Katsuya Onizuka (鬼塚 勝也 Onizuka Katsuya born Takashi Onizuka on March 12 1970) is a former WBA Super Flyweight champion from Kitakyushu Japan. Onizuka was an extremely popular boxer in Japan creating a boxing boom in Japan during the early 1990s along with Joichiro Tatsuyoshi.
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