Japanese pitcher Yoshinobu Yamamoto was seen working out at the Los Angeles Dodgers’ Arizona spring training facility Tuesday as he prepares for his first season in America. The 25-year-old Yamamoto, who achieved nearly unprecedented success in the final three years of his seven seasons in Japan’s major leagues, arrived around 8:30 a.m. and spent around five hours at the facility outside Phoenix. Yamamoto, whose 12-year, $325 million contract is the most valuable ever offered to a pitcher, led Japan’s Pacific League in ERA, strikeouts, wins and winning percentage in each of the past three seas…