Kevin Tway hit three consecutive birdies in the play-off to seal his first PGA Tour title at the Safeway Open in California.
Tway, the son of 1986 PGA Championship winner Bob, was in a three-way race for the title after going around in 71 in the final day and finishing on 14-under alongside compatriots Ryan Moore and Brandt Snedeker.
Snedeker could only manage par on the first playoff hole, the 18th, while Moore and Tway both hit birdies on the first two playoff holes.
The title was decided at the 10th, Tway carding a three on the par-4 for the win.
Snedeker went into the final round with a three-shot lead but had a torrid back-nine in which he dropped four shots to go around in 74.
Conversely, Moore played himself into contention with a round of 67 having started the day seven shots off the lead.
Martin Laird was the highest placed Briton but fell 31 places to joint 46th with a round of 76, including a double bogey on the par-3 second.