Bill Haas held his nerve to beat fellow American Hunter Mahan in a thrilling playoff for the US PGA golf competiton's season-ending Tour Championship in Atlanta, also claiming FedExCup honours with its $10 million bonus.
Haas coolly knocked in a four-foot par putt at the third extra hole at East Lake Golf Club, the par-three last, to seal victory after Mahan had bogeyed after hitting his tee shot into a greenside bunker and splashing out 15 feet beyond the cup.
The pair had finished the 72 regulation holes on eight-under-par 272, Haas closing with a two-under 68 and joint overnight leader Mahan carding a 71.
British world number one Luke Donald birdied three of the last five holes for a 69 to finish in a tie for third with South Korean K.J. Choi (70) and Australian Aaron Baddeley (72).