Thailand's Patty Tavatanakit produced an impressive display of golf with a five-under 67 in the third round of the ANA Inspiration to storm five shots clear at the top of the leaderboard.
The 21-year-old, who is seeking her maiden LPGA Tour win in the opening major of the year, started the day with a one-shot advantage at Mission Hills Country Club.
But she quickly put daylight between herself and the rest of the field on another hot and windy day in California with birdies at the opening three holes before adding further gains at the ninth and 11th, where she smashed a 337-yard drive.
Tavatanakit's first bogey came at the par-four 12th but she put that behind her with birdies at the 13th and 15th, although she slipped up again with another bogey at the par-three 17th after finding a greenside bunker.
There was then almost a disastrous finish when her third shot at the par-five 18th was just inches short of spinning back into the water, but it remained dry and she managed to get up-and-down from there to finish on 14-under 202, equalling the tournament record after 54 holes.
Tavatanakit refused to dwell on her performance, in which she produced an excellent combination of power and touch, afterwards and quickly turned her attention to Sunday's final round.
"Today I'm going to leave it behind," she said. "It's a great day, acknowledged it, and it's in the past now. All I can think about is what can I do tomorrow, what can I improve from today's round? I was getting a little tired at the end. What can I do to keep my energy level up throughout the day tomorrow? That's going to be my goal.
"And just stay calm out there. I feel like I did that pretty well. And just have the golf, so whatever the outcome is I'll be really happy. It's been a good week so far."
American Ally Ewing went one better than Tavatanakit with a flawless six-under 66, which featured six birdies, to head the chasing pack on nine under alongside defending champion Mirim Lee of South Korea, whose 68 included two birdie hat-tricks from the second and 14th.
China's Shanshan Feng, who was one off the lead overnight, could only manage a level-par 72 to remain on eight under, while England's Charley Hull shares fifth place with Inbee Park (70) on seven under.
Hull's challenge was derailed early on with a triple-bogey seven at the third, but she also managed to make five birdies over the first 11 holes before a bogey at the last left her with a 71.
Despite being seven behind, Hull believes she can still catch Tavatanakit.
"Anything can happen around this golf course, as you see this morning," she said. "I think Stacy (Lewis) was eight-under through about 13 holes, and so you can get a low one going. So I just want to go low tomorrow.
"I like making a few birdies round here, so hopefully make a few more tomorrow."
Georgia Hall was a shot worse than her compatriot at the 18th with her double-bogey seven following four earlier bogeys as she signed for a 77 to tumble back to level-par.
Mel Reid (70) and Ireland's Leona Maguire (74) are both on two under, with Stephanie Meadow of Northern Ireland (71) on one under.