Kim Sei-young took a second-round five under 67 to maintain a lead at the halfway point of the LPGAs season-ending Tour Championship.
The South Korean carded six birdies and a bogey to move to 12 under and remain in contention for a LPGA triumph.
Germanys Caroline Masson is next after shooting a 66 to climb the leaderboard.
Englands Georgia Hall, who had made a powerful beginning in Florida, dropped down the order.
The 2018 Womens British Open winner carded a five-under 67 in the first round to sit down inside two shots of the guide but is currently tied for off six shots Kim.
There were fortunes for Halls compatriot Jodi Ewart Shadoff, who took at at seven-under 65 to move to a share of ninth alongside Hall and one ahead of Englishwomen Charley Hull and Bronte Law.
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