South Korea's Jiyai Shin shot a second-round 68 on Friday to maintain a one-shot lead in the Kingsmill Championship.
The overnight leader carded four birdies and a bogey to finish on 12 under par, one stroke clear of American Danielle Kang, who shot a superb seven-under-par 64 on the day.
Dewi Claire Schreefel of the Netherlands and American Paula Creamer share third place a further shot back after rounds off 66 and 67 respecitively, while Spain's Azahara Munoz (68) and Lexi Thompson (66) follow on nine under, three back.
Shin said kept a close eye on the scoreboard.
"I have to know my position, and I keep changing my plan each hole after I check the positions," she said. "I saw a lot of players play good today, so it will make for fun competition the next two days."
"I really like when I'm on the top, but it also can come with a pressure, a little bit of pressure. But it's also other players saying they get the pressure, too, so I just keep focused on my game."
Second-placed Kang's 64 was the round of the day.
"I started off the day thinking just take it shot by shot. I've been approaching shots differently this whole week," Kang said. "I just am trying to see what works, and my brother taught me how to putt."
Schreefel might have had an even better round, but was penalised two strokes after her ball moved once she had already marked it. Instead of playing it from the new spot, she incorrectly moved it back to the mark - which was still in place.
"Things like that just kind of fuel me up," Schreefel said. "You know, it's a little bit upsetting in the moment and you're losing two shots while you're in the hunt to make a really good score. It's unfortunate but we live and learn."
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