Berger, who started the day two strokes off the lead, wasted little time getting going in the final round with an eagle on the 2nd hole and capped off his seven-under 65 by holing a 30-foot putt on the par-5 18th for another eagle.

Berger, with a total of 18-under-par 270, won for the second time since the PGA Tour returned to golf from the COVID-19 pandemic last year and for the fourth time overall.

This was another wild chase on a crisp, breezy day at the iconic California course, and Jordan Spieth (70) went from leading to lagging as he tied for third at 15 under along with Patrick Cantlay (68).

Maverick McNealy made five birdies on his closing eight holes for a 66 to finish second.

Berger was in the group behind him, and fired a fairway metal into the heart of the 18th green, 30 feet away.

RIGHT: Jason Day finished five shots behind Berger to share seventh place. PHOTO: Steph Chambers/Getty Images.

He only needed two putts for birdie to win, and instead finished with a flair.

"That was the best putt I've ever hit in my life," Berger said.

Spieth finished in the top four for the second week in a row, a strong sign that his game is coming back after a drought that dates to his 2017 Open Championship victory at Royal Birkdale.

Australian star Day started Sunday's play three shots off the pace but a charge never materialised from the former World No.1, who has not won an event since May 2018.

Two front-nine birdies and two more on his way home, after a bogey on the 12th, gave Day a 69 to finish at 13-under and five shots behind Berger.

Cameron Davis was next best of the Aussies with a final round 68 lifting him to a share 14th while Cameron Percy (70, tied-21st), Matt Jones (71, tied-34th) and John Senden (73, tied-39th) also collected pay cheques.