcel Stebe to book his place in the next round of this tournament in New York. That's a good win from the Slovenian.
12.40amIt may not be tactic we always see from Roddick but the American has sampled with serve and volley already to lead 4-1 with another solid service game in front of the New York crowd.
12.38amRoddick's sevre is looking as quick as ever but his volleying is not there so far. A huge serve puts him 30-15 ahead.
12.35amBetter from Tomic, the Australian dictates the play well during two rallies to take charge of the game before finally getting on the scoreboard.
12.34amRoddick is looking eager to come to the net but he's not rewarded as he slams a volley into the net, 15-0 Tomic.
12.33amGood recovery from the 20th seed and Roddick moves into a 3-0 lead.
12.32amFive aces so far for Roddick but a mistake as he close in the net brings the score to 40-30.
12.31amIt looks like Roddick has someone pulling the strings for him, a big forehand hits the top of the net to drop on Tomic's side.
12.29amTomic is struggling early on and Roddick breaks his opponent's serve. Tomic needs to settle early here.
12.27amIt's time to turn our attentions to another American with a big serve. Andy Roddick, in what could be his final match, is 1-0 up against Bernard Tomic.
12.25amMany thanks to Liam and as I greet you, Isner has completed the victory. The big serving American books his place in the next round.
12.23amRight time to hand over for me after a marathon day at Flushing Meadows. Callum Mulvihill will guide you through the night session as Nieminen gets the hold to make it 5-3 in the fourth set.
12.22amThe Finn hangs on with a good serve and we go back to deuce.
12.21amMatch point Isner.
12.20amInser wants to wrap this match up right now and gets aggressive at the baseline. He leads 15-30 on Nieminen's serve.
12.18amNieminen is now serving to stay alive at Flushing Meadows, huge effort required from the Finn.
12.17amThe American comes up with his biggest serve of the night at 144mph, to rapturous applause from the crowd. More importantly it gives Isner a 5-2 lead in the fourth set.
12.15amIsner is just two games away from the match and just needs to maintain composure to reach the finish line.
12.13amNieminen gets aggresive on serve to try and finish the game off. He finds an ace and does just enough to get the hold. He now trails 4-2 in the fourth set.
12.11amNieminen is under pressure on serve, still with a slight lead and game point at 40-30.
12.08pmThe American brings his ace count for the match to 21 and holds serve to love in the process. He now has a commanding 4-1 lead in the fourth set. Tough ask now for the Finn to mount a comeback
12.06amIsner takes his chance, smacking a forehand winner down the baseline. Nieminen will be thoroughly frustrated to give up a break so easily.
12.05amAnd as I say that, its break point to Isner. Nieminen is punished for some sloppy second serves and this is an early chance in the set for the American.
12.03amStraight back to a 'you hold, I'll hold' formula in the early going of the fourth. Three games gone, three easy wins for the server.
12.01amWith that huge serve still prominent Isner looks confident to finish this in four sets. Job far from done though, at time Nieminen has shown wonderful defensive reflexes.
11.58pmIsner has the third set in the bag 6-4 and is now firm favourite for the match against a game Nieminen.
11.51pmWill to continue to battle on. Set point Isner on the Finn's serve for anyone still reading. Stay with me people.
11.44pmApologies for a technical issue with our live blog, we hope to back to normal very shortly. To confirm we are still very much on serve in the fourth set, with Isner and Nieminen level at four games apiece.
11.44pmApologies for a technical issue with our live blog, we hope to back to normal very shortly. To confirm we are still very much on serve in the fourth set, with Isner and Nieminen level at four games apiece.
11.40pm4-3 Isner here in the fourth set and we are still on serve for the second consecutive set. Nieminen gets the better of a brilliant exchange at the net with some sharp reflexes to start his service game.
11.40pm4-3 Isner here in the fourth set and we are still on serve for the second consecutive set. Nieminen gets the better of a brilliant exchange at the net with some sharp reflexes to start his service game.
11.40pm4-3 Isner here in the fourth set and we are still on serve for the second consecutive set. Nieminen gets the better of a brilliant exchange at the net with some sharp reflexes to start his service game.
11.36pmStill on serve here and things are getting a little tense on the Louis Armstrong. The situation is not helped by a phone going off, made even more embarrassing when it turns out to the umpires.
11.36pmStill on serve here and things are getting a little tense on the Louis Armstrong. The situation is not helped by a phone going off, made even more embarrassing when it turns out to the umpires.
1.36pmStill on serve here and things are getting a little tense on the Louis Armstrong. The situation is not helped by a phone going off, made even more embarrassing when it turns out to the umpires.
1.36pmStill on serve here and things are getting a little tense on the Louis Armstrong. The situation is not helped by a phone going off, made even more embarrassing when it turns out to the umpire's.
