Guadalajara, Mexico (SportsNetwork.com) - Lexi Thompson birdied the final hole on Sunday to earn a 1-stroke victory over Stacy Lewis at the Lorena Ochoa Invitational.
Thompson's birdie closed out a 3-under 69, as the 18-year-old claimed her second LPGA Tour victory of the season and third of her career at 16-under-par 272.
Lewis (68) had a chance to force a playoff, but failed to convert her short birdie effort on the 72nd hole at Guadalajara Country Club to end one shot off the pace at 15-under.
So Yeon Ryu (69) finished alone in third place at 13-under, while Inbee Park (69) captured fourth at 11-under 277.
Suzann Pettersen (70) and Pornanong Phatlum (71) shared fifth at minus-10.
Thompson and Lewis entered the final hole tied at 15-under after Lewis bogeyed the 17th, and both saw their third shot at the par-5 closing hole settle five feet from the pin.
Thompson was the first to attempt her putt and she calmly drained the effort to put the pressure on Lewis. Needing to also hole her putt to force a playoff, the British Open winner saw her birdie putt roll past the hole to hand Thompson the title.
"It all came down to thinking I can make it and (I) went up to it confidently," said Thompson. "Just knock it in."
Thompson had earlier parred her first six holes to maintain her 1-stroke advantage before a birdie at the seventh moved her two clear of Lewis, who birdied the first to move to 12-under.
Lewis pulled back within a shot of the lead with a birdie at the eighth, but Thompson answered with a gain at the ninth to reclaim her 2-stroke cushion.
After Thompson and Lewis both birdied the 10th, Lewis tripped to a bogey at the 11th to drop back to 13-under and hand Thompson a 3-stroke lead.
A 2-stroke swing at the 12th, however, dropped Thompson's lead back to just one, as Thompson bogeyed the hole to drop to 15-under and Lewis converted her birdie effort to again reach minus-14.
Lewis birdied Nos. 13 and 14 to claim the outright lead at 16-under, but later bogeyed the 17th to fall into a tie with Thompson entering the decisive final hole.
"Stacy is an amazing player," said Thompson. "I knew she could make a run at me any time during that round. When she made the two shot swing on me, I think on number 12, it brought it back to all squared. I knew I had to make birdies on top of her because she gets on a roll and she doesn't stop."
NOTES: Thompson's other victory this season came at the Sime Darby LPGA Malaysia ... Thompson joined Lewis, Park, Pettersen, and Beatriz Recari as the only multiple winners this season ... The LPGA concludes its season next week with the CME Group Titleholders, where Na Yeon Choi will defend her title.