LOS ANGELES -- Hyun-Jin Ryu has been pitching in the United States for less than a year, but he's perfectly aware of how difficult it is to repeat success in the major leagues.The Dodgers' left-hander said he flew to California from his native South Korea two weeks before spring training. He wanted to get in better shape to avoid a second-year regression."I realized last year that I was underprepared," Ryu said.It didn't really show.