Four-division world champion Kosei Tanaka retires at 29 due to eye injuries | CVHD JAPAN Four-division world champion Kosei Tanaka retires at 29 due to eye injuries | CVHD Editor June 5, 2025 Tanaka is the fastest boxer to earn belts at four different weights. Read More Read more about Four-division world champion Kosei Tanaka retires at 29 due to eye injuries | CVHD
