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

Making his sixth career start on the tour, 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.

“I got a pretty good read off Phil’s putt,” Long said. “It was one of those putts that you just stand over you just know you’re going to make. And you can’t control that, but when you have that feeling it’s a good one. I’m in pretty disbelief right now. I don’t really know what happened.”

Mickelson, the leader after each of the first three rounds, fought putting problems in a 69. His 40-foot birdie try on 18 curled left at the end.

Long set up with the winning putt 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.