Riku Masuda losses
Over 4 years as a professional, Riku Masuda has compiled a 10-1 (9) record, including four title fights. His only loss came in a title fight against Seiya Tsutsumi.
1. Riku Masuda loses to Seiya Tsutsumi via unanimous decision
On August 30, 2023 Riku Masuda fought Seiya Tsutsumi for the Japan Boxing Commission Japanese bantamweight title. Masuda was 25 years old with a record of 3-0, and Tsutsumi was 27 with a record of 8-0-2. Both Masuda and Tsutsumi were on an undefeated 3-fight winning streak. Masuda lost via unanimous decision. Failed to capture the title. Went the distance with Tsutsumi.