DUBLIN, Ohio (Ticker) -- Korea's Mi Hyun Kim carded a 5-under-par 67 on Saturday and capitalized on a nightmarish effort by first-round leader Mhairi McKay to take the lead after 36 holes of the LPGA Wendy's Championship for Children.

Kim's two-round total of 9-under 135 is three shots better than Danielle Ammaccapane, who jumped from 37th to second following a 7-under 65.

Hee-Won Han of Korea is third at 139, one shot better than Michele Redman. Four golfers, including Lorie Kane of Canada and Rosie Jones, are tied for fifth at 142.

McKay, who took a one-stroke lead into Saturday, shot an 8-over 80 and is tied for 22nd at 1-over 145.

Defending champion Wendy Ward is at 146 and tied for 31st.

The 25-year-old Kim has a win and seven top-10 finishes in 15 starts this year. She was solid in the opening round Friday and has yet to record a bogey.

On Saturday, she birdied five of the first 13 holes, mostly as a result of solid short-iron approach shots. She also was able to get up-and-down when she did find trouble.

"It was a very hard day out there from the standpoint of heat, humidity, and a very hard course," said Kim, who captured the Giant Eagle LPGA Classic two weeks ago. "I had a lot of good putts out there."

Ammaccapane also played bogey-free golf. Starting on the back nine, the 36-year-old mother of one posted three birdies over her first seven holes and four over her final eight.

She inched closer to contention at No. 9, chipping within four feet and converting the birdie.

"The putter felt really good today," Ammaccapane said. "Obviously, I had a hot putter today. I hit the ball better, and I seem to have put it on the right side of the hole to be able to have some putts and be able to make them."

Ammaccapane has seven career wins and five top-10 finishes this year.

"I'm putting together some good rounds of golf," Ammaccapane said. "The putter has been the big difference. I changed a couple things. You know, it feels good in my hands."

Han, 24, never has won on the LPGA Tour but does have five top-10 finishes in 17 starts this year. She has finished second twice in 2002 and put herself in contention with a 4-under 31 on the back nine.

Redman had two birdies but gave back both strokes when she found water at the 148-yard par-3 17th. She finished at even-par for the round.

"My 8-iron the last two weeks, it's cost me a lot of money out here," Redman said. "It cost me the tournament last week, to be honest with you. It doesn't seem to be quite right."

McKay, who also is looking for her first win, followed her opening-round 65 with a disastrous trip around the course. She was just 2-over on the front nine but collapsed over the back nine, recording bogeys on five holes, including a double-bogey at No. 17.