Fifteen-year-old amateur Lydia Ko enters the final round at the CN Canadian Women’s Open with a chance to rewrite the record books. The New Zealander holds a one-shot lead over major champions Stacy Lewis, Inbee Park and Jiyai Shin, and Chella Choi, who is seeking her first win, with 18 holes of play remaining at Vancouver Golf Club.

Fifteen-year-old Lydia Ko and Rolex Rankings No. 45 Chella Choi lead the CN Canadian Women's Open at 8-under-par 135 after 36 holes of play at Vancouver Golf Club.

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.

Read about story lines and interviews of the leading players at the Safeway Classic Presented by Coca-Cola.

Chella Choi fired a second-round 4-under 67 to take the lead at the Jamie Farr Toledo Classic Presented by Kroger, Owens Corning and O-I.