Inbee Park stretched her lead to two strokes at the Manulife Financial LPGA Classic with a third-round 66 at the Grey Silo course in Ontario.
The Korean led by one overnight ahead of compatriot Seo Hee-kyung, American Brittany Lang and China's Shanshan Feng, and added to her advantage over the former two as Feng slipped off the pace.
Park made six birdies, with just a solitary bogey at the par-three 17th, in a third strong round in succession. She has dropped just five shots over the course of the week, including at the first two holes of her opening round.
Her consistency was rewarded with a 14-under-par total, two better than Lang and Seo. The second Korean had five birdies with a bogey at eight while Lang left her run late, finishing birdie-birdie-eagle having played par golf to that point.
Sweden's Anna Nordqvist was two shots further back after a four-under-par 67, with each nine holes featuring three birdies and a bogey.
World number four Feng shot 70 to find herself in a group of four players at nine under, which also included Americans Nicole Hage and Sandra Changkija and Sweden's Karin Sjodin.
A British challenge failed to materialise, with Jodi Ewart five under after a one-over-par 72 and Karen Stupples back at two under after taking 73.
Collated third-round scores (Par 71):
199 Inbee Park (Kor) 69 64 66
201 Hee Kyung Seo (Kor) 66 68 67, Brittany Lang 69 65 67
203 Anna Nordqvist (Swe) 64 72 67
204 Sandra Changkija 63 72 69, Karin Sjodin (Swe) 67 68 69, Nicole Hage 72 65 67, Shanshan Feng (Chn) 66 68 70
205 So yeon Ryu (Kor) 70 65 70, Chella Choi (Kor) 69 66 70, Lexi Thompson 66 69 70, Stacy Lewis 72 64 69, Mi Jung Hur (Kor) 69 68 68
206 Jennifer Song 71 67 68, Amy Yang (Kor) 68 70 68, Karine Icher (Fra) 72 68 66
207 Sun Young Yoo (Kor) 68 67 72, Katie Futcher 68 67 72, Jeong Jang (Kor) 70 68 69
208 Paula Creamer 69 68 71, Jin young Pak (Kor) 69 70 69, Christel Boeljon (Ned) 71 68 69, Jodi Ewart (Eng) 68 68 72, Jacqui Concolino 69 70 69, Kris Tamulis 70 67 71
209 In Kyung Kim (Kor) 70 69 70, Maude-Aime Leblanc (Fra) 73 68 68, Suzann Pettersen (Nor) 67 70 72, Sandra Gal (Ger) 72 68 69, Candie Kung (Tai) 68 72 69, Min seo Kwak (Kor) 68 72 69, Angela Stanford 67 71 71, Jennifer Johnson 69 69 71, Mina Harigae 72 70 67
210 Anna Grzebien 70 71 69, Kristy McPherson 70 72 68, Hee Young Park (Kor) 71 69 70
211 Ayaka Kaneko 73 68 70, Seon Hwa Lee (Kor) 68 70 73, Karen Stupples (Eng) 70 68 73, Beatriz Recari (Spa) 70 70 71, Laura Diaz 69 70 72, Reilley Rankin 70 72 69, Danielle Kang 69 73 69, Jennie Lee 72 69 70, Heather Bowie Young 72 69 70
212 Vicky Hurst 74 66 72, Mindy Kim (Kor) 68 73 71, Pornanong Phatlum (Tha) 71 70 71, Karrie Webb (Aus) 75 65 72, Victoria Tanco 76 65 71
213 Michelle Wie 70 70 73, Belen Mozo (Spa) 73 70 70, Jenny Suh 69 70 74, Morgan Pressel 70 71 72, Momoko Ueda (Jpn) 68 73 72, Sarah-jane Smith (Aus) 70 73 70, Julieta Granada (Par) 70 72 71, Leta Lindley 75 68 70
214 Maria Hernandez (Spa) 70 72 72, Alena Sharp (Can) 73 70 71, Isabelle Beisiegel 71 70 73
215 Jennifer Rosales (Phi) 71 68 76, Na Yeon Choi (Kor) 72 70 73, Taylor Coutu 70 69 76, Katherine Hull (Aus) 70 73 72
216 Danah Bordner 73 68 75, Jee Young Lee (Kor) 71 71 74, Rebecca Lee-bentham (Can) 72 71 73, Meena Lee (Kor) 74 68 74, Dori Carter 71 72 73, Lacey Agnew 67 76 73
217 Stephanie Louden 70 71 76, Karlin Beck 66 73 78, Meaghan Francella 71 72 74
218 Lorie Kane (Can) 71 72 75
219 Angela Oh 74 68 77, II-hee Lee (Kor) 70 71 78, Hanna Kang (Kor) 71 71 77
