Lucas Glover beat Jonathan Byrd in a play-off to claim victory in the Wells Fargo Championship at Quail Hollow in Charlotte.
The American held his nerve with a par-four on the only extra hole needed to see off his close friend and win his first tournament since his 2009 US Open triumph.
The players had been tied at 15 under at the end of play. Glover – who had started the day in joint-third – sank four birdies and an eagle on the par-five 10th to climb the leaderboard with a final round of 69.
Overnight leader Byrd could only manage a level-par 72 in his final round, but a 14-foot putt on the 18th hole secured one of four birdies on his scorecard and allowed him to pull level with Glover.
The players then returned to the 18th to begin the play-off, but Byrd put his drive into the bunker while Glover found the green with little effort, closing out for victory with a two-foot putt.
Rory Sabbatini impressed with a blemish-free seven-under 65 on the final day to finish third on 14 under overall, one shot ahead of local boy Bill Haas, who rounded off his tournament with a two-under 70.
Kevin Na claimed a fifth-placed finish with a final round of 71, with Zach Johnson, Bobby Gates and Pat Perez tied for sixth on 11 under.
Padraig Harrington was the leading European, joining Phil Mickelson on 10 under for the tournament and a share of ninth place.
The Irishman holed six birdies but dropped shots on the final two holes to go round in 68.
Mickelson had three bogeys on the back nine to drop off the pace and complete the round in three-under 69.