A day after shooting a sizzling 10-under-par 62, the defending champion hit 16 of 18 greens in regulation but managed just two birdies to sit five shots off the pace set by South Korea's Sei Young Kim.
Kim shattered the 72-hole scoring record, which she previously owned along with Annika Sorenstam, who totaled a 27-under in 2001.
Ko had three bogeys and two birdies, all on her front nine, and played par golf after the turn to slip down the leaderboard. The only blemish of her round was a double bogey on 18.
"I set my goal today for a bogey-free round", Kim was quoted by saying to LPGA.com. "I'm very happy. A dream come true".
Kim, who started the final round with an eight-shot lead, once again started the course strong, kicking off with a birdie on the first hole. Yang, with a birdie on the final hole for a 68, tied for third at 20 under with Emma Talley and Anna Nordqvist, who each had a 67. "She just kept the foot down". After that, I wanted to - really wanted (the LPGA) record.
South Korean Amy Yang was Kim's closest pursuer after a 67 for 200.
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She was ranked as high as number eight in the world previous year after her win in Mexico and has struggled for much of 2018.
DONEGAL, Ireland (AP) - Russell Knox of Scotland holed almost identical putts of 40 feet on the 18th hole, first to get into a playoff, and then to beat Ryan Fox and win the Irish Open for his first European Tour victory.
"First hole, my second shot was nearly a tap-in birdie, so (I) started really solid", said Kim, who is seeking a seventh LPGA title.
With a win, Kim took home a total prize of $300,000 and became the 61st player on the LPGA Tour history to exceed $5 million in prize money. "When someone plays that good, she deserves to win".
The win was the seventh of Kim's LPGA career, her first since she captured the Citibanamex Lorena Ochoa Match Play in May 2017. In addition, the 17-under marks the first time in her career, amateur, college or professional, that she has finished in double figures. Making two of them from nearly identical positions, I mean, that's a bit of a bonus.
No one had a chance Sunday.
The 34-year-old, who first entered the PGA Tour in 2004, had last won in Las Vegas in October 2011.
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