(Reuters) - Kim Hyo-joo held off world number one Lydia Ko in a fun duel with a burst of birdies that carried her to a seven-under 64 for a three-shot lead after three rounds of the Marathon Classic in Sylvania, Ohio on Saturday.
Kim, who began the round tied for the lead with 19-year-old Ko, edged in front with a birdie at the fifth before the pair matched three birdies in a row from the seventh at Highland Meadows.
"She's younger than me, but I learned a lot of things playing today's round, and I had so much fun," said Kim.