Vaughn Taylor carded a final-round seven-under 65 to win the AT&T Pebble Beach Pro-Am by one stroke from Phil Mickelson.
Taylor sunk four straight birdies from the 13th to the 16th holes to put himself on top of the leaderboard, while Mickelson missed a birdie putt from five feet on the last that would have forced a play-off.
"It's been a long time. I didn't think it was going to happen," Taylor, who won his first PGA Tour event since 2005, told reporters. "I worked so hard. I kept getting knocked down, knocked down. I'm just at a loss for words."
Sweden's Jonas Blixt finished third after a three-under round of 69 with Freddie Jacobson and Hirshi Iwata sharing fourth place a shot further adrift.
Taylor went out in 34 but it was after the turn that he really upped his game.
He hit his approach to within three feet on the 13th and on the par-five 14th he hit to within 12 feet.
On the 15th his shot out of the rough struck the ball of Matt Jones and stopped just two foot short of the cup.
And then at 16th hole he sunk a 30-foot putt for a fourth straight birdie that saw him circle the green in delight.
He had two further opportunities for birdie on the closing two holes but did not take advantage.
Mickelson, though, did not make it easy for Taylor watching from the clubhouse as, trailing by two with two to play he made a 12-foot birdie on the 17th.
But he then missed from five feet on the final hole as the ball clipped the left edge of the cup and spun away.