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