Jennifer Rosales, Katie Futcher, Lindsay Wright and Caroline Hedwall led the way at the Robert Trent Jones Golf Trail's Magnolia Grove complex with 5-under 67s.
Filipino Rosales birdied five of the first seven holes on the back nine after having a birdie and a bogey on the front nine.
"Today was an easy day for me," Rosales said. "I hit most of the fairways and greens. I only missed, I think, a (one) green today. My putting was very good today."
American Futcher was in front at 6-under after 17 holes but a bogey on the par-4 ninth dashed her hopes of ending the day with the outright lead.
Australian Wright, who won the New Zealand Women's Open in February, and Sweden's Hedwall had bogey-free rounds.
"It feels like it's kind of target golf and I like that," Hedwall said. "I enjoy just hitting it... I like that and I think I did that well today.
"Just everything feels good, and hopefully I can play as well for the rest of the week."
Sun Young Yoo was a shot behind the leaders along with Stacy Lewis, Morgan Pressel, Mariajo Uribe, Sydnee Michaels, Cindy LaCrosse, Haeji Kang and Mi Jung Hur.