Rolex Rankings No. 1 Yani Tseng looked to be back to her old form on Thursday, firing a 6-under 66 to take sole possession of the first-round lead at the CN Canadian Women’s Open outside Vancouver. Tseng leads by one over 2012 U.S. Women’s Open champion Na Yeon Choi. It marks the first time that Tseng has led or co-led at the end of a round since she shared the third-round lead with Karin Sjodin at the Kraft Nabisco Championship back in March.

The LPGA Tour continues its Northwest swing as it crosses over the border this week to Coquitlam, British Columbia, just outside of Vancouver, for the second Canadian event of the year.

The Manulife Financial LPGA Classic will feature a field of 144 players at the heralded Grey Silo Golf Course in Ontario, competing for a $195,000 prize. The inaugural event is one of five tournaments added to the Tour's 2012 schedule.