11.32pmNieminen is growing in confidence all the time and looks the more likely in this third set with some fine defensively play.
11.29pmThe American recovers well and steps things up on serve. He thunders a huge shot across court and just about does enough to hold once more.
11.27pmIsner misses a forehand down the line and Nieminen has two break points. Huge opportunity.
11.26pmIsner is under pressure straight away on serve in the next game and trails 15-30. Chance here for the Finn.
11.24pmNieminen gets out of jail and shows nice variety on serve in doing so. All square at 2-2 in the fourth set now.
11.23pmJarkko picks a horrible time to double fault and its break point, but he gets out a jail with a controlled forehand to take things back to deuce.
11.22pmHe takes out his frustration on the tennis ball with a mean forehand to get to deuce on Nieminen's serve. Chance of a break here.
11.20pmIsner is furious with the umpire again after another late call from the line judge. Pressure is getting to the big American.
11.19pmThe games are being rattled off thick and fast early on in this forth set. Isner with another rapid-fire hold to go 2-1 ahead.
11.16pmNieminen wastes no time responding in kind. Simple hold the the Finn and we are level at 1-1 in games and sets.
11.14pmThe American earns an easy hold and we return to type in the early going in the third set.
11.12pmNieminen is alive and kicking in this match with that second set in the bag. Isner looks annoyed and unleashes an ace to kick things off in the third.
11.10pmA strong serve from Nieminen and Inser can't get the return back in play. The second set goes to the Finn. Game on!
11.09pmUnforced error from Isner give the Finn a set point.
11.08pmA frantic exchange at the net earns Nieminen the point, back level at 5-5.
11.07pmIsner goes to the well once to often with that forehand pass, 5-4.
11.06pmBad mistake from Nieminen at the baseline gives Isner the mini-break and a 5-3 lead.
11.05pmBrilliant passing forehand down the line from Isner edges him into a 4-3 lead.
11.04pmThese two need to make their minds up, an Isner double fault levels things once more at 3-3 at the change of ends.
11.03pmIsner earns a couple of cheap points as the Finn gets sloppy on serve. 3-1 to the giant in the tie-break.
11.02pmNieminen breaks back instantly after a sloppy second serve from the American. 1-1
11.01pmIsner gets the mini-break with the first point after a long rally.
11.00pmIt's tie-break time in the second set, something has to give.
10.59pmIsner is wasting no time in taking this second set to a tie-break. He holds to love with, you guessed it, a couple of bombs on his serve.
10.58pmNieminen duly replies to make it 6-5 here in the Louis Armstrong. An order of play has just been released for day six at Flushing Meadows, which includes Andy Murray, Roger Federer and Serena Williams. The feast of tennis continues into the weekend.
10.54pmAnother hold in the bank for Isner and we are locked at 5-5 in the second set.
10.53pmA quick ace follows and the American is in the driving seat on serve yet again. Tiebreak anyone?
10.52pmIsner mixes things up with a serve and volley and he goes 15-0 up as a result.
10.51pmIsner will serve after a change of ends to stay alive in the set.
10.50pmAnother game in this second set, another hold, this time for the Finn. That makes it nine in a row and 5-4 Nieminen overall.
10.48pmIsner falls back on that trusty serve to bail him out once again. A tough hold there for the American and the second set is locked at 4-4.
10.46pmBig forehand from Nieminen down the line gives him a sniff of a break at 15-30.
10.44pmIsner has an average serve of 127mph so far in this match. That is an incredible statistic, right up there with the biggest servers in the history of the game.
10.43pmThe Finn is up to the challenge and secures a forth successive hold of serve.
10.41pmPressure back on Nieminen, 15-15 early on as the Finn serves.
10.40pmIsner is not afraid to come into the net in short spells, and dashes to the line to complete a smash to wrap up another game. 3-3 in the second set.
10.39pmSomething has to give in this second set after five successive serves. Isner makes another strong start to a service game with a huge serve.
10.37pmThe Finn uses his experience to get the hold, he now leads 3-2.
10.36pmNieminen has looked more secure on serve in this set so far and seems to have settled down. A double fault stops me in my tracks and Isner has a chance of a break at 30-30.
10.35pmIsner smashes an ace followed by a ferocious forehand to secure the gold. Still on serve at 2-2 in the second set.
10.34pmNieminen has taken advantage of a lapse in concentration. An important chance at 30-30.
10.32pmIsner just berated a line judge for calling a foot foul on his serve, to audible jeers from a disappointed crowd.
10.31pmTime to watch Isner do his thing on serve once more. Nieminen needs to try and make inroads, easier said than done.
10.29pmThe Finn digs deep to get a crucial hold. Neither player is showing sparkling form but Isner looks the better bet with that giant weapon of a serve.
