[3] Ishizawa made his professional debut on June 3, 2017, with a second-round knockout of fellow debutante Phongsaphon Panyakum.
These four victories earned him the chance to fight Daiki Tomita for the inaugural Japanese Youth minimumweight championship.
[5] After recovering from his injury, Ishizawa was scheduled to fight the undefeated Yuga Inoue for the inaugural Japanese minimumweight championship on November 10, 2018.
[7] Ishizawa was next scheduled to face Masataka Taniguchi, in a Japanese minimumweight title eliminator match, on September 21, 2019.
[10] Ishizawa was scheduled to face Naoya Haruguchi on October 8, 2021, in a Japanese minimumweight title eliminator match.
[11] Ishizawa was scheduled to face the undefeated Katsuki Mori for the Japanese minumweight title in the main event of "Phoenix Battle 83" at the Korakuen Hall in Tokyo, Japan on January 11, 2022.
[13] Ishizawa is booked to challenge the reigning WBO mini-flyweight champion Masataka Taniguchi on 22 April 2022, in the main event of a Hikari TV broadcast PBX card, which will take place at the Korakuen Hall in Tokyo, Japan.