Ai Miyazato and Pernilla Lindberg both fired under 65 on Thursday to share the first-round lead of the Canadian Women's Open.
Canadian Samantha Richdale posted a six-under 66 and is alone in third at Hillsdale Golf and Country Club.
Defending champion Michelle Wie, who won this title last year at St. Charles Country Club, shot a five-under 67 and is tied for fourth. Jenny Shin, Song- Hee Kim, Mi Hyun Kim and Angela Stanford joined Wie two off the lead.
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