The USA's Yealimi Noh leads the Founders Cup by a shot ahead of the final round, with Leona Maguire carding a successive round of 68 as she targets a high finish on Sunday.
Maguire, with birdies on 2, 4 and 17 and no bogeys, has moved to four under and is in a share of 31st at the Bradenton Country Club.
On 18 under, Noh leads by a shot, after a carding a 63. After birdies on 8 and 9, the 23-year-old then picked up six more on the homeward nine.
Korea's Jin Young Ko is alone in second after a 66 in her third round.
Sharing third spot on 13 under are Megan Khang from the USA and Korea's Jin Hee Im, with Nelly Korda and Australian Hannah Green a shot further back in a tie for fifth.
