The Japan TimesJun 5, 2025
Four-division world champion Kosei Tanaka has called time on his professional career at the age of 29 due to repeated eye injuries. https://www.japantimes.co.jp/sports/2025/06/05/more-sports/kosei-tanaka-announces-retirement/?utm_medium=Social&utm_source=mastodon #moresports #koseitanaka
Four-division world champion Kosei Tanaka retires at 29 due to eye injuries

Tanaka is the fastest boxer to earn belts at four different weights.

The Japan Times
The Japan TimesFeb 25, 2024
Japanese boxer Junto Nakatani became a three-division world champion Saturday by claiming the WBC bantamweight crown with a sixth-round stoppage of Mexico's Alexandro Santiago. https://www.japantimes.co.jp/sports/2024/02/25/more-sports/nakatani-three-division-champ/ #moresports #juntonakatani #takumainoue #koseitanaka
Nakatani TKOs Santiago to become three-division world champ

The undefeated 26-year-old southpaw was one of three victorious Japanese fighters in a world title tripleheader at Tokyo's Ryogoku Kokugikan.

The Japan Times
The Japan TimesFeb 13, 2024
Kosei Tanaka aims to win by knockout when he faces Mexico's Christian Bacasegua in Tokyo on Feb. 24 for the vacant World Boxing Organization super flyweight title. https://www.japantimes.co.jp/sports/2024/02/13/more-sports/boxing-tanaka-knockout-wbo/ #moresports #koseitanaka #christianbacasegua #worldboxingorganization
Tanaka to go for knockout in WBO super flyweight title bout

It will be the first world championship fight for Tanaka since he suffered the first loss of his career in December 2020.

The Japan Times