US teenager Lexi Thompson birdied the final hole on Sunday to beat Stacy Lewis by one stroke in the US LPGA's Lorena Ochoa Invitational in Mexico.
Lewis had a chance to force a playoff but missed her birdie attempt.
Thompson, 18, notched her third LPGA tour title. She had claimed her second in Malaysia last month, ending the two-year dry-spell since her first triumph in 2011 when she was 16.
Thompson had four birdies and one bogey in a three-under-par 69 at Guadalajara Country Club, and finished with a 16-under total of 272.
Lewis was alone in second after a 68 for 273 and South Korea's Ryu So-Yeon was third after a 69 for 275.
South Korea's world No.1 Park In-Bee wrapped up LPGA player of the year honours with her fourth-placed finish, firing a 69 for 277.
The only player who had a slim chance to catch her for the points-based award over the final two events of the season was Norway's Suzann Pettersen, who finished tied with Thailand's Pornanong Phatlum on 278.
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