PRIDDIS, Alberta (AP) — Ariya Jutanugarn had five birdies in a six-hole stretch and shot an 8-under 64 on Friday to take a three-stroke lead in the Canadian Pacific Women's Open. A week after withdrawing from the Rio Olympics because of a left knee injury, the 20-year-old Thai star played 20 holes Friday at Priddis Greens. The former Alabama player had a seven-hole stretch without a par, making three straight birdies, three straight bogeys and a par. In the event before the Olympics, Jutanugarn won the Women's British Open for her fourth victory of the year. Because to me it's a little bit narrow and I can't hit my driver. Ko shot a 69, making four straight birdies in the middle of the round. The 19-year-old New Zealander won in 2012 at Vancouver Golf Club at 15 years, 4 months to become the LPGA Tour's youngest winner and fifth amateur champion. Henderson dropped a stroke in the completion of a first-round 72 and had a double bogey on the par-3 eighth — her 17th — in a second-round 68. The 18-year-old from Smiths Falls, Ontario, beat Ko in a playoff in June in the KPMG Women's PGA Championship for her first major title, and successfully defended her Cambia Portland Classic title in early July.