Bill Haas clinched the FedEx Cup after beating Hunter Mahan in a play-off at the Tour Championship in Atlanta.
The pair were level on eight under after 18 and then traded pars on the first two extra holes before Haas parred the third as Mahan made bogey.
Luke Donald, runner-up last year, finished third in the race for the $10m prize after a one-under-par 69 to end on seven under.
Donald tied for third in the Atlanta event with Aaron Baddeley and KJ Choi.
Donald carded four birdies, including a two on the last, but fives on four, 10 and 12 checked his progress.
He said: “Every shot counts, especially in this last tournament. At least I gave myself a chance with that birdie at the last.”
The world number one earns a $1.8m prize for his efforts but winner Haas takes home $11.4m for clinching the season-ending Tour Championship as well as the FedEx Cup.
The 29-year-old had looked to have blown his chances of victory at the second play-off hole.
He found a bunker with his tee shot and then water with his second, but a shallow enough lie allowed him to play the ball from its resting place and he superbly pitched to within three feet and halved the hole in four. It was a fantastic shot under immense pressue
Mahan found the greenside bunker in the third play-off hole and then allowed his escape to run a good 15 feet past the hole.
Haas, putting from the back fringe of the green, rolled his ball just four feet past and, after Mahan missed, he found the centre of the cup to clinch the win.