Live Commentary: Madison Keys vs. Agnieszka Radwanska - as it happened

Good afternoon everyone and thank you for joining us as we provide you live coverage as Madison Keys takes on Agnieszka Radwanska in the women's quarter-finals at Wimbledon.

The winner of this clash will take on young Spaniard Garbine Muguruza, who has just beaten Timea Bacsinszky in straight sets on Court One.

BREAK! Radwanska looks to impose herself early on and she forces Keys into two errors, but the American soon hits back with a forehand winner. Keys seeks to push Radwanska a little harder and she wins out as her Polish opponent makes a mistake trying to return on the forehand as the ball flies out of the court. Two more errors from Radwanska give Keys the break point, and she takes it when Radwanska fails on the backhand.

BREAK! Strong service from Keys sees her establish a short lead, but she then fails on the return as Radwanska draws level. Keys pulls out an error again, only to respond with a standout forehand winner that sends her opponent the wrong way. Radwanska battles back to setup her own break, which is reached when keys comes up short again, this time on her backhand as the ball flies into the net.

Radwanska comes up short when she pushes far too long to put Keys ahead at 30-15, but the American can't hold on as she fires beyond the baseline at 30-30. Radwanska misses one horribly to give Keys break point, but the youngsters drops it by hitting straight into the net. The Polish star eventually holds out on her serve as Keys falters on the backhand.

Keys shines early on in the fourth with a splendid ace that flies beyond her opponent at 103mph. A brutal smash then sets up a reply from Radwanska that flies wide down the line. The score moves to 40-0 as the American sees the ball loop over her head and out. Radwanska claims a point back with a deft chip down the line, but Keys finally takes the game after her opponent fails on the backhand.

More power from Keys to draw level at 15 each with a splendid hack across the court on Radwanska's second serve. Real brutal work from the youngster. Errors from both players take the scores to 30-30, before Keys pulls ahead with a standout forehand to establish the break point. Radwanska soon fights back as Keys hits the net, only for the American to move back to advantage with a whopper of forehand volley. Radwanska hangs on in there to force her own advantage, which see takes when Keys can only find the net.

Keys continues to show some power off her own serves and she forces Radwanska into several errors, before grasping a lead with a standout ace. The American wraps up the game when her opponent can't quite come up with the required forehand to return.

Radwanska isn't being moved by the power of her opponent and she moves to 40-0 without response. Keys managed to get one point in, but the Polish star soon has everyone smiling with a crafty forehand winner.

It's Radwanska's turn to come on strong now and she hits hard to establish a chance for a break. Keys manages to battle back and brings about her own advantage with what is perhaps her best forehand of the game. Keys then produces a vital ace to hold her serve.

Back on her own serve, Radwanska pushes 30-0 ahead and that soon becomes 40-0 when Keys fires a poor forehand across the face of the court and wide. Radwanska soon closes out the game when Keys goes long and out yet again.

Key comes up with the vital hold as she displays great accuracy to race into a 30-lead. However, the American commits an error to bring Radwanska back into the game, although she abates any fear of a comeback with a sublime smash following a 10-shot rally. Another solid point with a forehand winner across the court to tie things up 5-5.

Holds don't come much simpler than that for Radwanska as she takes the game with a love service. Her serve is accurate and puts the American under immediate pressure, which fires her into a 30-lead. Keys goes for depth on her last two returns to get into the game, she goes long on both shots to hand the game to Radwanska.

Keys feels the heat from the Russian as she commits two unforced errors when she serves to stay in the set. Her serve returns at just the right moment with two powerful efforts down the 'T' to tie the game at 30-30. However, Keys then commits a double fault to hand Radwanska a set point, but she hits back with a well-played point before hitting a cross-court winner on her forehand. The Pole carves out two further set points, but a wide backhand and a sublime sliced volley at the net from Keys keep peg the game back to deuce. The 20-year-old sends the set to a tie-breaker by sealing the final two points with solid forehands.

Radwanska takes an early lead with an error from the American.

Keys levels the score with a solid forehand which the Pole cannot return.

Radwanska forges ahead with a forehand down the line, which the American cannot return.

Another error from Keys hands Radwanska a two-point lead as her backhand hits the net.

The Pole takes complete control of the tie-breaker as Keys goes long with her forehand.

Keys cannot control the length of her forehand to the baseline and the Pole has a four-point lead at the changeover.

Huge point for the American as she wins on her serve as Radwanska's return is poor and Keys slams a forehand past her.

Keys comes right back into the tie-breaker as she wins another point on her forehand.

The Pole carves out three set points with a vicious serve down the 'T', which the American cannot return.

SET! Radwanska takes the first set as she wins the point on an error from the American.

Solid start from Keys as she races into a 40-0 lead due to accuracy off her serve which puts the Pole under pressure. An unforced error hands the Pole a point and a way back into the game, but she then goes wide with a volley at the net to give the first game to the 20-year-old.

The Pole continues to dominate on her serve as she surges into a 40-0 lead. The American struggles once again for the depth on her returns which presents Radwasnka with easy points, and although she commits one error, the 26-year-old levels the set with relative ease.

Keys plays some of her best tennis of the match to hold serve as she works the Pole around the court with an impressive array of groundstrokes. She secures the game with a fine shot across the court to regain the lead in the set.

Radwanska has earned some good cheap points in the match and she continues with the first point of this game, before Keys slices her volley into the net to hand her a 30-0 lead. The Pole shows her flexibility to bend down to scoop a low forehand off the floor, but her stroke slams into the net, although she quickly brings up game point as Keys follows suit. The American goes for a long forehand on a return and again misses the baseline by a considerable distance to lose the game.

