Kosei Tanaka's scheduled defense of his WBO super flyweight boxing title has been called off after the challenger failed to make weight Friday.The Japanese boxer was to fight Mexico's Jonathan Rodriguez as part of a world title tripleheader on Saturday at Tokyo's Ryogoku Kokugikan, but his opponent exceeded the weight limit by 2.9 kilograms. Rodriguez declined an opportunity to be re-weighed after two hours, citing poor health.Japan's Junto Nakatani and Riku Kano will fight as scheduled. Nakatani will defend his WBC bantamweight crown against Vincent Astrolabio of the Philippines, while Kan…READ FULL ARTICLE