On December 31, 2020, the 31-year-old WBO super-flyweight world champion, Kazuto Ioka (25-2, 14 KOs), faced a 25-year-old fellow Japanese boxer Kosei Tanaka (15-0, 9 KOs), in a title defense fight.
Ioka came in to the fight on a 2-fight win streak with a 51% KO rate, and was fighting after a gap of 1 year. Tanaka was on a 15-fight win streak with a 60% 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.
On April 22, 2015, a 26-year-old Kazuto Ioka (16-1, 10 KOs) got a shot at the WBA (Regular) flyweight title held by 31-year-old Argentinian boxer Juan Carlos Reveco (35-1, 19 KOs).
Ioka came in to the fight on a 2-fight win streak with a 58% KO rate, and was fighting after a gap of 3 months and 22 days. Reveco was on a 18-fight win streak with a 52% KO rate, and fighting after a layoff of 4 months and 3 days.
Kazuto Ioka defeated Juan Carlos Reveco via majority decision and wins the WBA (Regular) title. Ioka improves his record to 17-1, while Reveco adds a loss to his record at 35-2.
On July 13, 2022, Kazuto Ioka and Donnie Nietes met again in a rematch.
Ioka came in to the fight on a 5-fight win streak with a 50% KO rate, and was fighting after a gap of 6 months and 13 days. Nietes was on a 0-fight win streak with a 46% KO rate, and fighting after a layoff of 7 months and 2 days.
Kazuto Ioka defeated Donnie Nietes via unanimous decision in the rematch and successfully defended his WBO super-flyweight title. Ioka improves his record to 29-2, while Nietes adds a loss to his record at 43-2-6.
On September 11, 2013, the 24-year-old WBA (Regular) light-flyweight world champion, Kazuto Ioka (12-0, 8 KOs), faced a 28-year-old Thai boxer Kwanthai Sithmorseng (41-1-1, 21 KOs), in a title defense fight.
Ioka came in to the fight on a 12-fight win streak with a 66% KO rate, and was fighting after a gap of 4 months and 3 days. Sithmorseng was on a 12-fight win streak with a 48% KO rate, and fighting after a layoff of 2 months and 6 days.
Kazuto Ioka stopped Kwanthai Sithmorseng via KO in the 7th round of the 12-round world-title fight, and successfully defended his WBA (Regular) light-flyweight title. Ioka improves his record to 13-0 (9 KOs), while Sithmorseng adds a loss to his record at 41-2-1.
On December 31, 2011, the 22-year-old WBC strawweight world champion, Kazuto Ioka (8-0, 5 KOs), faced Yodgoen Tor Chalermchai, in a title defense fight.
Ioka came in to the fight on a 8-fight win streak with a 62% KO rate, and was fighting after a gap of 4 months and 21 days.
Kazuto Ioka made quick work of Yodgoen Tor Chalermchai, stopping the challenger via TKO in the 1st. Ioka improves his record to 9-0 (6 KOs)
On February 11, 2011, a 21-year-old Kazuto Ioka (6-0, 4 KOs) got a shot at the WBC strawweight title held by Oleydong Sithsamerchai.
Ioka came in to the fight on a 6-fight win streak with a 66% KO rate, and was fighting after a gap of 4 months and 1 day.
Kazuto Ioka stopped the champion via TKO in the 5th round of the 12-round world-title fight, winning the first world title of his career, and is crowned the new WBC strawweight champion. Ioka improves his record to 7-0 (5 KOs)
On December 31, 2012, 23-year-old Kazuto Ioka (10-0, 6 KOs) and José Alfredo Rodríguez fought for the vacant WBA (Regular) light-flyweight title.
Ioka came in to the fight on a 10-fight win streak with a 60% KO rate, and was fighting after a gap of 6 months and 11 days.
Kazuto Ioka stopped José Alfredo Rodríguez via TKO in the 6th round of the 12-round world-title fight. Ioka improves his record to 11-0 (7 KOs)
On December 31, 2016, the 27-year-old WBA flyweight world champion, Kazuto Ioka (20-1, 12 KOs), faced Stamp Kiatniwat, in a title defense fight.
Ioka came in to the fight on a 6-fight win streak with a 57% KO rate, and was fighting after a gap of 5 months and 11 days.
Kazuto Ioka stopped Stamp Kiatniwat via TKO in the 7th round of the 12-round world-title fight, and successfully defended his WBA flyweight title. Ioka improves his record to 21-1 (13 KOs)
On December 31, 2015, Kazuto Ioka and Juan Carlos Reveco met again in a rematch.
Ioka came in to the fight on a 4-fight win streak with a 52% KO rate, and was fighting after a gap of 3 months and 4 days. Reveco was on a 1-fight win streak with a 50% KO rate, and fighting after a layoff of 3 months and 5 days.
In the rematch, Kazuto Ioka stopped Juan Carlos Reveco via TKO in the 11th round of the 12-round world-title fight, and successfully defended his WBA (Regular) flyweight title. Ioka improves his record to 19-1 (11 KOs), while Reveco adds a loss to his record at 36-3.
On June 19, 2019, 30-year-old Kazuto Ioka (23-2, 13 KOs) and 28-year-old Aston Palicte (25-2-1, 21 KOs) fought for the vacant WBO super-flyweight title.
Ioka came in to the fight on a 1-fight losing streak with a 52% KO rate, and was fighting after a gap of 5 months and 19 days. Palicte was on a 1-fight win streak with a 75% KO rate, and fighting after a layoff of 4 months and 19 days.
Kazuto Ioka stopped Aston Palicte via TKO in the 10th round of the 12-round world-title fight. Ioka improves his record to 24-2 (14 KOs), while Palicte adds a loss to his record at 25-3-1.