Los Angeles Dodgers pitcher Yoshinobu Yamamoto became a World Series champion in his major league rookie season, two years after he won the Japan Series with the Orix Buffaloes. Although superstar teammate Shohei Ohtani was always the center of attention, Yamamoto made significant contributions to the Dodgers’ postseason success. “I’m so happy,” Yamamoto said after the Dodgers’ World Series triumph Wednesday. “There were games in the playoffs we wouldn’t have won if any piece of the team was missing.” The 26-year-old right-hander had a 2-0 record with a 3.86 ERA in four postseason starts. In t…