Kim had three consecutive birdies of the fifth -7 SY Kim (Kor); -5 B Henderson (Can), A Nordqvist (Swe); -4 Inbee Park (Kor); -3 B Pagdanganan (Phi); -2 M Harigae (US), G. Lopez (Mex), J Kupcho (US), C Ciganda (US); -1 N Hataoka (Jpn) Selected others: level C Hull (Eng); +1 J Ewart Shadoff (Eng); +2 L Ko (NZ); +5 M Reid (Eng); +8 G Hall (Eng), L Maguire (Ire); +10 L Davies (Eng)
South Korean Kim Sei-young will take a two-stroke advantage on the final round from the penultimate major of 2020, the Women & # 39; s PGA Championship.
The 27-year-old number seven in the world, who has not yet won a major title, started day one and had six birdies in her three-under 67 to reach seven under par
Two-time winner Anna Nordqvist shares second place with Brooke Henderson.
Charley Hull is the lead Briton player, tied for 11th, seven shots behind level par after a round of 69.
Kim, runner-up at this event in 2015 and second in the 2018 Evian Championship, claimed the most recent of 10 LPGA victories in last year's Tour Championship.
She had perhaps a three-shot lead at the start of Sunday's final round at Aro Nimink Golf Club in Pennsylvania, only for her six-meter par putt to get out of the cup. jumping on the 18th.
Nordqvist ran three consecutive birdies from the sixth hole but also ended up bogey after her approach bounced off the 18th green.
Canadian Henderson, whose only big win came at the Women's PGA 2016, knocked out five birdies in an 11-hole span from second in a bogey-free round and returned a 65.
Reigning Olympic Champion Inbee Park, a seven-time grand winner and three-time Women's PGA champion, is just three of the lead after a 66.
Hull had four birdies in her round and is one ahead of compatriot Jodi Ewart Shadoff, who dropped three shots in her last four holes, while Georgia Hall slid to eight after a second consecutive 74.