Luke Donald produced a stunning back nine to shoot 64 at the Children's Miracle Network Classic to claim a two-shot victory and leapfrog Webb Simpson at the summit of the PGA Tour money list.
The Englishman only entered the final event of the PGA Tour season on Monday after Simpson overtook him in the money list by finishing second in last week's McGladrey Classic.
Donald knew he needed a top two to finish as PGA Tour number one and it didn't look possible as he started the day in tied 14th and five shots off the lead. As he turned in two under par it looked like his race was run, but then he produced a world class run worthy of his number one position in the world rankings.
He birdied the next six holes to carve through the field and leap to the top of the leaderboard. He made three pars on the tough closing three holes and no one in the groups behind him were able to equal his -17 total.
Simpson - who played seven more PGA Tour events than Donald - had a good week but had to settle for tied sixth after a closing 69.
"What better time to go on a run than the back nine on Sunday. It's nice to do it under pressure when I needed to. I'm thrilled and over the moon."
Donald is now on course to be the first player in history to top the PGA and European Tour money lists in the same season and is strong favourite to be named PGA Tour Player of the Year.