Super bantamweight · Japan
Ryōsuke Iwasa 31-6-0 21 KO · 2008–2023
Photo: Sports.uz, CC BY 3.0 via Wikimedia Commons
Ryōsuke Iwasa is a super bantamweight boxer from Japan, born Dec 26, 1989. Record 31-6-0 with 21 knockouts over 2008–2023. World titles: IBF super bantamweight (2017–2018). Ryōsuke Iwasa last fought Japhethlee Llamido on Apr 15, 2023 and lost by UD over 8 rounds.
Also: Іваса Рьосуке · Рёсукэ Иваса · 岩佐亮佑 +3 more Ryosuke Iwasa · Ryousuke Iwasa · Иваса, Рёсукэ
Born Dec 26, 1989
Country 🇯🇵 Japan
Stance Southpaw
Reach 180 cm
Debut Aug 2, 2008
Career 2008–2023
Rounds boxed 223
KO share 68%
Born in Kashiwa, Chiba, Japan
Titles IBF super bantamweight · 2017–2018
Boxerbook rating 1917 ± 131 · inactive since Apr 2023Why here › Confirmed bouts 35 of 37 · 33 official
Record and next fight Record
31-6-0, 21 KOs · 2008–2023
Next fight
No next fight confirmed
Last result L
UD 8/8 · Paradise City Plaza, Incheon, 🇰🇷
The record 37 bouts, 2008–2023, newest first. Records under each bout are both boxers going in.
Bouts by source: English Wikipedia · 34, Wikipedia (ja) · 33, Japan Boxing Commission — 試合報告書 · 27, IBF/USBA Results · 7, Wikipedia (ru) · 3, WBA Fights Master Scores · 1, California State Athletic Commission — Results (archive) · 1
L
UD 8/8 · Paradise City Plaza, Incheon, 🇰🇷
Iwasa 31-5-0 · Llamido 16-0-0
W
KO 4/10 · Korakuen Hall, 🇯🇵
Iwasa 30-5-0 · Servania 34-4-0
W
KO 4/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 29-5-0 · Servania 34-3-0
L
For WBA and IBF super-bantamweight titles TKO 5/12 · Humo Arena, Tashkent, 🇺🇿
Iwasa 29-4-0 · Akhmadaliev 8-0-0
W
Won IBF interim super-bantamweight title TKO 11/12 · Barclays Center, Brooklyn, 🇺🇸
Iwasa 28-4-0 · Tapales 35-2-0
W
Cesar Juarez
TD 10/12 · Microsoft Theater, Los Angeles, 🇺🇸
Iwasa 27-4-0 · Juarez —
L
Lost IBF super-bantamweight title UD 12/12 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 27-3-0 · Doheny 20-0-0
W
Ernesto Saulong
Retained IBF super-bantamweight title UD 10/12 · Ryogoku Kokugikan, Tokyo, 🇯🇵
Iwasa 26-3-0 · Saulong —
W
Won IBF super bantamweight title TKO 6/12 · EDION Arena Osaka, Osaka, 🇯🇵
Iwasa 25-3-0 · Oguni 22-1-2
W
Glenn Medura
TKO 3/8 · Ryogoku Kokugikan, Tokyo, 🇯🇵
Iwasa 24-3-0 · Medura —
W
Luis Rosa
KO 3 · Foxwoods Casino, 🇺🇸
Iwasa 23-3-0 · Rosa —
W
KO 3/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 22-3-0 · Kaewmanee —
W
KO 7/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 21-3-0 · Tubieron 19-6-2
W
Marlon Arcilla
TD 5/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 20-3-0 · Arcilla —
L
For IBF interim bantamweight title TKO 6/12 · Whitchurch Sports Centre, Bristol, 🇬🇧
Iwasa 20-2-0 · Haskins 32-3-0
L
For interim IBF bantamweight title TKO 6/12 · Whitchurch Leisure Centre, Bristol, 🇬🇧
Iwasa 20-1-0 · Haskins 31-3-0
W
Ricardo Roa
TKO 2/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 19-1-0 · Roa —
W
Rommy Wassar
KO 2/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 18-1-0 · Wassar —
W
Richard Pumicpic
Retained OPBF bantamweight title MD 12/12 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 17-1-0 · Pumicpic —
W
Won OPBF bantamweight title TKO 5/12 · Ryogoku Kokugikan, Tokyo, 🇯🇵
Iwasa 16-1-0 · Shiino 10-2-0
Show all 37 bouts W
Jecker Buhawe
UD 10/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 15-1-0 · Buhawe —
W
UD 10/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 14-1-0 · Yap —
W
UD 10/10 · Tokyo International Forum, Tokyo, 🇯🇵
Iwasa 13-1-0 · Mora 23-2-0
W
Retained Japanese bantamweight title TKO 7/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 12-1-0 · Masuda —
W
Yuki Murai
Retained Japanese bantamweight title KO 1/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 11-1-0 · Murai —
W
Jerope Mercado
Won Japanese bantamweight title UD 10/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 10-1-0 · Mercado —
W
Rasmanudin
KO 2/8 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 9-1-0 · Rasmanudin —
L
For Japanese bantamweight title TKO 10/10 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 9-0-0 · Yamanaka 13-0-2
W
Kinshiro Usui
TKO 4/8 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 8-0-0 · Usui —
W
Yuki Sato
TKO 2/8 · Korakuen Hall, 🇯🇵
Iwasa 6-0-0 · Sato —
W
Yuki Sato
TKO 2/8 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 6-0-0 · Sato —
W
UD 8/8 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 5-0-0 · Tampus —
W
Falazona Fidal
TKO 7/8 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 4-0-0 · Fidal —
W
Worawut Muangsima
KO 2/8 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 3-0-0 · Muangsima —
W
Ginzo Hanaki
TKO 1/6 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 2-0-0 · Hanaki —
W
Edgar Allende
UD 6/6 · National Yoyogi Gymnasium No. 1, Tokyo, 🇯🇵
Iwasa 1-0-0 · Allende —
W
Shinya Takahashi
TKO 5/6 · Korakuen Hall, Tokyo, 🇯🇵
Iwasa 0-0-0 · Takahashi —
Ratings now Not in any current ranking.
World titles
Facts
What is Ryōsuke Iwasa's record? Ryōsuke Iwasa's professional record is 31-6-0 with 21 knockouts.
When is Ryōsuke Iwasa's next fight? No next fight is confirmed as of 17 Oct 2026.
Who did Ryōsuke Iwasa fight last? Ryōsuke Iwasa last fought Japhethlee Llamido on Apr 15, 2023 and lost by UD over 8 rounds.
Which world titles has Ryōsuke Iwasa held? Ryōsuke Iwasa has held 1 world title reign: IBF super bantamweight (2017–2018). Sources Boxerbook ID 1388 · permanent link boxerbook.com/id/1388 . Wikidata (CC0), English Wikipedia (CC BY-SA), photo from Wikimedia Commons. Last fetched: 2026-10-12. Spot a mistake? Every bout page has a link to report it.
