I.K. Kim leads the U.S. Women's Open after the morning session of the second round.
The South Korean shot a 3-under 69 on Friday for a 7-under total. Ha-Neul Kim, the first-round leader, had a 77 fall back to 1 under.
Top-ranked Inbee Park, who was at 5 under Thursday, is in the afternoon session. Park is trying to make history by winning the year's first three majors.
A day after Sebonack played relatively easy by U.S. Open standards, the wind picked up and the course had a more difficult setup.
I.K. Kim, the runner-up at last year's Kraft Nabisco Championship, has six top-10 finishes in 12 starts this year. She made five birdies and two bogeys Friday.
American Lizette Salas shot a 72 to stay at 4 under.