Cameron Champ held off a surging Adam Hadwin to claim the Safeway Open by one shot in a thrilling finale.
Hadwin birdied three consecutive holes to close out his final round to take a share of the lead in Napa, California on Sunday.
However, Champ holed a three-foot, eight-inch birdie putt at the 18th to claim his second PGA Tour title.
Champ carded his fourth consecutive round in the 60's — a three-under-par 69 in the final day of play — to finish 17 under, ahead of Hadwin, who finished in second (16 under) at Silverado Country Club.
Champ was seeking his first Tour victory since taking out last year's Sanderson Farms Championship. He carried a three-stroke lead into the final day.
The eventual victory put him in a unique category. Champ became the first player to win in the fall portion of back-to-back seasons since Justin Thomas and Brendan Steele completed the feat in the fall of 2016 and 2017.
He birdied four holes on the front nine — his only blemish a bogey at the par-4 8th — before dropping the 17th but regrouping with a title-sealing birdie.
Hadwin, who was three shots off the pace at the start of the day, recorded eight birdies and three bogeys as he pushed Champ to the limit.
Marc Leishman finished outright third (14 under) thanks to his seven-under-par 65 and a shot ahead of the fourth-place trio Charles Howell III, Zac Blair and Justin Thomas who all finished the weekend at 13 under.
Thomas, the winner of the 2017 FedEx Cup and PGA Championship, had to settle for the tie following four birdies and a bogey.
Bryson DeChambeau held the lead at the halfway stage of the tournament, however, the five-time PGA Tour champion finished tied for 13th (10 under) after back-to-back rounds in the 70's.