10.28pmNieminen can't keep the run of flawless service games going. Isner forces a couple of errors and we are at deuce.
10.26pmIsner wastes no time in finding the perfect response, holding to love in quick fashion to make the second set all square.
10.25pmThe Finn gets the straightforward hold he so badly wanted. 1-0 Nieminen to start the second set.
10.23pmNieminen starts the second set on serve and will be desperate to re-establish himself in this match quickly.
10.22pmA topsy-turvy first set included three breaks of serve, but Isner's strong start was eventually enough to see him over the line by six games to three.
10.21pmIsner ends up at the net, not a natural position for the giant. It makes no difference to the outcome of the first set, the American uses his considerable reach to launch an unstoppable overhead smash.
10.20pmDouble set-point for Isner after another crushing serve.
10.19pmIsner will now serve for the set, the Finn looks frustrated and has been broken twice in this opening set.
10.18pmNieminen is not laughing now. Isner smacks a huge return down the baseline to earn two break points, and repeats the trick to take the game.
10.17pmA fun rally on Nieminen's serve ends with a double deflection of the net. The Finn kicks the ball into the air and draws a laugh from a packed crowd.
10.14pmSuperb shot by Jarkko to get the break, a thunderous forehand down the line. We are now back on serve in the first set at 3-4 to Isner.
10.13pmAnd I jink yet another player in this first week at Flushing Meadows. Nieminen takes advantage of a slow second serve to thunder a forehand winner for break point.
10.11pmIsner's serve looks impenetrable at this early stage. He's back to thundering bombs down the court with precision.
10.09pmThe Finn holds in style and reduces the deficit to 4-2 in the first set.
10.08pmStill waiting for Nieminen to really get going on the Louis Armstrong. He mixes things up at the net to great effect for his best point of the match.
10.05pmIsner holds to love with another impressive service game. 4-1 to the American in just over ten minutes.
10.04pmThat's more like it for the Finn, who puts his first game on the board with a big serve of his own out wide.
10.03pmNieminen desperately needs his first hold in this game to get a foothold in this match. He is 40-15 ahead.
10.01pmIsner holds with minimal fuss to go 3-0 up in the first set. The giant couldn't have asked for a better start to this second-round match.
9.59pmThe Finn fluffs a volley at the net and Isner goes a break up in the early going. Horrendous start considering how strong the American is on serve.
9.58pmNieminen has made a sloppy start on serve to hand Isner two quick break points.
9.56pmA first ace of the match for the American registers at 135mph. He makes it two in a row to hold his first service game.
9.55pmInser makes a sluggish start on serve and we have a 30-30 tie in the opening game.
9.54pmIsner will unleash his bomb of a serve first as this match gets underway.
9.52pmAmerican hopeful John Isner is about to do battle with Jarkko Nieminen.
9.51pmThe matches come thick and fast at Flushing Meadows and we are about to join another interesting clash at the Louis Armstrong Stadium.
9.44pmSwiss stalward Stanislas Wawrinka is also all-sqaure with Steve Darcis at a set apiece.
9.42pmOn Court 17 Marcos Baghdatis is level with Alexandr Dolgopolov at one set each. All to play for in that baseline battle.
9.40pmElsewhere in the men's singles an intriguing match is developing over on Court 11. Australian veteran Lleyton Hewitt is in a battle with Gilles Muller. He trails by two sets to one, with the fourth finely poised at 4-4.
9.36pmDel Potro dominated the early going but played a sloppy third set to let Harrison back in the match. The Argentine was back to his best in the fourth to seal things 6-2 6-3 2-6 6-2.
9.34pmAnd its all over as Harrison smashes one into the net. Del Potro will be relieved to get that one and book his place in the next round.
9.33pmHorrible double fault from Harrison hands Del Potro three match points.
9.32pmDel Potro wants to end this now. He goes super aggressive on the Harrison serve and is 0-30 up.
9.29pmDel Potro is in no mood to let Harrison back in this fourth set and is smashing serves across the court. He takes an easy hold and is now just one game away from the match.
9.26pmHarrison says alive with a comfortable hold, including a sixth ace. He now trails 4-2 in the fourth set.
9.21pmHarrison is trying to attack Del Potro's serve but that is quite literally a tall order. The Argentine holds to take a 4-1 lead.
9.18pmHarrison plays a sloppy pair of points under pressure and this time Del Potro doesn't let him off the hook. Valuable break for the Argentine and he leads 3-1 in the fourth set.
9.15pmDel Potro closes down a poor drop shot but fluffs his lines at the net. 15-30 and a let off for the American.
9.14pmHarrison has made a shocking start to this game and needs a big effort to hold serve, he trails 0-30.
