Choi had one bogey -- just her second of the week -- against five birdies Saturday for a 54-hole total of 12-under 201. Brittany Lang, who was tied for the lead after the second round, had a 2-under 69 Saturday and is at 11-under for the tournament.
Azahara Munoz turned in a third-round 68, which has her in third overall at 10-under. Pak Se-ri had five birdies in a six-hole span en route to a third-round 6-under 65. That pulled her into a tie for fourth with Yani Tseng (69 Saturday) and Stacy Lewis (72). Lewis was tied with Lang for the second-round lead.
Choi was 1-under after four holes but had a bogey 4 on No. 5 -- the same hole she bogeyed Thursday. She made the turn at 1-under after a birdie at the ninth hole.
She backed that up with another birdie at 10 and moved into sole possession of the lead with back-to-back birdies at Nos. 15 and 16.