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Kosei Tanaka (born 15 June 1995) is a Japanese professional boxer. He is a four-weight world champion, having held the World Boxing Organization (WBO) mini-flyweight title from 2015 to 2016; the WBO junior-flyweight title from 2016 to 2017; the WBO flyweight title from 2018 to 2020; and the WBO super-flyweight title from February 2024 to October 2024. Upon winning his first world title in only his fifth bout, he became the fastest Japanese fighter ever to become a world champion. Along with Vasyl Lomachenko, he is also the fastest ever fighter to win titles in three weight-classes, having accomplished the feat in only 12 bouts. He also surpassed Oscar De La Hoya to become the fastest four division champion, setting the bar at 21 fights Weight(s) Mini flyweight Light flyweight Flyweight Super flyweight Height 5 ft 4 1⁄2 in (164 cm) Reach 64 1⁄2 in (164 cm) Stance Orthodox Boxing record Total fights 22 Wins 20 Wins by KO 11 Losses 2
