Holmes (70) was the only player in the final group to shoot under par during a windy final round and he won at 14-under 270 as third-round leader Thomas (75) and Scott (76, eight under) fell back at Riviera Country Club.

The final trio played 34 holes on Sunday with almost an entire day's play lost at the start of the tournament due to heavy rain on Thursday.

Leishman (68) made a charge before two late bogeys sank his title chances and he finished a good week tied with Rory McIlroy (69) at 11 under, one shot behind third-placed Si Woo Kim (66).

In search of his first victory in almost three years, Scott pulled within one shot of then leader Thomas after the 7th hole.

But a nightmare run of poor driving and putting saw him plummet from contention.

Scott missed six consecutive putts on Sunday within 10 feet of the hole, starting at the par-4 8th – which he bogeyed.

RIGHT: Scott hit six of 14 fairways during the windy final round of the Genesis Open. PHOTO: Teck Lim/Getty Images.

The former World No.1 bogeyed again at the 9th before four more on the back nine ruled him out of the race.

The 38-year-old hit just six of 14 fairways in the final round.

"It was very difficult; you just have to kind of be on with everything and the last 11 holes, I drove it poorly and I putted poorly," Scott said.

"It's easy to bleed shots and that's what I did."

Tiger Woods was among those who struggled on Sunday. His 72 dropped him to six-under the card after the 14-time major winner rocketed into contention with a third-round 65.

Australians Aaron Baddeley and Cameron Smith signed for rounds of 73 and 74 respectively to both finish at even par.

- Evin Priest, Australian Associated Press