Minjee Lee is four shots behind leader Lexi Thompson in a tie for sixth going into the final round of the Manulife LPGA Classic in Cambridge, Ontario.
Australian Lee carded a three-under-par 69 in the third round to be 13 under for the tournament while American Thompson had a 67 to lead compatriot Lindy Duncan (67) by one shot in Canada on Saturday.
Long-hitting Thompson sank a 12-foot birdie putt at the final hole to earn the lead at 17 under.
Thompson enjoyed a bogey-free round on the Whistle Bear course to edge closer to a second victory of the year on the LPGA circuit.
South Korean Chun In-gee, the 2015 US Women's Open champion, carded 68 to trail by two strokes, while Thai world No.2 Ariya Jutanugarn had the day's best score, a 65, to jump within three shots with Canadian halfway co-leader Alena Sharp (70).
"Today was a lot windier than the last two days, so there was just more shot making and some pins were pretty difficult to get to," Thompson told reporters.
"It was more just making pars. I'm playing very well and making some good putts, so hopefully just continue that tomorrow."
Thompson, 22, made headlines at the ANA Inspiration major two months ago, when she was penalised four strokes after it came to light she had mismarked her ball on a green during the third round.
She was docked two strokes for the infraction, and two more because she had signed an incorrect scorecard before the incident was brought to the attention of officials.
Thompson subsequently lost in a playoff, and her situation aroused sympathy with many golf fans, though not so much with insiders.
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