On December 31, 2020, a 25-year-old Kosei Tanaka (15-0, 9 KOs) got a shot at the super-flyweight WBO title held by 31-year-old fellow Japanese boxer Kazuto Ioka (25-2, 14 KOs).
Tanaka came in to the fight on a 15-fight win streak with a 60% KO rate, and was fighting after a gap of 1 year. Ioka was on a 2-fight win streak with a 51% KO rate, and fighting after a layoff of 1 year.
Kazuto Ioka stopped Kosei Tanaka via TKO in the 8th round of the 12-round world-title fight, and successfully defended his WBO super-flyweight title. Ioka improves his record to 26-2 (15 KOs), while Tanaka adds a loss to his record at 15-1.