Baddeley shot a closing three-under 69 to finish one shot outside an all-American playoff involving overnight leader Brandt Snedeker (74), Ryan Moore (67) and Tway (71) who were tied at 14 under.

Tway, the 30-year-old son of Greg Norman's 1986 US PGA Championship nemesis Bob Tway, triumphed from Moore with a 10-foot birdie putt at the third play-off hole after Snedeker was eliminated at the first.

"In the playoff I made three birdies, so that was pretty good," Tway said, after capping off his win on the 10th hole at the Silverado resort in California's Napa Valley.

"I'm kind of at a loss for words."

Baddeley, 37, could not quite add to his four victories but added US$241,280 (AU$342,000) to his US$20,543,617 in career earnings while some younger countrymen also impressed.

RIGHT: Tway overcame Snedeker and Moore to win his first title on the PGA Tour. PHOTO: Robert Laberge/Getty Images.

Making his debut as a fulltime PGA Tour member, Sydney's Australian Open champion Cameron Davis tied for 17th after a closing 68, earning a US$80,960 (AU$115,000) pay day.

Countryman Brett Drewitt (71) was rewarded with US$46,800 (AU$66,000) in prizemoney after putting his honeymoon on hold to get in through qualifying before finishing tied 25th.

Already signed as a drawcard at next month's Australian Open, Snedeker lamented a badly blown chance for a 10th US tour title.

He led by as many as five shots before three straight bogeys from the turn and another at the 17th cruelled his round.

"No one to blame but myself.. I have to find a way to win today," Snedeker tweeted.

"Can't wait to tee it up next week in Malaysia.. Not going to let 9 bad holes make me forget about the other 63..I am going to get that 10th win soon!! Thanks for all the support, don't deserve it after that junk!!"