South Koreans Inbee Park and Ryu So-yeon, alongside American Yealimi Noh, are in a three-way tie at the top of the leaderboard heading for the final round of the Volunteers of America Classic in Texas.
The trio are on four-under-par in in Texas, with Ryu So-yeon having soared into contention after carding a super six-under 65.
England's Charley Hull is among a cluster of seven players a shot further back as the LPGA event heads for a thrilling climax.
Leona Maguire carded her best round of the weekend - a one-under 70 - to move to three-over and in a tie for 30th.
Stephanie Meadow shot a three-over 74 and is nine-over for the tournament.
