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Humble, Texas • Hunter Mahan shot a 1-under 71 on Sunday to win the Houston Open, edging Carl Pettersson by one stroke.

Mahan, who won the Match Play Championship in February, is the first two-time champion on the PGA Tour this year. The victory moved Mahan up to No. 4 in the world rankings, the first time he's ever been the highest-ranked American.

"That's a pretty surreal thing to think about," Mahan said. "It shows me what I can do, shows me what I'm capable of."

Pettersson (71) finished with eight pars for his second runner-up finish this year. Third-round leader Louis Oosthuizen (75) was another shot back at 14 under.

The 29-year-old Mahan began the day two shots behind Oosthuizen, who lost the lead with two double bogeys on his front nine. Mahan earned his fifth career victory. He has six top-25 finishes in seven starts this year.

Standing on the 18th tee with a one-stroke lead, Mahan confidently hit his tee shot down the middle of the fairway, then knocked his 203-yard approach to 21 feet.

Defending champion Phil Mickelson (71), Keegan Bradley (71), Brian Davis (74) and Jeff Overton (68) all finished 12 under.

LPGA Tour

In Rancho Mirage, Calif., Sun Young Yoo won the Kraft Nabisco Championship with an 18-foot birdie putt on the first playoff hole, earning her first major title after I.K. Kim missed a 1-foot putt on the final hole of regulation.

Yoo won the LPGA Tour's first major of the season with steady play down the stretch, but she got to make the traditional leap into Poppie's Pond only after Kim's mind-boggling miss on the same green minutes earlier.

Yoo and Kim finished at 9 under.