9.12pmOver on Arthur Ashe Maria Sharapova is moments away from wrapping up her match with Mallory Burdette in straight sets. Ruthlessly efficiency from the Russian.
9.10pmDel Potro takes advantage to earn a difficult hold. The fourth set stays on serve, but real encouragement for Harrison that he can still launch a comeback.
9.09pmHarrison slams a forehand into the net under no real pressure. Chance missed.
9.08pmDel Potro's serve saves him on break point but he loses a long rally with a lazy forehand. Break point number two in this game for Harrison.
9.06pmHarrison piles on the pressure and earns a big break point.
9.05pmBoth players huge serves are earning easy points all over the place at the start of this set. Del Potro is the man who needs them most, he looks the more tired of the two.
9.03pmA quick hold for the American, 1-1 in the early going of the fourth set.
9.02pmHarrison gets the home crowd going with a strong ace on his serve, followed by a one-handed winner down the baseline.
9.01pmDel Potro matches Harrison for prowess on the volley, caressing a deft shot over the net to clinch the opening game of set four.
9.00pmLovely slice from Harrison for the first time in the match keeps him alive in the game. 40-30.
8.59pmThe Argentine serves first in the fourth and looks to have regained his composure, showing a nice touch at the net. Cue the 'great touch for a big man' comment.
8.56pmDel Potro fell apart a bit there in the third set and needs to find his form again quickly or this will become a genuine contest.
8.54pmSET IN THE BAG got Harrison and he is in the back in the match.
8.53pmThe American surges into a 30-0 lead.
8.51pmHarrison has the double break in the bank and will serve for the third set.
8.49pmDouble-fault from the Argentine who looks to have lost all concentration. 5-2 now in the third set to Harrison.
8.48pmDel Potro tries a ridiculous lob which floats harmlessly into the net. Break point Harrison.
8.47pmAnd I'm back just in time to see Harrison earn break point on the Del Potro serve once again, that is no mean feat. The Argentine battles back and we are at deuce.
8.45pmRight, it's short and sweet from me tonight. Liam's had his turbo-charged coffee and is ready to go again. Here he is...
8.44pmDel Potro made life difficult for Harrison there but the American's serve got him out of trouble to hold. He now leads 4-2.
8.43pmGAME, SET AND MATCH! Mayer 6-1 6-4 4-6 7-5 Robredo
8.42pmDel Potro digging in here, 30-30...
8.38pmSimple stuff from Del Potro now as he holds serve. That took him about 30 seconds.
8.37pmSET! Dolgopolov 6-4 Baghdatis
8.35pmHarrison remaining dogged from the back of the court and holds to put himself 3-1 ahead.
8.31pmDel Potro responds well to the early setback with a hold thanks to some big serving.
8.30pmJust as I say that he gains the advantage before whacking an ace past the big Argentine to consolidate the hold. The American leads 2-0.
8.29pmHarrison is struggling a bit here. He was 40-0 but Del Potro has pulled it back to deuce.
8.25pmBREAK! Now then. Del Potro hits a second double fault and Harrison breaks. The start of the comeback?
8.24pmHarrison has the chance for a break point there but Del Potro's club-like forehand gets him back to deuce. It is one of the meatiest shots in the men's game, that's for sure.
8.22pmBad news for Wimbledon men's doubles champions Jonny Marray and Frederik Nielsen as they are knocked out of the men's doubles in straight sets by the team of Levine and Matosevic. Never mind, boys - we'll always have SW19...
8.19pmIt's the first time that these two have played each other on the Tour and it's likely that the Argentine will chalk up the first win unless Harrison can produce some sort of miracle.
8.18pmClinical stuff from Del Potro as he breaks again to take the second set 6-3. It looks a long way back for Harrison now.
8.17pmSET! Del Potro 6-2 6-3 Harrison
8.16pmBeautiful from Del Potro. He caresses a nonchalant volley past Harrison to make it 0-30.
8.15pmA real battle of wits for that rally, but Harrison eventually hits wide.
8.14pmHello there! Right, straight into the action for me as Del Potro holds to love to give himself a 5-3 lead in this second set. Harrison serving to stay in it.
8.12pmI'm going to take a short break from the relentless action from Flushing Meadows. I'll leave you in Jack Prescott's capable hands for the rest of the second set between Del Potro and Harrison.
8.10pmThe American earns a hold and he reduces the deficit to 4-3 in the second set.
8.09pmHarrison needs to regroup here and go back to serving strongly and regain confidence.
8.07pmDel Potro holds to love and holds a 4-2 lead in this second set.
8.03pmThe giant Argentine is also up a break in the second set against the American in a baseline battle.
