Celine Boutier recorded a birdie on the ninth play-off hole to defeat Thailand's Atthaya Thitikul at the Maybank Championship in Malaysia.
After battling through eight holes and weathering the storm of a 90-minute storm delay, Boutier sank a six-foot putt at the Kuala Lumpur Golf and Country Club course to clinch her fourth title of the season and sixth in her career.
The nine-hole play-off tied the record for second-longest in LPGA Tour history.
"Yeah, I didn't expect it to be that long, to be honest," said Boutier, whocarded a bogey-free round to finish at 8-under-par 64 on Sunday and 21-under for the tournament.
The 29-year-old Frenchwoman highlighted her stretchwith birdies on holes 3-5 and 11-13 en route to pocketing $450,000 for her first-place finish.
"I was just trying to do my best each hole and each time I had an opportunity to have a play-off, and I feel like we were both very close to winning a few times, and I just feel like we just had to make a birdie, essentially," Boutier said.
"I knew she wasn't going to make a mistake, so I had to go for it and give myself the best chances for birdies. I feel like she's an amazing player, and so I feel like it was definitely nerve-racking, but I just feel very happy to have held on for that long."
Thitikul birdied the 18th hole to finish with a 68 on Sunday.
As for the play-off, she said: "It's exhausting. It's like -- it's pretty tiring, to be honest. But I think it's the best play-off I ever had in my life. Even if I lose, but I feel like, oh, damn, we played so good," she said.
"I feel a lot more confident with my game now. I fought really hard on the playoff, and both of us are hitting really great shots and it paid off. It just goes to someone who did it better."
Irish duo Stephanie Meadow and Leona Maguire, tied overnight, carded closing rounds of 70 and 72 respectively, the Ulster woman squeezing into the top-20 on 10-under par.
Maguire's eight-under par finish saw her place tied-34th.
Rookie sensation Rose Zhang, who held a one-stroke lead heading into the final round, carded a 71 on Sunday to end up in a tie for third place at 19-under with Thailand's Jasmine Suwannapura (70).
Peiyun Chien (68) of Taiwan was fifth at 18-under 270, while Nelly Korda (66) and Canadian Brooke Henderson (66) finished tied for sixth at 17-under.
