LPGA: Lydia Ko outlasted Ariya Jutanugarn and Mirim Lee to win the Marathon Classic for her fourth LPGA Tour victory of the season.
South Korea's Kim, one of three players sharing the overnight lead, had four birdies in her three-under 68 to join Ko on eight-under 134 after two rounds on the Highland Meadows course in Sylvania, Ohio. She missed a short birdie putt on the final hole.
New Zealander Ko tweaked her radar accurately enough on the fourth attempt, sinking a two-metre birdie putt to secure her 19th professional title at the age of 19 and a 14th LPGA win.
Michael Johnson, a former player at Auburn University making his pro debut, carded a 65 for sole possession of third place on 132, one shot in front of a group of six players on 133. She added birdies on the par-3 14th and par-5 17th and parred the par-5 18th to finish at 15 under. "That's kind of been my motto the last week or so, just believe in it and trust it, and that's what I keep trying to do". He chipped to 5 feet but Baddeley closed it out before Kim finished. "I didn't feel much pressure, I just enjoyed it with Lydia Ko".
The only time Kim has bested the 64 she shot Saturday was when she shot a 61 at the 2014 Evian Championship, where she eventually went on to win.
Stacy Lewis was fifth at 11 under after a 71.
"But we all deserve to be holding the trophy but I think I am very fortunate to be the one (with it)", said Ko.
Alison Lee and Ha Na Jang were one shot behind the leaders in a tie for second at 7 under.
But the South Korean-born Kiwi sounded philosophical about her inability to close out what could have been a third major victory in four starts.
"It's really nice for me to have a chance in a playoff", she said.
"Today putter is good, shots good, second number - everything smooth", she said.
Brittany Lang, coming off a playoff victory over Anna Nordqvist on Sunday in the U.S. Women's Open, had a 70. "It's definitely been a while since I've felt like this, but it was worth the wait". Nordqvist also was 3 under after a 70.