Chella Choi shrugged off two bogeys to start the back nine, birdieing three holes coming down the stretch for a 4-under 67 and a one-shot lead Friday after the second round of the Jamie Farr Toledo Classic.
Choi, winless in her four years on the LPGA tour, started with a 66 and was at 9-under 133 at rainy Highland Meadows Golf Club.
Inbee Park, winner of the most recent tour event, the Evian Masters, had the day's low round, climbing 29 spots on the leaderboard with a 6-under 65. Mika Miyazato had a 68, and Hee Kyung Seo a 66 to join Park at 8 under.
First-round leader Pernilla Lindberg, Hee-Won Han, Karine Icher and So Yeon Ryu were another shot back. Lindberg had a 71, Han shot 67, Icher 69 and Ryu 68.