PHOENIX - Sei Young Kim stumbled late Saturday afternoon in the JTBC Founders Cup, handing the lead to Eun-Hee Ji and putting Stacy Lewis, Lydia Ko and many others in far better position than they expected.
Three strokes ahead after an eagle on the par-4 13th, Kim failed to birdie the par-5 15th and bogeyed the par-4 16th and par-3 17th. Her 2-under 70 dropped her into a tie for second with Lewis, a stroke behind Ji.
''It's OK. I have one day, tomorrow,'' said Kim, the 23-year-old South Korean player who won three times last season and was the LPGA Tour's rookie of the year.
Ji made a 12-foot birdie putt on 17 and finished with a 65 to reach 18-under 198 on another perfect day at Desert Ridge's Wildfire Golf Club. She is winless since the 2009 U.S. Women's Open.
''My putting was really good,'' Ji said. ''My iron shot was really good, too. I was really struggling with my irons the last couple of weeks, but it's getting better this week.''
Lewis had a 64, closing with a 4-foot birdie putt on the par-4 18th.
''These scores are just ridiculous,'' Lewis said. ''You just can't look at a leaderboard. You just go out there and make as many birdies as you can.''
The Texan won the event in 2013 and finished second the last two years. She has nine runner-up finishes in a 43-event victory drought that dates to June 2014.
''I'm just really happy to see some good scores going up,'' Lewis said.
Jacqui Concolino was two strokes back after a 68. The top-ranked Ko, Carlota Ciganda and Paula Creamer were another shot behind. Ko and Ciganda shot 64, and Paula Creamer had a 67.
''When I saw some of the highlights of the leaders, they seem like they were holing a lot of putts, and that's what I wasn't doing the first two days,'' Ko said. ''I was a lot better today.''
Kim opened with rounds of 63 and 66 to break the tournament 36-hole record at 15 under and take a two-stroke lead into the weekend. She threatened to make it a runaway when she eagled the 240-yard 13th, hitting a 3-wood to the fringe and holing a 30-foot putt, but soon found trouble.
Her iron approach sailed left into a bunker and she two-putted for par on the 15th, the par 5 she birdied Thursday and eagled Friday.
On the 16th, her wedge from 90 yards went over the green into thick rough, leaving a difficult shot over a ridge. She didn't get the chip all the way up the ridge and it rolled down and across the green. That left her a 40-foot par try that stopped on the left edge.
Her 9-iron went left on 17 and rolled down a hill into thin rough 50 feet from the pin. She hit her chip all the way to the opposite edge of the green and missed a 15-foot par putt.
''It's OK,'' Kim said. ''I like to play the chase on the lead. It's more comfortable to me.''
U.S. Women's Amateur champion Hannah O'Sullivan followed her second-round 64 with a 72 to drop into a tie for 47th at 8 under. The 17-year-old is a high school senior in the Phoenix suburb of Chandler.