 On May 1, 2013, Ryu pitched six innings against the Colorado Rockies and struck out 12 batters, his highest strikeout count in an MLB game so far.On May 28, 2013, Ryu pitched a complete game shutout against the Los Angeles Angels of Anaheim, striking out seven batters, walking none, and conceding only two hits.It was the first shutout in Ryu's MLB career and the first shutout for a Korean-born pitcher since Chan Ho Park and Sun-woo Kim.