Phil Mickelson has held onto his lead at the Phoenix Open following the second round of play in Scottsdale, Arizona.
The American led the chasing pack by four shots at the end of day one thanks to his course record-equalling score of 60.
Despite a round of 65 on Friday, Mickelson remains four shots ahead of fellow countryman Bill Haas on 17-under-par.
Former PGA Champion Keegan Bradley is on 12-under with Brandt Snedeker, while Argentinian Angel Cabrera, South Korea's Charlie Wi and another American, Brian Gay, finished the day on 11-under.
