Jutanugarn poured in six birdies on her back nine en route to a 67, the low round of the day. Hull and Kang both followed their 67 from Thursday with 69 on Friday.

In much warmer and gentler conditions than Thursday, Park was dialed in with her irons, but had a couple of three-putts that led to bogeys at the sixth and the 11th.

"Overall, it wasn't a bad round," Park said. "I had those three-putts after setting up birdie opportunities. So those miscues stuck in my mind for a bit, but I was able to pick up a handful of birdies as well."

Park said it certainly helped that the wind didn't blow as much as on the day of the first round, and when the gust picked up on a few occasions, it did so in much the same directions as her previous day.

"I think my irons were much sharper today than yesterday," Park said. "I gave myself a lot of birdie chances. I am a bit disappointed that I couldn't convert all of them."

Park and Jutanugarn are the only LPGA players with three victories this year. While Park leads Jutanugarn in the world rankings, the Thai star is ahead of the South Korean in the race for the Player of the Year, by 198 points to 127 points.

Jutanugarn, whose roller-coaster day included three bogeys on the front nine, said she tried to keep things simple.

"I didn't worry about the outcome and I wanted to just focus on the things that I can control," she said. "I didn't watch the leader board because, after my front nine, I didn't care about the lead. I just played golf."

Hull, seeking her first victory since November 2016, said she feels she is getting close to the winner's circle again.

"I've been playing really well this year, I've been putting some good scores together and finishing well in the majors," Hull said. "I feel like my game is up there. I just need to get confidence and get the win, and I'll feel really good."

Nasa Hataoka of Japan, the overnight leader at seven-under, stumbled to a 73 on Friday with three birdies and four bogeys. At six-under, she's tied for fifth with Lydia Ko of New Zealand, who carded a bogey-free 68.

Among 12 players from the Korea LPGA Tour, Bae Seon-woo was tops at four-under, which put her in a three-way tie for eighth.

Defending champion Ko Jin-young shot 72 to stay at one-under, where she's joined by the 2015 champion Lexi Thompson. (Yonhap)