Hyo Joo Kim, Mirim Lee and Haru Nomura each shot a 5-under 66 in the first round to share the lead at the Marathon Classic at Highland Meadows Golf Club in Sylvania, Ohio.
Kelly Shon, Ariya Jutanugarn and Celine Herbin are each one shot back at 4 under.
Kim, who started on the back nine played 17 holes bogey-free at 6 under, but then she bogeyed the ninth, her 18th, to drop to 5 under. She said the rain from the night before allowed her to have some more success.
“When I was in the practice round it was kind of dry, like greens kind of bounce little bit, Kim said.