8.01pmOver at the Louis Armstrong Stadium Juan Martin Del Potro has a one-set lead against Ryan Harrison, and that is where we will this live blog next.
7.57pmHe is joined in round three by Richard Gasquet, who beat Bradley Klahn in straight sets to equal his best-ever US Open.
7.52pmIt's all over, Novak Djokovic drops just five games in a demolition job on Rogerio Dutra Silva.
7.51pmTriple match point for Djokovic in double-quick time.
7.49pmA second hold for the Brazilian forces Djokovic to serve for the match. A matter of time.
7.48pmDutra Silva is once again swimming against the tide as he serves to stay in the match.
7.45pmNice to see the Brazilian hold off the onslaught. Djokovic is playing at such a high level today only an elite band of players could even compete.
7.43pmAnd there we go, Dutra Silva gets the hold but don't think he appreciated the ironic applause of the crowd. That makes it 4-1 in the third set.
7.41pmNovak is now 4-0 up and Dutra Silva looks desperate to avoid a third-set whitewash. Got to get some first serves in play to make it happen though.
7.37pmDjokovic earns a third consecutive break and he is coasting towards a simple straight-sets victory. A matter of time on Arthur Ashe and the Serb looks in imperious form.
7.36pmDutra Silva is struggling on serve once again. Djokovic shows up his full range of skills with a chip volley to earn yet another break point.
7.34pmNice piece of on-court humility from both players as Djokovic mistakes a grunt from Dutra Silva for an out call. Both laugh and the point is replayed.
7.32pmNovak looks annoyed and steps things up, powering into the net and disguising a delicate volley. 2-0 in the third to the second seed.
7.30pmThat's more like it from the Brazilian. He makes deuce on the Djokovic serve after a punishing point at the baseline. Nice to see he is not giving this one up.
7.26pmDjokovic gets an immediate break to take control of the third set. Just no let up for Dutra Silva, who plays well in patches but his serve is lacking at this level.
7.25pmNovak fights back as the baseline brutality continues. 30-30 in the opening game of the third set.
7.23pmHuge point from Dutra Silva to start the third set as he ends a long baseline battle with a huge winner on the baseline. A hail Mary shot comes good.
7.19pmDjokovic is wearing a hat to avoid the glare of the New York sun, but he doesn't need it as he's barely broken sweat so far. He leads by two sets in just over an hour on Arthur Ashe.
7.17pmA couple of sloppy points undoes all the good work from the Brazilian. Another break for a ruthless Serbian and he will serve for the second set.
7.16pmDutra Silva is trying to fight back and forces deuce in his next service game, showing a nice touch at the net.
7.13pmDjokovic wraps up another hold to love and has a 4-1 lead in this second set. Not sure how the Brazilian begins to build bridges in this one. Would like to think that alliteration lifted his mood a touch.
7.09pmBreak point for Novak and its far too easy. Silva fires an aimless backhand wide and its 3-1 to the Serb with minimal fuss.
7.06pmDutra Silva needs to dig deep and make easier work of his serve to try and make a match of this in the second set. Tall order.
7.04pmDjokovic wastes no time earning the easiest service hold I've seen so far this week. At the times the Serb makes things look ridiculously easy.
7.02pmThe Brazilian wins a marathon opening service game in the second set after an incredible nine deuces.
6.59pmWe will join the match at 6-3 1-0, with the Serb lining up an early break in the second set.
6.56pmOver on Arthur Ashe defending men's champion Novak Djokovic has raced into an early lead against Rogerio Dutra Silva.
6.53pmWhile we pause for breath after that superb display from the 18-year-old let's head around Flushing Meadows and find another match to sink out teeth into.
6.52pmSo for the first time in 1998 British tennis fans have an interest in the women's singles. Brilliant stuff.
6.50pm"Li is a great hitter so I knew I would have to run absolutely everything down, so thats exactly what I did."
6.48pmRobson: "I had a few break points early on and I wasted a couple with some average returning. When I got a chance again I knew I just to had to go for it."
6.47pmRobson: "I knew that if I just kept sticking with her and going for my shots that it could pay off, and it did."
6.44pmRobson: "I honestly don't know how I pulled that out. I was bitterly disappointed after losing the second set after coming so close."
6.43pmLet's here from the 18-year-old now as she speaks to US television after a superb display.
6.42pmShe will now face defending champion Sam Stosur in the fourth round, the first time a British woman has got this far in a Grand Slam since 1998.
6.41pmRobson was so impressive in all areas, displaying mental toughness and maturity beyond her years.
6.39pmThat is a huge shock from Robson in without question the biggest breakthrough week of the 18-year-old's short career. She has now beaten two Grand Slam winners in successive matches. Just incredible.
6.38pmShe's done it. Robson produces a mature, composed display to beat world number eight Li Na 6-4 6-7 6-2.
