Chun In-gee shot a three-under 69 on Friday to extend her leading score at the Women's PGA Championship to 11 under – six strokes better than anyone else through two rounds.
The South Korean, who is a two-time major winner, led by five strokes after the first round, and extended that by one more with five birdies and two bogeys in her second trip around the course. In doing so, she is the only player to shoot both rounds in the 60s.
Leading the chasing pack at five under is Australian Lydia Ko and American Jennifer Kupcho, with Ko's 67 tying for Friday's round of the day along with Lexi Thompson.
Thompson sits in a tie for ninth at three under, along with recent U.S. Open winner Minjee Lee and China's Xiyu Lin.
Heading into the weekend there are 26 women below par, including representatives from Thailand, Northern Ireland, Japan, Finland, England and South Africa.