Here is a list of Tsutsumi's best fights.
On October 13, 2024 Seiya Tsutsumi fought Takuma Inoue in a bantamweight world-title fight for Inoue's WBA title. Tsutsumi was 28 years old and with a record of 12-0-2 (8), and Inoue was 28 years old and with a record of 20-1 (5). Tsutsumi won the fight via 12-round unanimous decision and is crowned the new bantamweight world champion.
On December 17, 2025 Seiya Tsutsumi met Nonito Donaire in a bantamweight (WBA) world-title defense fight. Tsutsumi was 29 years old and with a record of 13-0-3 (8), and Donaire was 43 years old and with a record of 43-8 (28). Tsutsumi won the fight via 12-round split decision and successfully defended his title.
