Tiger Woods won the American Express Championship in Atlanta on Sunday - his eighth World Golf Championship title in 15 starts.
The world number one and defending champion bogeyed the last two holes and shot a closing two-over-par 72 to finish on six under.
But that was still good enough for a two-shot victory over Australian Stuart Appleby, American Tim Herron and Fiji's Vijay Singh.
The win, his fifth of the year, takes Woods back to the top of the US Tour money list.
The victory was also the 100th for New Zealand caddie Steve Williams.
"People have no idea how big this win is," said Woods.
"I've been trying all summer to get him to 100. He has meant a lot to the success I've had."
Ireland's Padraig Harrington birdied the last three holes for a 66 and joint sixth place, two ahead of Englishman Paul Casey.
"My game is getting back into shape," said Harrington.
"I worked hard on my mental game this week and overcame some of the tough mental challenges."
Darren Clarke finished in 38th place, which kept alive his hopes of winning the European Order of Merit title.
Clarke must win both the Madrid Open and Volvo Masters to pip Ernie Els to top spot.