Four-division world champion Kosei Tanaka retires at 29 due to eye injuries

Kosei Tanaka, a four-division world champion known for winning belts at strawweight, light flyweight, flyweight, and super flyweight, retired from boxing at 29 due to repeated eye injuries. With a stellar career of 20 wins and two losses in just over 11 years, Tanaka revealed that he underwent multiple procedures on his eyes after a loss in October 2023. The hernias and extensive surgeries left him unable to spar or compete again, prompting him to retire. Retiring at this stage highlights both his achievements and the toll his career took physically and mentally.