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.