Bryce Molder edged out Briny Baird in a play-off to earn his first PGA Tour win at the Frys.com Open, after Englishman Paul Casey fell away on the final day.
Casey started the day in a tie for second, but a final-round 71, including three bogeys and a double bogey, saw him finish joint seventh on 11 under.
Molder chased down overnight leader Baird to finish tied on 17 under, winning on the sixth extra hole.
Tiger Woods finished in a tie for 30th after his third successive round of 68.
It was an encouraging return to the tour after two months out for the former world number one, although his day was marred somewhat when a spectator threw a hot-dog at him and was arrested.
Baird, too, will have mixed feelings on a day that saw him allow a two-shot overnight lead slip.
The American has now not won in more than 12 years and 348 starts on the PGA Tour - although he has made more money than any player without a victory, with just over $11.9m (£7.65m) in career earnings.
"I finished second before four times, and only one of those four times did I really honestly think I had a chance to win," he said afterwards. "Today I felt like I was out there to win the tournament. For me, that's a big deal."
Molder added: "It's a little surreal right now. That's a lot of golf today."
Bud Cauley made it an all-American top three as he finished on 15 under, a shot ahead of countryman Shane Bertsch and South African Ernie Els.