American DeChambeau finished with an eight-under 63 at Rich Harvest Farms and a 54-hole total of 13-under 200.

It was the second win of the season on the LIV Golf League for DeChambeau, whose Crushers GC – including Lahiri – won the team competition by three shots. That means DeChambeau takes home $US5.25 million ($A8.14m) – $US4 million for the individual trophy.

DeChambeau closed with a 12-under 58 to win at The Greenbrier in early August.

“I would say the most consistently good golf of my life. I don't know if it's the top-notch but definitely when I shot 58 that was probably the best golf I've ever played,” DeChambeau said following his win.

“Yeah, I knew this golf course was gettable. I knew that I could have the chance to go low, just with the way I'm driving it and hitting it, putting it, as well.

Aussie Marc Leishman finished one shot back of DeChambeau chasing his first LIV Golf win. PHOTO: Quinn Harris/Getty Images.

“It just felt like such a unique week because it wasn't like I putted super great or hit it really great, I just kept it in play and hit it in the right places, and I feel like I took advantage when I needed to.

Leishman shot 66. Lahiri, who started on the 1st hole in the final pairing with second round leader Sebastian Munoz, bogeyed the par-4 18th to fall out of a tie with DeChambeau.

“Just really enjoying the golf at the moment,” Leishman said. “Happy with the week.”

Munoz, who led by three after 36 holes, closed with a 73.

“I wanted to be in a play-off with Ban. He's worked his butt off all year, and look, I couldn't be happier that I won, but I feel so bad for Ban,” DeChambeau said about his Crushers GC teammate.

“I would say the most consistently good golf of my life. I don't know if it's the top-notch but definitely when I shot 58 that was probably the best golf I've ever played." – Bryson DeChambeau.

“I wanted to go into a play-off and battle it out with my brother. I love him to death. He's a grinder.”

Matt Jones was next-best Australian after Leishman, shooting a 69 to be tied 28th at four-under, while Jed Morgan (72, even-par) and Cameron Smith (73, even-par) were well back.

Brooks Koepka – playing his final tournament before the Ryder Cup in Italy – shot 71 to finish at five-under. Koepka, who won the PGA Championship in May and was picked on the U.S team by captain Zach Johnson, will be the only LIV player participating in the biennial team competition.

There are two events remaining on LIV's 2024 schedule, next month in Saudi Arabia and at Trump National Doral in Florida.