Chasing a first major title for herself, and a first for American women this season, Amy Olson fired a bogey-free 65 to take a two-shot lead after the Evian Championship third round on Saturday.
Olson broke clear to post a 14-under 199 total after twice being in a four-way share of the lead at the sun-soaked Evian Resort Golf Club in Evian-Les-Bains, France.
An eagle at the par-5 9th first took her clear, and she added three birdies on the back nine to stretch her lead over Sei Young Kim.
"I really enjoyed (the nerves), that means I care, right?" Olson said. "It was fun to start solid with a birdie on the first hole."
Kim carded 64, flashing the form that set a LPGA Tour record 31-under winning total at the Thornberry Creek Classic in July.
"The big goal is to win a major tournament. I wish I could," said Kim, a seven-time winner on tour.
Mo Martin, a former Women's British Open winner, was two shots back on 10-under.
A further shot back was a group of three players including Georgia Hall (68), who was a homegrown British Open winner last month.
Five Americans are in the top 10, seeking a first major at the fifth and final try this season and a winner's check of $577,500. The year's major winners have come from Sweden, Thailand, South Korea and England.
Olson aims to learn from her previous majors experience playing in the last group on Sunday. In April, a 72 turned second place into tied for ninth at the ANA Inspiration.
Still, she said she learned then from watching playing partner Pernilla Lindberg win a three-way playoff after letting slip a three-shot lead.
Olson is also flourishing with her brother, Nathan Anderson, on the bag as caddie.
"Most of my golf memories do involve him," she said. "Having a sibling be part of it is very special."
The American challenge at Evian includes Ryann O'Toole, who made the biggest move on Saturday to be 8-under, tied for seventh. Her 63 was the lowest round this week.
While her South Carolina hometown Seneca is at risk of flooding from Hurricane Florence, Austin Ernst (69) joined the four-player group on 8-under with an eagle on the par-5 15th.
Puerto Rico's first-ever LPGA Tour player, Maria Torres, tied for the lead after each of the first two rounds and briefly shared the lead on Saturday. Torres dropped shots at the two closing par-4s and a 72 left her tied for 11th, seven shots back.
The 16-year-old Rachel Heck carded a 72 to be 2-over in her second major. The high-schooler previously tied for 33rd at the 2017 U.S. Women's Open.
McCarron fires 63 at Warwick Hills: Scott McCarron shot a 9-under 63 at Warwick Hills for a share of The Ally Challenge lead with Tom Lehman and Jeff Maggert.
Coming off a successful title defense two weeks ago in Calgary, Alberta, McCarron played an early three-hole stretch in 4-under — making an eagle on the par-4 12th. He had six birdies and a bogey on his second nine, birdieing the last three and four of the final five.
The 53-year-old McCarron has seven PGA Tour Champions victories, also winning in Wisconsin in June. He won three times on the PGA Tour.
Lehman shot his second straight 67, and Maggert had a 68 to match McCarron at 10-under 135. The 59-year-old Lehman won in Iowa in June for his 11th senior title.
Mark O'Meara had a 64 to join Tom Byrum (66), Paul Broadhurst (68) and Esteban Toledo (69) at 9-under. First-round leader Brandt Jobe had a 71 to drop into a tie for eighth with David McKenzie (69) at 8-under.