08/24/2012 09:33 EDT | Updated 10/24/2012 05:12 EDT

15-year-old Lydia Ko shares lead with Chella Choi in Canadian Women's Open

COQUITLAM, B.C. - Teen star Lydia Ko shot her second straight 4-under 68 on Friday for a share of the lead with Chella Choi in the Canadian Women's Open.

Ko, the 15-year-old South Korean-born New Zealander who won the U.S. Women's Amateur two weeks ago, birdied four of the last seven holes in a bogey-free round to match Choi at 8 under. In January, Ko won the New South Wales Open in Australia at 14 to become the youngest player to win a professional tour event.

The 22-year-old Choi, from South Korea, followed her opening 72 with a 64 on The Vancouver Golf Club course. She rebounded from a sore shoulder that hampered her Thursday.