On January 30, 2018, a 21-year-old Kai Ishizawa (2-0, 2 KOs) and Narathip Sungsut met in the ring.
Ishizawa came in to the fight on a 2-fight win streak with a 100% KO rate, and was fighting after a gap of 5 months and 26 days.
Kai Ishizawa stopped Narathip Sungsut via KO in the 1st round. Ishizawa improves his record to 3-0 (3 KOs)
On April 22, 2022, Kai Ishizawa and Masataka Taniguchi met again in a rematch.
Ishizawa came in to the fight on a 4-fight win streak with a 81% KO rate, and was fighting after a gap of 3 months and 11 days. Taniguchi was on a 4-fight win streak with a 55% KO rate, and fighting after a layoff of 4 months and 8 days.
In the rematch, Masataka Taniguchi stopped Kai Ishizawa via TKO in the 11th round of the 12-round world-title fight, and successfully defended his WBO strawweight title. Taniguchi improves his record to 16-3 (11 KOs), while Ishizawa adds a loss to his record at 10-2.
On January 11, 2022, a 25-year-old Kai Ishizawa (9-1, 8 KOs) and Katsuki Mori met in the ring in a strawweight bout.
Ishizawa came in to the fight on a 3-fight win streak with a 80% KO rate, and was fighting after a gap of 3 months and 3 days.
Kai Ishizawa stopped Katsuki Mori via TKO in the 8th round. Ishizawa improves his record to 10-1 (9 KOs)
On October 8, 2021, a 24-year-old Kai Ishizawa (8-1, 7 KOs) and Naoya Haruguchi met in the ring.
Ishizawa came in to the fight on a 2-fight win streak with a 77% KO rate, and was fighting after a gap of 5 months and 17 days.
Kai Ishizawa stopped Naoya Haruguchi via TKO in the 4th round. Ishizawa improves his record to 9-1 (8 KOs)
On June 1, 2019, a 22-year-old Kai Ishizawa (5-0, 5 KOs) and Silem Serang met in the ring.
Ishizawa came in to the fight on a 5-fight win streak with a 100% KO rate, and was fighting after a gap of 6 months and 22 days.
Kai Ishizawa stopped Silem Serang via TKO in the 4th round. Ishizawa improves his record to 6-0 (6 KOs)
On August 4, 2017, a 20-year-old Kai Ishizawa (1-0, 1 KO) and Yoshimitsu Kushibe met in the ring.
Ishizawa came in to the fight on a 1-fight win streak with a 100% KO rate, and was fighting after a gap of 2 months and 1 day.
Kai Ishizawa stopped Yoshimitsu Kushibe via TKO in the 2nd round. Ishizawa improves his record to 2-0 (2 KOs)
On October 13, 2020, a 23-year-old Kai Ishizawa (6-1, 6 KOs) and Masashi Tada met in the ring.
Ishizawa came in to the fight on a 1-fight losing streak with a 85% KO rate, and was fighting after a gap of 1 year and 22 days.
Kai Ishizawa stopped Masashi Tada via TKO in the 6th round. Ishizawa improves his record to 7-1 (7 KOs)
On November 10, 2018, a 21-year-old Kai Ishizawa (4-0, 4 KOs) and Yuga Inoue met in the ring.
Ishizawa came in to the fight on a 4-fight win streak with a 100% KO rate, and was fighting after a gap of 7 months and 2 days.
Kai Ishizawa stopped Yuga Inoue via TKO in the 6th round. Ishizawa improves his record to 5-0 (5 KOs)
On April 8, 2018, a 21-year-old Kai Ishizawa (3-0, 3 KOs) and Tatsuro Nakashima met in the ring.
Ishizawa came in to the fight on a 3-fight win streak with a 100% KO rate, and was fighting after a gap of 2 months and 9 days.
Kai Ishizawa stopped Tatsuro Nakashima via TKO in the 5th round. Ishizawa improves his record to 4-0 (4 KOs)
On April 21, 2021, a 24-year-old Kai Ishizawa (7-1, 7 KOs) and Yuni Takada met in the ring in a strawweight bout.
Ishizawa came in to the fight on a 1-fight win streak with a 87% KO rate, and was fighting after a gap of 6 months and 8 days.
Kai Ishizawa defeated Yuni Takada via majority decision in the 8-round strawweight fight. Ishizawa improves his record to 8-1