A blistering second round has seen Kiwi golfer Lydia Ko take the outright lead at the halfway stage of the Marathon Classic event in Ohio.
Starting the day in a two-way tie for the lead alongside American Danielle Kang, Ko carded a six-under par 65 to move to 13-under for the tournament.
She began the day with four-straight birdies, but hit a rough patch of pars and bogeys.
Ko then ended the round with back-to-back birdies to go one stroke ahead of England's Jodi Ewart Shadoff, with Kang a further shot behind.
"I got off to a pretty hot streak and when you're in a good momentum, I think it's when you almost don't realise what you're shooting and that was the case yesterday as well," said Ko.
"Today I swear coming down to the last [hole] I thought I was four-under, so I said 'OK, I want to make one more birdie to finish under par for this nine, but I was apparently five, so I'll take the six-under over the five any day."
As a teenager, Ko was the youngest player - male or female - to reach No.1 in world rankings, but she's struggled in recent years, currently ranked 55th.
Her last tournament victory was the Mediheal Championship in April 2018, but she has fond memories of the Sylvania course, where she's won twice before in 2014 and 2016, and made the top 10 twice.
Ko feels her success in the tournament is down to the help of her new swing coach, Sean Foley.
Foley is Ko's sixth coach in four years, but he's worked with the likes of Tiger Woods and most recently Englishman Justin Rose
"I think Sean has been helping me to look a lot at my swings from when I was an amateur," she said.
"The big key for me is to be aggressive and in the last stretch of holes I thought I hit really aggressively, especially off the tee and it went out nice.
"The more I see those good results, the more confidence will build so hopefully I will be able to continue doing that and believing in myself, I think that's a really big key."
