Adam Long made a 14-foot birdie putt on the final hole Sunday to win the Desert Classic for his first PGA Tour title.

Long closed with a 7-under 65 on the Stadium Course at PGA West to beat playing partners Phil Mickelson and Adam Hadwin by a stroke.

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Adam Long waves after a birdie on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long waves after a birdie on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
Phil Mickelson watches his tee shot on the fifth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the fifth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
Adam Long hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
Adam Hadwin watches his putt on the fourth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin watches his putt on the fourth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
Adam Hadwin hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
Phil Mickelson watches his tee shot on the third hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the third hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
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Adam Long waves after a birdie on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long waves after a birdie on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the fifth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the fifth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin watches his putt on the fourth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin watches his putt on the fourth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the third hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the third hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Mickelson, the leader after each of the first three rounds, fought putting problems in a 69. Hadwin shot 67.

Adam Long waves after a birdie on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long waves after a birdie on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Long set up with the winning put with a 6-iron shot from 175 yards with the ball below his feet in dormant grass on a mound to the right of the fairway. The 31-year-old former Duke player earned his PGA Tour card with a 13th-place finish last year on the Web.com Tour's regular-season money list.

Long finished at 26-under 262. He opened with a 63 on PGA West's Nicklaus Tournament Course, shot 71 on Friday at the Stadium layout and had another 63 on Saturday at La Quinta Country Club.

Phil Mickelson watches his tee shot on the fifth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the fifth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

 Adam Long hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Long hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)
Adam Hadwin watches his putt on the fourth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin watches his putt on the fourth hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

 Adam Hadwin hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Adam Hadwin hits from the fairway on the second hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

 Phil Mickelson watches his tee shot on the third hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)

Phil Mickelson watches his tee shot on the third hole during the final round of the Desert Classic golf tournament on the Stadium Course at PGA West on Sunday, Jan. 20, 2019, in La Quinta, Calif. (AP PhotoChris Carlson)