Keys gets off to a poor start as she has all the time in the world to pick her spot on a cross-court smash, but overhits her effort. The Pole makes her pay again following a good rally as she finds the line with her forehand, but Keys discovers rhythm on her serve to hit back with an ace down the 'T'. Radwanska attempts an audacious lob, but misses the baseline by centremetres and then slams a backhand into the net to hand the American game point. A long backhand brings up deuce, but the 20-year-old's serve bails her out as she wins two cheap points to secure the game.

The American wins the first point of the game with a forehand return, but the Pole hits back quickly with her serve to take a 30-15 lead. Keys plays the point of the match as she volleys at the net before being lobbed by the Pole, but she recovers to smash a forehand past her opponent. However, her efforts are in vain as the 26-year-old ups the ante to earn the final two points with powerful play.

Keys' serve has been the only thing keeping her in the match and she continues to be display consistency to draw an error from the Pole to win the first point. Her accuracy does not wain and she is able to clinch the game with relative ease in a love service game by working Radwanska around the court.

BREAK! Keys secures the first break of the set and will now serve for the second set. The American takes the initiative for the first time in the match against Radwanska's serve as she races into a 40-0 lead, including one fine backhand down the line from the Pole's second serve. The 26-year-old rallies with an ace, but Keys earns the first break of the set as her backhand clips the top of the net and takes a fortunate bounce on the Pole's side of the net.

SET! Keys serves out and levels the match at one set apiece. Radwanska comes out with an aggressive approach to try to get back the break, but the American counteracts her hitting with power of her own on her forehand. Keys earns a set point following a cross-court forehand and then a winner down the line, but the Pole hangs around to bring her back to deuce. However, Keys finds her rhythm once again to earn the final two points needed to secure the set.

Radwanska takes an early lead with a forehand down the line, but Keys responds with a powerful backhand at the feet of the Pole. The 26-year-old finds her rhythm again on her serve to help her dictate the points and she eases her way past the American to take the lead in the deciding set.

Keys shows signs that her confidence in growing in the match as she eases her way to levelling the decider with a love service game. The 20-year-old dicates every point in the game as the Pole has no answer for her power, especially on her forehand where she earns three of her points.

An important hold by Radwanska as the momentum appeared to be shifting towards the 20-year-old, but she stops the tide with a relatively simple win on her service game. The Pole finds her rhythm on her serve to knock the American to the baseline and then manouevres her around the court with an array of powerful forehands to secure the win.

Keys hits backs with a hold of her own as Radwanska's return skills have dropped in the past 20 minutes. The American's serve was under pressure in the first, but since the middle of the second, the Pole has been unable to register much resistance. Keys secures the game relatively quickly to tie the set a 2-2. The match is very much in the balance at the moment as neither player looks to be faltering on serve.

Radwanska races into a 30-0 lead as the game looks to be following a similar pattern as the rest in the set, but the American hits back as she finally produces a solid return game before firing two forehand winners to tie the game at 30-30. Keys lets Radwanska earn a game point with a loose forehand into the net, and she would come to regret that as the Pole produces a fine backhand down the line to repel a fierce baseline drive from the 20-year-old to seal the game. A good contest in that game.

Keys continues to be untouchable on her serve as she earns a 30-0 with a forehand winner and an ace down the 'T'. However, Radwanska sticks around and carves out a foothold in the game with a fine lob over the American at the net, but then hands the advantage back to the 20-year-old with loose forehand into the net before Keys serves out for the win.

The Pole shows sign of toil on her serve as the 20-year-old forces her way into the game with a couple of fine winners across the court as she works the 26-year-old one way then the other. Keys goes wide with her backhand at 30-30 to hand Radwanska a game point, but the American then produces one of the shots of the match as her forehand clips the corner of the baseline. The Pole is forced to dig deep to fend off the challenge of the 20-year-old and manages to carve out an advantage, which is taken when Keys goes long with her attempted forehand winner. A good battle here!

BREAK! A huge moment in the game as Radwanska breaks. Radwanska hits back at Keys with a forehand winner and the pressure looks to tell on the 20-year-old as she double faults to hand the Pole a 30-0 lead. The 26-year-old wastes her momentum with a loose forehand, but then plays the point of her match to earn two break points as she somehow lunges to lob the American at the net despite her powerful backhand, and then wins the point with a delicate slice across court. Radwanska has Keys on the back foot for the first break, but the American capitalises on a mistake with an overhead smash to save one point. However, Keys commits a forehand error to hand the break to the Pole. A huge moment in the game and Keys had looked so composed on her serve before that game.

GAME, SET, MATCH! Radwasnska serves out to claim the win and book her place in the semi-finals. Radwanska takes an early lead with a forehand winner, but a mistake brings Keys back into the point. However, the Pole takes charge of the game with an overhead smash and then an error on Keys' forehand brings up two match points. The first is spurned as her backhand crashes into the net, but she does not waste the second as her serve puts the American wide of the court and she then reverses the 20-year-old with a forehand winner to book her place in the last four.

Radwanska advances to the last four of the competition as she seizes the initiative at the right moment to earn the break of the American and she held her nerve to serve out under immense pressure. It was an excellent match between the duo, but the Pole's experience proved to be the telling factor in her victory. Radwanska will now play Garbine Muguruza in the semi-finals.

Thanks for joining our commentary this evening. Be sure to stick with Sports Mole for our coverage of Wimbledon for the rest of the week, but for now, it's goodbye.