6.37pmLi's forehand return goes long, match point Robson!
6.36pmRobson is still under pressure on serve at 30-30 as she tries to secure the match.
6.33pmAnother silly shot from Li and that makes it 5-2 to Robson. The Chinese girl's game has fallen apart under pressure and the 18-year-old will serve for a place in the fourth round.
6.32pmUnstoppable return from Robson earns the Brit two more break points.
6.31pmLi looks frustrated on serve as she misses wildly with her first two shots. 0-30 to Robson here and a chance to take a stranglehold on the match.
6.30pmSuperb movement from Robson earns the hold as she moves two-games clear in the final set.
6.29pmGreat composure again from the Brit as she sends another massive serve down the line for an ace. That makes it 40-0 on serve.
6.28pmRobson is up at the umpire's chair to voice her concerns once again as she wins a challenge on her serve.
6.27pmRobson is edging ever closer to a momentous victory here against a top-ten opponent. Needs to maintain composure on serve now.
6.26pmYou really have to admire the 18-year-old's composure there. Far more senior players have allowed a bad line call to completely throw their state of mind, but the Brit stays strong to earn a vital break.
6.25pmAnother fantastic point and justice is done with a break for the Brit. Robson crashes another powerful winner off the baseline to lead the final set 3-2.
6.25pmWell played Robson, forcing Li into a mistake on the baseline to earn a further break point.
6.24pmBack to deuce again then and Robson must try and keep her concentration after a tough call.
6.23pmHer shot was clearly unplayable but the umpire rules that the point must be replayed. Tough luck on the Brit who protests in vain.
6.22pmA horrible call from the line judge costs Robson break point.
6.21pmRobson peppers the baseline with a superb return to earn yet another break point.
6.20pmLi slams the door to a break shut with a ruthless ace. Deuce time.
6.19pmI jink the ninth seed as she double faults to let Robson back in. Break point again to the Brit.
6.18pmLi shows no sign of the panic that crept into her last service game, rattling off two successive points.
6.17pmAim has to be to put pressure of Li's serve now for the British youngster.
6.16pmThe 18-year-old takes my advice and produces a hold to love with some particularly efficient serving.
6.15pmLi now leads the final set 2-1, important for Robson to hang in there now.
6.14pmSwing and a miss from Robson on her forehand hands Li a nervy hold. The Brit had chances to get a timely break there and may rue not taking those opportunities.
6.13pmLi stays relentless and forces Robson off balance. Deuce number six is followed by an easy Li point to hand her the advantage.
6.12pmDelightful point from Robson and she earns another break point. Needs to take her chance now.
6.11pmRobson comes back fighting again, deuce for a fifth time in this game.
6.10pmAdvantage Li after an unforced error at the net from the Brit.
6.09pmRobson lets a shot crash out of the court to hand Li game point. The ninth seed can't take advantage and we race back to deuce.
6.08pmLi sticks to her guns and saves the break with a strong forehand down the line. Back to deuce.
6.07pmBig forehand winner from Robson to earn break point.
6.06pmLi gives up a double fault and an early chance of a break here in the third for Robson at 30-30.
6.05pmRobson serves her seventh ace of the match ro round off a comfortable hold. 1-1 in the early stages of the third set.
6.02pmRobson is made to work hard but makes a good start to her service game. Another well-timed ace gives her a 40-15 lead.
6.00pmInto the third set and Li wastes no time in holding her opening service game, in stark contrast to the start of the second. Pressure on the Brit now to respond.
5.58pmA quick update from the Arthur Ashe and defending champion Sam Stosur has booked her place in the fourth round with a straight sets victory over Varvara Lepchenko.
5.57pmThat tie-break was the first time Li consistently forced Robson into difficult situations. Could go either way at this stage in a fascinating battle.
5.57pmRobson misreads a shot on the baseline and with it gives up the second set. Li battles back and we are heading to a third and final set on the Louis Armstrong.
5.56pmLi serves an ace and its set point for the ninth seed.
5.55pmBrilliant response for the 18-year-old, she steps her game up to draw level yet again. 5-5 now in a topsy-turvy battle.
5.55pmLi produces her strongest point of the match in a long rally. Robson is forced to stand and stare at a beautiful forehand inner. 5-4 to the Chinese player.
5.54pmRobson takes things back to the baseline after a strong Li return. The tactic pays off and we are level again at four points apiece in the tie-break.
5.53pmRobson aims a hopeful winner down the line but it falls wide. 4-3 to the ninth seed.
5.52pmUnforced error in the next point for Robson makes the tie-break 3-3 as the players switch ends. Still all to play for here and the crowd are responding.
