Twenty-eight-year-old Kazuto Ioka, who won world titles in three separate weight classes, announced Sunday that he will hang up his gloves and retire from the ring."I'm satisfied with myself because I could win in three classes, which is also the reason why I started boxing," Ioka told a press conference.In a message to his fans, he said, "I think I'm here now because of your support, and I want to express my greatest appreciation."In 2012, in the third defense of his WBC minimumweight crown, Ioka won the WBA minimumweight title from champion Akira Yaegashi, becoming the first Japanese to u…READ FULL ARTICLE