WATERLOO, Ontario — Angela Stanford and Catriona Matthew shot eight-under 63s to share the first-round lead at the Manulife Financial LPGA Classic on Thursday, two strokes ahead of top-ranked Inbee Park.

Park is trying to become the first golfer to win four straight LPGA Tour events since Lorena Ochoa in 2008.

Park was joined by American Irene Cho, Spain's Belen Mozo and South Korea's Hee Young Park and Meena Lee at 65. American Ryann O'Toole and South Koreans Jenny Shin, Amy Yang and Ji Young Oh were three shots off the lead at 66.

Defending champion Brittany Lang opened with a 69.