Ryosuke Iwasa has five losses against five opponents on his boxing record. For a list of Iwasa's best fights, refer to "Best fights of Ryosuke Iwasa".
On April 15, 2023 Ryosuke Iwasa faced off against Japhethlee Llamido in a super-bantamweight bout at age 33. He was coming in with a record of 28-5 (18). Iwasa lost the fight via 8-round unanimous decision.
On April 3, 2021 Ryosuke Iwasa fought Murodjon Akhmadaliev in a super-bantamweight world-title fight for Akhmadaliev's WBA (Super) and IBF titles. Iwasa was 31 years old and with a record of 27-4 (17), and Akhmadaliev was 26 years old and with a record of 8-0 (6). Iwasa lost the fight via 5th-round TKO.
On August 16, 2018 Ryosuke Iwasa met TJ Doheny in a super-bantamweight (IBF) world-title defense fight. Iwasa was 28 years old and with a record of 25-3 (16), and Doheny was 31 years old and with a record of 19-0 (14). Iwasa lost the fight via 12-round unanimous decision and lost the title.
On June 13, 2015 Ryosuke Iwasa fought Lee Haskins in a bantamweight world-title fight for Haskins' IBF title. Iwasa was 25 years old and with a record of 19-2 (12). Iwasa lost the fight via 6th-round TKO.
On March 5, 2011 Ryosuke Iwasa faced off against Shinsuke Yamanaka in a bantamweight bout at age 21. He was coming in with a record of 8-1 (6), and Yamanaka was 28 years old and with a record of 13-0-2 (9). Iwasa lost the fight via 10th-round TKO.
