Date of Birth: 
Place of Birth: Tajimi, Gifu Prefecture, Japan
About Kosei Tanaka
- Kosei Tanaka (?? ??, Tanaka Kosei, born June 15, 1995) is a Japanese professional boxer.
- He is a three-weight world champion, having held the WBO flyweight title since September 2018 and previously, the WBO minimumweight title from 2015 to 2016 and the WBO junior-flyweight title from 2016 to 2017.
- 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 just 12 bouts. As of November 2019, Tanaka is ranked as the world's best active flyweight by The Ring magazine, BoxRec and the Transnational Boxing Rankings Board.
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