5.52pmLi is not finished yet, she opens up her racket and delivers a monstrous forehand down the baseline. 3-2
5.51pmLovely double-handed backhand across the court makes it 3-1 to the Brit.
5.50pmLi comes back with a huge serve to make 1-1, but falters with an unforced error in the next point. 2-1 and a mini break for Robson.
5.49pmShe responds brilliantly as the tie-break begins, smashing a forehand winner to go 1-0 up.
5.48pmLi swats a slice across the court to send the second set into a tie-break. Huge stage of the match now to test Robson's fortitude.
5.47pmRobson moves in on a second serve but misreads the flight and its an ace for the ninth seed.
5.46pmShe follows that up with a cracking forehand winner down the line. That is more like what we have come to expect from the former French Open winner. 30-15.
5.45pmLi gets the better of a baseline battle to kick things off in this crucial game with a flat forehand.
5.44pmRobson is once again just one game away from the match as Li serves to stay alive at Flushing Meadows. Tense.
5.43pmLi finds a response with a forehand winner but a massive Robson ace gives the plucky Brit a 6-5 lead in the second set.
5.42pmRobson is back on serve and makes a confident start, winning the first two points. She follows that up with some superb movement and its 40-0.
5.41pmNice variety from Li to earn the hold, back to 5-5 in the second set now.
5.40pmRobson wins another baseline slugfest to reduce the deficit to 30-15. Li quickly responds with a smash at the net to earn two game points.
5.38pmLi starts well in this vital game and races into a 30-0 lead.
5.37pmLi will now serve to stay in the match, Robson is on the edge of a huge upset victory in the Louis Armstrong Stadium.
5.36pmGreat composure from Robson again on serve, taking her time to win an important game, she leads 5-4 in the second set.
5.35pmRobson serves a big ace and this game is finely poised at 30-30.
5.33pmThat makes the score 4-4 now in the second set, a crucial service game coming up here for Robson.
5.32pmShe aims a ferocious backhand high, wide and handsome and the game is now level at 30-30. Li follows up that point with a huge pair of serves to take the game.
5.30pmIt's another unforced error from Li and a huge chance for Robson, 15-30 on the ninth seed's serve.
5.29pmJust a quick update from the Arthur Ashe to let you know that defending champion Sam Stosur has taken the first set in a tie-break against Varvara Lepchenko.
5.28pmBig hold there from Robson under some intense pressure, she leads 4-3 in the second set and will look to up the ante in Li's next service game.
5.27pmRobson squeals in anger as an unforced error gives up a break point, but that is followed up by an ace. Great character from the Brit and its advantage Robson.
5.24pmNice touch at the net from Robson brings her game point, but double fault number six brings the score back to deuce. Testing time here for the 18-year-old.
5.23pmThe double faults are creeping into Robson's game now, make that five of the pesky errors.
5.22pmRobson is back on serve and makes a good start, two easy points and its 30-0.
5.21pmLi regains her composure to level up the second set at 3-3. The ninth seed looks relieved to escape with the hold in that game.
5.20pmAnother unforced error from Li hands Robson break point. Huge chance here for the Brit, which she spurns.
5.19pmRobson has closed the gap in this game after Li raced into a 40-0 lead. We are locked at deuce and Li looks increasingly annoyed.
5.17pmStill a big job to do though for the 18-year-old against the world number eight, who continues to struggle on serve.
5.16pmThe crowd at the Louis Armstrong is growing with every game, word of Laura Robson's superb display must have spread.
5.14pmEvery time the talented duo have exchanged a lengthy rally its the Brit who comes out on top. Robson follows up an ace with a mighty forehand to hold once more and go 3-2 up.
5.13pmThe world number eight recovers to earn her first hold of the second set, which now stands at 2-2.
5.11pmLi's second serve is being punished all the time, Robson keeps the pressure on and we head to deuce.
5.10pmLi is struggling a touch on serve and needs to deal better with the windy conditions. 30-30 in this game.
5.09pmHis Olympic doubles partner Laura Robson has made a fantastic start on the Louis Armstrong and she continues with a delightful double-handed backhand on Li's serve. No mercy from the teenager.
5.08pmOur feed at Flushing Meadows flashes to Andy Murray as he arrives for training ahead of tomorrow's third-round clash with Feliciano Lopez.
5.07pmNo mistake from Robson on serve this time and she leads 2-1 with the fist hold of the second set. Looks so promising at times for the British starlet.
5.06pmThat's more like it for Robson on serve and she makes her first ace, at a powerful 108mph. Scorchio
5.05pmThe second set has made a strange start, two games, two breaks and a whole host of baseline winners.
5.04pmLi loads up on her forehand side to ward off the first break point but an injection of pace from Robson makes the difference to win the game.
5.02pmAnd yet again its a killer return that catches the eye, this time from Robson to earn two break points.
