The world golf number one Lydia Ko is tied for 48th after two rounds of the latest LPGA tour event in Ontario, Canada.
The New Zealander carded three birdies and two bogies for a one under par first round 71 before a solid second round 68 that featured four birdies.
A week before the second Major tournament of the year, Ko is eight strokes behind the leaders Suzann Pettersen of Norway Mariajo Uribe of Colombia.
Pettersen, a winner of 14 LPGA titles, birdied four of her last seven holes to post a 13-under total of 131, ending the round level with Uribe (66), who has yet to win on the Tour.
Cristie Kerr, joint leader overnight with fellow American Cheyenne Woods and Thailand's PK Kongkraphan, was a further shot back after carding a 69 while Taiwan's former world number one Yani Tseng (65) was among a group of seven players at 11 under.
Cheyenne, the 24-year-old niece of 14-times major winner Tiger followed her opening 63 with a 73 to head into the weekend at Whistle Bear Golf Club five strokes off the pace.
South Korea's world number two Park In-bee, the defending champion, was at seven under after carding a 68, two strokes ahead of Ko.