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Kosei Tanaka has had just a single loss inhis professional boxing career so far. He suffered his first loss against Kazuto Ioka via 8th round TKO on December 31, 2020, which ended his 15-fight win streak. Ioka is the only boxer to beat Tanaka.
The first and only loss in Kosei Tanaka's career so far. Tanaka lost to fellow Japanese boxer Kazuto Ioka via 8th round TKO on . He was fighting for Ioka's super-flyweight WBO title, he was 25 years old with a record of 15-0. Ioka was 31 years old with a record of 25-2.