Teen amateur Lydia Ko shot a blistering 10-under 63 to take the outright lead after the first round of the Australian Women&aposs Open on Thursday. Ko, who won the New Zealand Women&aposs Open at the weekend, continued her impressive form with a remarkable round that included an eagle, 11 birdies and three bogeys at the Royal Canberra Golf Club. The 15-year-old said it was her best performance since carding an eight under on her way to winning the New South Wales Open last year. Ko said she was anxious to play alongside world number one Yani Tseng and Michelle Wie, but settled quickly despite opening with a bogey on the 10th hole. “At the 10th I thought what is today going to be like, and after a few birdies, I kind of settled in and I felt pretty comfortable,” the New Zealander said. “I was pretty nervous when I saw the draw that I was playing with two of the big names. “But Yani and Michelle, we had a few good conversations so I think that made it more enjoyable.” Colombia&aposs Mariajo Uribe was a stroke behind in outright second, followed by Jiyai Shin of South Korea at eight under. Japan&aposs Ayako Uehara, Canadian Rebecca Lee-Bentham and South Korea&aposs Mi Hyang Lee were tied for fourth at seven under, one shot ahead of Italian Giulia Sergas. Taiwan&aposs Tseng led a group of six players, including local hopes Katherine Hull-Kirk, Kristie Smith and Sarah Jane Smith, in equal eighth at five under. American Wie shot a 74 for a share of 99th.