Brooks Koepka is the new World No.1 after winning the PGA Tour's CJ Cup at Nine Bridges by four strokes in South Korea.
Koepka, who displaces Dustin Johnson for the world's top ranking, shot a final-round eight-under-par 64 for a 21-under total of 267, triumphing from fast-finishing fellow American Gary Woodland (63).
The 28-year-old's rise to No.1 for the first time caps a stellar year in which he also won his second US Open title and claimed his third major title at the US PGA Championship.
"Everything I've done this year it's been working. So I don't want to change anything," Koepka said. "Just keep improving.
"I'm so excited right now, you have no idea. I can't wait to go play again."
The Australian contingent finished with a flourish to collect big cheques but never threatened the winner.
Jason Day shot 67 to tie for fifth, a distant nine shots behind Koepka, while Cameron Smith (69) tied for seventh and Adam Scott rattled home with a 64 to tie for 10th.
Marc Leishman rediscovered some of the form that brought him victory on the Tour last Sunday as he shot a 66 to be tied 18th.
RIGHT: Koepka celebrates after winning the CJ Cup at Nine Bridges. PHOTO: JUNG YEON-JE/AFP/Getty Images.
Koepka led by four strokes after three rounds but Woodland certainly made it interesting, pulling level after making six birdies in seven holes on the front nine.
The two dueled on the back nine, with Woodland birdieing 15 and 16 to again pull level. But Koepka did the same, and a bogey by Woodland on the par-3 17th gave Koepka the cushion he needed to close out the win despite a birdie on the 18th by Woodland.
Koepka is the third player this year to reach No.1 for the first time, joining Justin Rose and Justin Thomas.
The last time that happened was in 1997, when Ernie Els, Tom Lehman and Tiger Woods each rose to No.1.
It was Koepka's 12th victory worldwide, including four wins on the European Challenge Tour. He now has won in six countries – the US, South Korea, Spain, Italy, Turkey and Scotland.
He will play again this week when the PGA Tour heads to Shanghai for the final stop on its Asian swing; the World Golf Championships-HSBC Champions.