Kai Ishizawa

Ishizawa played soccer and practiced karate in elementary school and took up boxing in the first grade of junior high school.[2] He was the captain of the boxing club in Buso Junior High School.[3]

Ishizawa graduated from the Nippon Sport Science University.[4]

Ishizawa made his professional debut on June 3, 2017, with a second-round knockout of fellow debutante Phongsaphon Panyakum.[5] Ishizawa followed this up with stoppage victories of Yoshimitsu Kushibe on August 4, 2017, Narathip Sungsut on January 30, 2018, and Tatsuro Nakashima on August 4, 2018. These four victories earned him the chance to fight Daiki Tomita for the inaugural Japanese Youth minimumweight championship. He was later forced to withdraw due to an injury.[6]

After recovering from his injury, Ishizawa was scheduled to fight the undefeated Yuga Inoue for the inaugural Japanese minimumweight championship on November 10, 2018. He won the fight by a sixth-round technical knockout.[7]

Ishizawa was scheduled to fight the Indonesian national mini-flyweight champion Silem Serang on June 1, 2019. He won the fight by a fourth-round technical knockout, stopping Serang with eight seconds left in the round.[8] Ishizawa was next scheduled to face Masataka Taniguchi, in a Japanese minimumweight title eliminator match, on September 21, 2019. Taniguchi won the fight by unanimous decision, with scores of 77–74, 77-74 and 78–74.[9]

Ishizawa rebounded from his first professional loss with a sixth-round technical knockout of Masashi Tada on October 13, 2020.[10] Ishizawa was next scheduled to fight Yuni Takada for the Japanese Youth minimumweight title on April 21, 2021. He won the fight by majority decision, with scores of 78–74, 76-76 and 79–73.[11]

Ishizawa was scheduled to face Naoya Haruguchi on October 8, 2021, in a Japanese minimumweight title eliminator match. He won the fight by a fourth-round technical knockout.[12]