On April 15, 2023, a 33-year-old Ryosuke Iwasa (28-4, 18 KOs) and Japhethlee Llamido met in the ring.
Iwasa came in to the fight on a 1-fight win streak with a 56% KO rate, and was fighting after a gap of 1 year, 5 months, and 21 days.
Ryosuke Iwasa lost to Japhethlee Llamido via unanimous decision in the 8-round fight, and adds an loss to his record at 28-5.
On April 3, 2021, a 31-year-old Ryosuke Iwasa (27-3, 17 KOs) got a shot at the super-bantamweight WBA (Super) and IBF title held by 26-year-old Uzbek boxer Murodjon Akhmadaliev (8-0, 6 KOs).
Iwasa came in to the fight on a 2-fight win streak with a 56% KO rate, and was fighting after a gap of 1 year, 3 months, and 27 days. Akhmadaliev was on a 8-fight win streak with a 75% KO rate, and fighting after a layoff of 1 year, 2 months, and 4 days.
Murodjon Akhmadaliev stopped Ryosuke Iwasa via TKO in the 5th round of the 12-round world-title fight, and successfully defended his WBA (Super) and IBF super-bantamweight titles. Akhmadaliev improves his record to 9-0 (7 KOs), while Iwasa adds a loss to his record at 27-4.
On August 16, 2018, the 28-year-old IBF super-bantamweight world champion, Ryosuke Iwasa (25-2, 16 KOs), faced a 31-year-old Irish boxer TJ Doheny (19-0, 14 KOs), in a title defense fight.
Iwasa came in to the fight on a 6-fight win streak with a 59% KO rate, and was fighting after a gap of 5 months and 15 days. Doheny was on a 19-fight win streak with a 73% KO rate, and fighting after a layoff of 4 months and 30 days.
TJ Doheny defeated Ryosuke Iwasa via unanimous decision and wins the IBF title — in his first world-title fight. Doheny improves his record to 20-0, while Iwasa adds a loss to his record at 25-3.
On June 13, 2015, a 25-year-old Ryosuke Iwasa (19-1, 12 KOs) and Lee Haskins met in the ring in a bantamweight bout.
Iwasa came in to the fight on a 11-fight win streak with a 60% KO rate, and was fighting after a gap of 3 months and 26 days.
Ryosuke Iwasa lost to Lee Haskins via TKO in the 6th round, and adds an loss to his record at 19-2.
On March 5, 2011, a 21-year-old Ryosuke Iwasa (8-0, 6 KOs) and a 28-year-old fellow Japanese boxer Shinsuke Yamanaka (13-0-2, 9 KOs) met in the ring in a bantamweight bout.
Iwasa came in to the fight on a 8-fight win streak with a 75% KO rate, and was fighting after a gap of 6 months. Yamanaka was on a 8-fight win streak with a 60% KO rate, and fighting after a layoff of 4 months and 9 days.
Shinsuke Yamanaka stopped Ryosuke Iwasa via TKO in the 10th round. Yamanaka improves his record to 14-0-2 (10 KOs), while Iwasa adds a loss to his record at 8-1.