Harukyo Nomura hit a 1-under 70 and dropped into a share of 11th, six strokes off pace, after the third round of the Meijer LPGA Classic on Saturday.
Nomura, who started the day in sixth, was four under par after her fourth birdie on No. 12, but bogeyed No. 13 for the second straight day. She also bogeyed on Nos. 15 and 17 at the par-71 Blythefield Country Club for a three-day total of 9-under-par 204.
South Korea's Chun In-gee hit a 65 and shares the lead with last year's winner, Lexi Thompson, of the United States at 198.
"It was going nicely but again I had bogeys starting from that hole (No. 13) and it's really wasteful," said Nomura, who is seeking her third win of the season.
The 23-year-old had birdied both Nos. 11 and 12 before missing a three-foot par-putt.
"It looked straight but it hooked, I couldn't see the slope. It is tougher to win now, but I'll aim for the top five," she said.
Ayako Uehara, starting the day in 47th, shot a 2-under 69 and dropped to 53rd.