Koepka charged into the reckoning with a final-round seven-under 63 and went on to claim his second win of the year in the league. 

Former world No.1 Rahm, who lost a four-shot lead on the back nine at the Olympics two weeks ago, started the day with a two-shot lead and closed with a 65. 

He birdied two of his last three holes to match Koepka at 19-under 191 and force the play-off.

Koepka went on to make par at the first play-off hole, and Rahm had a long par putt to extend the match, but it kissed the right edge of the cup and lipped out.

Koepka had double the reason to celebrate because his team, Smash GC, took home the team title by three shots over the all-Australian Ripper GC, captained by Cameron Smith. 

Koepka, Talor Gooch, Jason Kokrak and Northern Ireland’s Graeme McDowell combined to go 18 under par on Sunday, pushing their three-day total to 53-under.

Marc Leishman did best of the Australians individually, finishing tied fourth, two shots outside the play-off, with Lucas Herbert two shots further back in a tie for sixth.

Former Open champion Smith tied for eighth at 14-under while fellow Aussie Matt Jones tied 20th at 10-under.

Koepka relished his duel with Rahm.

“For whatever reason, he’s always got the better of me a little bit as of late. So it feels nice just to get one,” he said.

The two play-off participants have seven major championships between them, with Koepka owning five. 

But Rahm got the best of Koepka in a head-to-head battle down the stretch at the 2023 Masters, before Rahm left the PGA Tour for LIV.

“I wasn’t thinking about it,” Koepka said. “It was just one of those things, just go play golf and go get it in the hole as quickly as possible.”