The battle for Tour Championship and FedExCup golf honours remained wide open after American Jim Furyk grabbed a slender one-shot lead after the third round in Atlanta.
Joint pacesetter overnight with playing partner Luke Donald of Britain, Furyk carded a level-par 70 on another hot and humid day for an eight-under total of 202 in the PGA Tour's final playoff event.
Donald, who twice edged a stroke in front of the American over the front nine, surrendered the lead with an ugly double-bogey at the par-five 15th on the way to a 71.
That left him in a tie for second place with 2004 champion Retief Goosen of South Africa, who birdied three of the last seven holes for a 66.
Australian Geoff Ogilvy, who barely slept overnight after watching television coverage of his beloved St Kilda team in the Australian Football League Grand Final, was fourth at five under after a 72.
FedExCup points leader Matt Kuchar, who could finish as low as 29th this week and still have a chance of landing playoff honours, was tied for 23rd at four over after a 72.
Tee times for the final round have been brought forward by almost three hours with widespread showers and thunderstorms forecast in the area.