Kim Sei-young took a five under 67 to maintain a two-shot lead at the halfway stage of the LPGA Tour Championship.
The South Korean carded six birdies and a bogey to move to 12 under and stay in contention for a LPGA win.
Germanys Caroline Masson is next after shooting at a 66 to climb the leaderboard.
Englands Georgia Hall, who had made a beginning in Florida, fell down the order.
Even the 2018 Womens British Open winner carded a five-under 67 to sit down inside two shots of the guide but is now tied for ninth, off six shots Kim.
There were fortunes because of the compatriot Jodi Ewart Shadoff of Hall, that took at at 65 to move into a discussion of one ahead of Englishwomen Charley Hull and Bronte Law and ninth alongside Hall.
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