LONDON - South Korea's Ryu So-Yeon fired a bogey-free opening round of nine-under par 63 Thursday to seize a one-stroke lead over compatriot Choi Na-Yeon at the LPGA Canadian Women's Open. Ryu, the 2011 US Women's Open champion, hit all 14 fairways and needed only 25 putts, reaching 16 of 18 greens in regulation and chipping in with a sand save to stand atop the leaderboard. "I really feel great about that, especially because before I was going to tee off my warming up shots were really bad," Ryu said. "So I had zero expectation I could play this low, but I played really well so I'm really happy." Ninth-ranked Ryu, whose only other LPGA title came at the 2012 Toledo Classic, had 10 top-10 finishes without a victory last year and has nine more this year without lifting a trophy.–AFP