American Billy Horschel has never been afraid to stand out on the golf course.
But after claiming the US PGA Tour Championship and the season-long FedEx Cup, his game is finally speaking louder than his pants.
The 27-year-old - who was resplendent in multi coloured plaid on Sunday, a step down from his usual octopus prints - put an exclamation mark on a sensational playoff run at East Lake Golf Club.
After missing the cut in the first of four playoff events Horschel finished tied for second in week two and then won back-to-back events to claim the season-long points race for the FedEx Cup and the $US10 million ($A10.82 million) bonus.
A final round two-under 68, his 12th straight round in the 60s, left him 11 under par for the week in Atlanta, three clear of his nearest challengers in world No.1 Rory McIlroy (71) and American veteran Jim Furyk (69), who finished eight under.
By adding the $US1,440,000 ($A1.56 million) winners cheque from East Lake and the $US10 million ($A10.82 million) bonus, Horschel walks away with $US13,477,333.33 ($A14.58 million) for his last three weeks of work.
"I'm on cloud nine. It's unbelievable," Horschel, who was ranked 82nd on the points list after the first playoff said.
"The year I had, I wasn't sure this was going to happen, but I kept believing, everyone on my team kept believing in me and just kept my head up high.
"I'm a positive guy, I always see things glass half full, and it turned out for the best, and I can't be more thrilled."
Australian Jason Day (69) joined Justin Rose (69) and Chris Kirk (68) in a tie for fourth at seven under.
Day, who started just three back and was within two of the lead early, faded in the middle of the round before two late birdies ensured a high finish.
"I finished strong today, which was nice to get myself to fourth," Day said.
"Given my injuries this week and others I'm very encouraged with how I played this year."
McIlroy, co-leader with Horschel overnight, went into the final round as favourite but after relinquishing his share of the lead on the fifth hole he dumped his tee ball in the water on the par three sixth and took a double bogey, making his claim for the big money an uphill battle.
"I just got really frustrated and just couldn't muster the energy to try and get something going again," McIlroy said.
"And even when I was hitting good shots, I was hitting bad putts."
Furyk was within one with two holes to play but finished with two bogies to end his charge.
World No.2 Adam Scott (70) finished in a tie for ninth at four under.
John Senden ended the event with a four-over 74 to be 10 over for the week and 26th while Geoff Ogilvy (73) finished last in the 29-man field at 20-over.
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