Bubba Watson ended his big week in Los Angeles as the star of his own show Sunday at Riviera.

Two shots behind with four holes to play, Watson made two birdies to overtake Jason Kokrak and hold off Adam Scott for a one-shot victory in the Northern Trust Open.

Watson, who closed with a 3-under-par 68, won at Riviera for the second time in three years and moved back to No. 4 in the world.

He was among a half-dozen players who still had a chance over the back nine under warm sunshine. He took advantage of some late mistakes by Kokrak, who was going for his first PGA Tour victory, and his two birdies were enough to turn back the late heroics of Scott, who chipped in for birdie on the 18th for a 67.

That group of contenders did not include Rory McIlroy. In his Riviera debut, McIlroy made eagle on the par-5 first hole to tie for the lead. But he didn’t make a birdie until the 18th, giving him a 75 to tie for 20th.

Watson, Scott, Kokrak, and K.J. Choi were tied for the lead with 11 holes remaining, and all of them dropped shots to fall out of the lead.

‘‘For me to come back . . . and pull one out in a tough way means a lot,’’ Watson said.

He finished at 15-under 269 for his ninth career victory on the PGA Tour.

Kokrak had the lead to himself when Choi made bogey on No. 12, Scott missed 5-foot par putts on the 14th and 15th holes, and Watson went long of the 13th hole and watched his 20-foot par putt spin out of the cup.

But what a week for Watson. He took his 3-year-old son to hang out with Justin Bieber, made a cameo appearance in a ‘‘Girl Meets World’’ episode, and hung out with his pals at the Los Angeles Clippers-Golden State Warriors game Saturday night.

Best of all was winning another tournament.

European — Australian Marcus Fraser made a curling 18-foot putt for par on the final hole for a 3-under 68 to win the inaugural Maybank Championship Malaysia in Kuala Lumpur by two strokes over Lee Soo-min.

Fraser trailed third-round leader Lee throughout the final round at Royal Selangor Golf Club before taking advantage of Lee’s late collapse to claim his third European Tour victory in the event, which was co-sanctioned with the Asian Tour.

The 37-year-old Australian, who ended a six-year title drought, finished with a 15-under total of 269.

Lee closed with a 73 and was tied for second with Miguel Tabuena of the Philippines, who shot a final-round 68.

Former British Open champion Louis Oosthuizen shot a closing 66 and finished seven strokes behind.

LPGA — Honolulu-based Haru Nomura of Japan won her first tournament in her 72d start, shooting a closing 7-under 65 to win the Women’s Australian Open by three strokes in Adelaide.

Nomura, who was tied for the lead with two others going into the final round at Grange’s West, finished with a 16-under total of 272.

Top-ranked and defending champion Lydia Ko, who trailed by a stroke after three rounds, finished second after shooting a 67.

Five-time champion Karrie Webb shot 71 to finish third, seven strokes off the lead. American Danielle Kang was tied for fourth after shooting a 73, eight strokes behind.