Inbee Park of South Korea took advantage of overnight leader Ariya Jutanugarn's triple bogey on the last hole Sunday to secure a one-stroke victory in the LPGA Thailand.
Jutanugarn blew a two-stroke lead on the 18th when she first had to take a drop and then missed a three-foot putt to force a playoff. The 17-year-old Thai golfer was moved to tears as the putt lipped out, while a surprised Park started celebrating in the clubhouse with her caddie.
The fourth-ranked Park finished with a 67 for a 12-under 276 total, with Jutanugarn a shot back after a 72.
Top-ranked Yani Tseng of Taiwan shot a final-round 63 to finish another stroke back in joint third with Beatriz Recari of Spain (70) and So Yeon Ryu of South Korea (68).