Record breaker Kim Hyo-joo said her round of 61 at The Evian Championship came about thanks to some "good luck".
South Korea's Kim carded the lowest round of any man or woman at a golf major, with her 10-under-par effort sending her four shots clear at the Evian Resort Golf Club on Thursday.
Kim said while the course played difficult, she still managed to make 10 birdies.
"I feel it's very hard to play, but I think I have good luck, so I had better score," the teenager said.
Kim was in a jovial mood after her stunning round, and said she was lapping up her time at the major - literally.
"I think I Evian is the expensive water, so I feel good about that, drink expensive water," she said.
"In Korea, Evian is expensive water. I drink two or three here."
Closest to Kim is Australia's seven-time major winner Karrie Webb.
Webb last won a major in 2006 at the Kraft Nabisco Championship, but the 39-year-old said she delved even further back into her experience to pull out a six-under-par 65.
"[I was] pretty solid to the green and I rolled the ball really nicely. Probably the best I putted for a long time," she said.
"Switched to an old putter I used about 12 years ago. Went for a more simple look, and the ball started going in today."
Webb said she would be pleased to be in the hunt down the stretch in Evian-les-Bains.
"Well, any time you're in the hunt at any tournament it's what you work for still," she said.
"Obviously a major, and the last major of the year.
"We don't get to play another major for a couple months, so it would be great to have a chance coming down 18 on Sunday."