Ryosuke Iwasa (28-5, 18) was born in Kashiwa, Chiba, Japan on December 26, 1989. At the age of 18 years on August 2, 2008, he made his professional boxing debut against Shinya Takahashi, winning the fight via 5th-round TKO.
On his 26th career fight at 27 years old, Iwasa became a super-bantamweight world champion on September 13, 2017 after defeating Yukinori Oguni via 6th-round TKO to win the IBF title.
Iwasa's last fight was a 8-round unanimous decision loss to Japhethlee Llamido at age 33 on April 15, 2023. He is on a 1-fight losing streak.
Some of Ryosuke Iwasa's best fights have been against Marlon Tapales, David De La Mora, Genesis Servania, Yukinori Oguni and Yuki Murai.
Iwasa has 5 losses on his boxing record.
| # | Date | Opponent | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|
33 | Apr 15, 2023 33 years, 3 months 28-5 (18) | Japhethlee Llamido | SBT | 8 | UD | LOSS |
32  | Oct 25, 2021 31 years, 9 months 28-4 (18) | 30 years, 2 months 34-3 (16) | SBT | 4 | KO | WIN |
31  | Apr 3, 2021 31 years, 3 months 27-4 (17) | 26 years, 5 months 8-0 (6) | SBT | 5 | TKO | LOSS For WBA (Super), IBF |
30  | Dec 7, 2019 29 years, 11 months 27-3 (17) | 27 years, 8 months 33-2 (15) | SBT | 11 | TKO | WIN Won IBF Interim |
29  | Feb 16, 2019 29 years, 1 months 26-3 (16) | 27 years, 5 months 23-6 (17) | SBT | 9 | TD | WIN |
28  | Aug 16, 2018 28 years, 7 months 25-3 (16) | 31 years, 9 months 19-0 (14) | SBT | 12 | UD | LOSS Lost IBF |
27 | Mar 1, 2018 28 years, 2 months 25-2 (16) | Ernesto Saulong | SBT | 12 | UD | WIN Defended IBF |
26 | Sep 13, 2017 27 years, 8 months 24-2 (16) | Yukinori Oguni | SBT | 6 | TKO | WIN Won IBF |
25 | Mar 2, 2017 27 years, 2 months 23-2 (15) | Glenn Medura | BT | 3 | TKO | WIN |
24 | Jul 12, 2016 26 years, 6 months 22-2 (14) | Aekkawee Kaewmanee | BT | 3 | KO | WIN |
23 | Feb 6, 2016 26 years, 1 months 21-2 (13) | Dennis Tubieron | BT | 7 | KO | WIN |
22 | Nov 24, 2015 25 years, 10 months 20-2 (12) | Marlon Arcilla | BT | 5 | TD | WIN |
21 | Jun 13, 2015 25 years, 5 months 19-2 (12) | Lee Haskins | BT | 6 | TKO | LOSS For IBF Interim |
20 | Feb 18, 2015 25 years, 1 months 19-1 (12) | Ricardo Roa | BT | 2 | TKO | WIN |
19 | Sep 6, 2014 24 years, 8 months 18-1 (11) | Rommy Wassar | BT | 2 | KO | WIN |
18 | Mar 25, 2014 24 years, 2 months 17-1 (10) | Richard Pumicpic | BT | 12 | MD | WIN |
17 | Dec 6, 2013 23 years, 11 months 16-1 (10) | Hiroki Shiino | BT | 5 | TKO | WIN |
16 | Jul 6, 2013 23 years, 6 months 15-1 (9) | Jecker Buhawe | BT | 10 | UD | WIN |
15 | Mar 2, 2013 23 years, 2 months 14-1 (9) | Mark John Yap | BT | 10 | UD | WIN |
14  | Oct 27, 2012 22 years, 10 months 13-1 (9) | 23 years, 4 months 24-2 (17) | BT | 10 | UD | WIN |
13 | Jul 7, 2012 22 years, 6 months 12-1 (9) | Kentaro Masuda | BT | 7 | TKO | WIN |
12 | Mar 3, 2012 22 years, 2 months 11-1 (8) | Yuki Murai | BT | 1 | KO | WIN |
11 | Nov 18, 2011 21 years, 10 months 10-1 (7) | Jerope Mercado | BT | 10 | UD | WIN |
10 | Aug 6, 2011 21 years, 7 months 9-1 (7) | Rasmanudin | BT | 2 | KO | WIN |
9  | Mar 5, 2011 21 years, 2 months 8-1 (6) | 28 years, 4 months 13-0-2 (9) | BT | 10 | TKO | LOSS |
8 | Sep 5, 2010 20 years, 8 months 8-0 (6) | Kinshiro Usui | 4 | TKO | WIN | |
7 | Apr 15, 2010 20 years, 3 months 7-0 (5) | Yuki Sato | 2 | TKO | WIN | |
6 | Jan 16, 2010 20 years 6-0 (4) | Marvin Tampus | 8 | UD | WIN | |
5 | Sep 5, 2009 19 years, 8 months 5-0 (4) | Falazona Fidal | 7 | TKO | WIN | |
4 | May 16, 2009 19 years, 4 months 4-0 (3) | Worawut Muangsima | 2 | KO | WIN | |
3 | Feb 21, 2009 19 years, 1 months 3-0 (2) | Ginzo Hanaki | 1 | TKO | WIN | |
2 | Oct 16, 2008 18 years, 9 months 2-0 (1) | Edgar Allende | 6 | UD | WIN | |
1 | Aug 2, 2008 18 years, 7 months 1-0 (1) | Shinya Takahashi | 5 | TKO | WIN |
