(AFP) - South Korea's Lee Mi Rim stormed into the outright lead by three strokes at the US Women's Open, firing a record-tying eight-under 64 in Thursday's opening round.
The world No. 32 tamed the CordeValle Golf Club course to become the first player since 1999 in the US Women's Open history to shoot a round of eight under.
"The course is perfect now," Lee said.
"The greens are really fast. I just try make par, that's it."
Lee came within one shot of tying Helen Alfredsson's record for the lowest 18-hole score in the tournament of 63, set in the first round in 1994 in Michigan.
Lee owns a three-shot lead over Cristie Kerr, Min Jee Lee and Amy Yang and a four-shot lead over Kelly Tan, Brittany Lang and Anna Nordqvist.
Kerr said she expects course conditions to get tougher as the week goes on.
"We played in the morning and took advantage of it," Kerr said of the cool weather and softer greens.
"Obviously, Mi Rim had almost a career round today. I definitely expect it to change.
"I don't think the USGA likes somebody shooting eight under on their golf course. So you have to expect it to change, and if it doesn't, then you'll have opportunities to score.
Kerr, who won the US Women's Open in 2007, had seven birdies and two bogeys. Australia's Min Jee Lee had an eagle on the par-four sixth, four birdies and one bogey. Yang had six birdies and one bogey.
Lee Mi Rim started quickly on Thursday with a birdie on the par-four 10th, her first hole of the day. She birdied six of the nine holes on the front nine.
"I think everything was good," Lee said.
"The driver was good and the irons good. I had a couple missed putts, but not bad. It was good."
Lee has two career victories on the LPGA Tour and three on the LPGA of Korea Tour. Her last win on the US Tour was in 2014 and she tied for fourth at the Women's PGA Championship this year.