So Yeon Ryu , also known as Ryu So-yeon, is a South Korean professional golfer who plays on the LPGA Tour and on the LPGA of Korea Tour. She won the 2011 U.S. Women's Open. Ryu turned professional in 2007 at age 17. Her first win as a professional came in February 2008 on the American Cactus Tour, in which she won by six strokes. She then joined the LPGA of Korea, winning the first event she played, the Sports Seoul Open. On 11 July 2011, Ryu won the U.S. Women's Open. Ryu picked up her second career LPGA Tour win in 2012 at the Jamie Farr Toledo Classic. Ryu had a big enough lead in the LPGA Rookie of the Year points standings to clinch the award for the season.