5.01pmGame Li and its another break of serve. Neither woman is showing any kind of form on serve and as a result the scoring is inconsistent. Good recovery from the ninth seed after losing the first set.
4.59pmStrong backhand winner from Na earns an early break point in this second set.
4.58pmAnother double fault from the Brit, thats three in total and we are at deuce.
4.56pmThe 18-year-old makes a solid start with a pair of strong forehand winners. 40-15.
4.55pmA quick break over and Robson will serve first in the second set.
4.54pmNeither player looks particularly comfortable on serve in windy conditions but its Robson who has dealt with the situation better. 6-4 in the first set is a fair reflection after some sloppy play from the ninth seed.
4.53pmFirst set to Laura Robson. Li drags a cross-court forehand wide and the Brit goes a set up and its fully deserved. Three breaks of serve already for Robson.
4.52pmTwo set points coming up for the Brit.
4.51pmA couple of unforced errors followed by a double fault from Li and Robson has another chance to break. Game finely poised at 15-40.
4.50pmRobson will be disappointed with that last service game, chance gone. Li now serves to try and bring the set level.
4.49pmLi earns the break as Robson picks an awful time to serve a double fault. We are back on serve and the Brit leads 5-4, still all to play for in this first set.
4.48pmHuge return from Li earns a break point. Robson looks frustrated, big pressure on this next serve.
4.47pmRobson responds well and brings the score back to 30-30.
4.46pmLi sends one down the line and has a chance of a break. 15-30
4.45pmNice variety from Robson to make a move at the net. 15-15
4.44pmA first challenge of the match goes against the Brit which leads to a double fault. 0-15
4.43pmComfortable hold from the eighth seed, that makes the score 5-3. Robson will now serve for the first set.
4.42pmLi starts a crucial service game well with a second ace.
4.41pmA huge plume of smoke is visible from behind the court outside Flushing Meadows. Hope that doesn't effect play. Apart from a storm on day one we have been pretty lucky on the weather front so far this week.
4.40pmAnother game in the bank for Laura after a composed second serve. She leads 5-2 in the first and Li will serve to keep the set alive.
4.38pmRobson's movement has been key in this first set, forcing Li into some pretty basic errors.
4.37pmThunderous shot on the forehand side again from Robson, she's hitting winners with such natural ease again today.
4.36pmLi slips to the floor and Robson has a second break, she leads 4-2 in the first set. Brilliant stuff from the teenager.
4.35pmA brilliant exchange at the baseline and Robson comes out on top with a powerful forehand out wide. Break point for the young Brit.
4.33pmA pounding return from Robson out side and she has a sniff of a break here at 15-30.
4.32pmA second double fault from Li early on in this match, slightly worrying sign for the ninth seed.
4.30pmNa is applying pressure once again but Robson stays strong to earn a good hold. The Brit is back in the lead at 3-2 in the first set.
4.29pmRobson plunges a forehand into the umpire's chair. Quick movement from the referee avoids a nasty collision with a powerful shot there, and an instant entry for You've Been Framed.
4.28pmImportant for Robson to show some consistency on serve in this next game.
4.27pmNa has found her feet on serve and is growing in confidence. She holds to love to level things up at 2-2.
4.25pmAn encouraging start for Robson despite giving up the break back. Li has a real match on her hands today that is for sure.
4.23pmRobson drives a forehand wide and the ninth seed breaks back instantly. 2-1 to the Brit in the first set.
4.22pmBreak point to Li as she looks to hit straight back.
4.21pmA couple of super shots from Na as she looks for an immediate response on the Robson serve. 15-30
4.20pmA Na forehand goes long and the Brit has an early breakthrough. 2-0 Robson in the first set.
4.19pmLovely play from Robson earns the teenager a fourth break point.
4.18pmStrong ace from the ninth seed followed by a wide forehand from Robson in the next point. Na hits another flat serve and we are back to deuce.
4.17pmRobson has an early chance after some unforced errors from the Chinese star. Three break points for the Brit.
4.16pmA change of ends in the New York sunshine and its Na's turn to get her first service game underway.
4.15pmGame Robson and its a fine start for the youngster. She used her variety of groundstrokes to get her out early trouble there.
4.14pmNa uses her power to make this a close opening game, we are locked at 30-30.
4.13pmNice ace to start for Robson, that settles the nerves.
4.12pmHere we go, Robson to serve first.
4.09pmRobson will be the underdog once again against the former Grand Slam winner, but that did not stop her against Kim Clijsters in the second round.
4.08pmYou can follow every shot from Flushing Meadows right here with us as Sports Mole.
4.07pmWe are just a few minutes away from starting on the Louis Armstrong Stadium as Laura Robson takes on Li Na.
