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Super lightweight · Japan
Koichi Aso 26-11-1 16 KO · 2006–2023
Updated Oct 14, 2026 · Sources: Wikidata, Wikipedia (ja), Japan Boxing Commission — 試合報告書
Koichi Aso is a super lightweight boxer from Japan. Record 26-11-1 with 16 knockouts over 2006–2023. Koichi Aso last fought Toshito Ohno on Mar 20, 2023 and lost by SD over 8 rounds.
Also: 麻生興一
Born —
Country 🇯🇵 Japan
Debut Jun 28, 2006
Career 2006–2023
Rounds boxed 221
KO share 62%
Titles OPBF title 2021
Boxerbook rating 1423 ± 145 · inactive since Mar 2023Why here › Confirmed bouts 30 of 38 · 30 official
Record and next fight Record
26-11-1, 16 KOs · 2006–2023
Next fight
No next fight confirmed
Last result L
Toshito Ohno
SD 8/8 · Korakuen Hall, 🇯🇵
The record 38 bouts, 2006–2023, newest first. Records under each bout are both boxers going in.
Bouts by source: Wikipedia (ja) · 37, Japan Boxing Commission — 試合報告書 · 30
L
Toshito Ohno
SD 8/8 · Korakuen Hall, 🇯🇵
Aso 26-10-1 · Ohno —
L
OPBF super lightweight title TKO 2/12 · Korakuen Hall, 🇯🇵
Aso 26-9-1 · Kondō 33-10-2
W
TKO 9/12 · Korakuen Hall, 🇯🇵
Aso 25-9-1 · Naitō 23-2-0
W
Shogo Yamaguchi
MD 8/8 · Fujisan Messe, 🇯🇵
Aso 24-9-1 · Yamaguchi —
L
Tatsuya Yanagi
UD 8/8 · Sumida Ward General Gymnasium, 🇯🇵
Aso 24-8-1 · Yanagi —
W
Kuniaaki Sato
TD 6/8 · Korakuen Hall, 🇯🇵
Aso 23-8-1 · Sato —
L
Japanese super lightweight title UD 10/10 · Korakuen Hall, 🇯🇵
Aso 23-7-1 · Hosokawa 21-8-4
W
Japanese title, 1st defence TKO 10/10 · Korakuen Hall, 🇯🇵
Aso 22-7-1 · Konno —
W
Vacant Japanese super lightweight title TKO 8/10 · Korakuen Hall, 🇯🇵
Aso 21-7-1 · Matsuyama —
L
Japanese title, 4th defence TKO 7/10 · Korakuen Hall, 🇯🇵
Aso 21-6-1 · Okada 11-0-0
W
Tatsuya Miyazaki
TKO 8/8 · Korakuen Hall, 🇯🇵
Aso 20-6-1 · Miyazaki —
W
Gabriel Royo
TKO 7/8 · Korakuen Hall, 🇯🇵
Aso 19-6-1 · Royo —
W
Gabriel Royo
TKO 7
Aso 18-6-1 · Royo —
L
Japanese title, 1st defence UD 10/10 · Korakuen Hall, 🇯🇵
Aso 18-5-1 · Okada 8-0-0
W
Takashi Inagaki
KO 1
Aso 17-5-1 · Inagaki —
W
Satoshi Momota
TKO 6
Aso 16-5-1 · Momota —
W
Moon-hyun Yun
TD 8
Aso 15-5-1 · Yun —
L
Jung-hoon Ryang
UD 8/8
Aso 15-4-1 · Ryang —
W
Tomohiko Sakai
UD 8/8
Aso 14-4-1 · Sakai —
W
Juan Castillo Iha
UD 6/6
Aso 13-4-1 · Iha —
Show all 38 bouts L
Tsuyoshi Ozawa
UD 8/8 · Korakuen Hall, 🇯🇵
Aso 13-3-1 · Ozawa —
L
TKO 1/8 · Korakuen Hall, 🇯🇵
Aso 13-2-1 · Iwabuchi 16-3-0
W
Yoshitaka Katanami
UD 6/6 · Korakuen Hall, 🇯🇵
Aso 12-2-1 · Katanami —
W
Kazuyoshi Kumano
TKO 7/8 · Korakuen Hall, 🇯🇵
Aso 11-2-1 · Kumano —
W
Yusuke Kikuchi
TKO 8/8 · Korakuen Hall, 🇯🇵
Aso 10-2-1 · Kikuchi —
L
Taisho Ozawa
TKO 2/8 · Korakuen Hall, 🇯🇵
Aso 10-1-1 · Ozawa —
W
Hiromi Morishita
TKO 4/8 · Korakuen Hall, 🇯🇵
Aso 9-1-1 · Morishita —
W
Kento Nakamura
TD 4/6 · Korakuen Hall, 🇯🇵
Aso 8-1-1 · Nakamura —
W
Hiroshi Abe
TKO 4/6 · Korakuen Hall, 🇯🇵
Aso 7-1-1 · Abe —
D
SD 5/5 · Korakuen Hall, 🇯🇵
Aso 7-1-0 · Hosokawa 6-3-3
W
Ho-chul Lee
UD 4/4 · Korakuen Hall, 🇯🇵
Aso 6-1-0 · Lee —
W
Tomoyuki Tsushima
TKO 3/4 · Korakuen Hall, 🇯🇵
Aso 5-1-0 · Tsushima —
W
Masamoto Kotake
MD 4/4 · Korakuen Hall, 🇯🇵
Aso 4-1-0 · Kotake —
W
Takahiro Abe
SD 4/4 · Korakuen Hall, 🇯🇵
Aso 3-1-0 · Abe —
L
Akinori Kuramata
TKO 2/4 · Korakuen Hall, 🇯🇵
Aso 3-0-0 · Kuramata —
W
Yuki Amauchi
TKO 3/4 · Korakuen Hall, 🇯🇵
Aso 2-0-0 · Amauchi —
W
Nobuya Kasai
TKO 3/4 · Korakuen Hall, 🇯🇵
Aso 1-0-0 · Kasai —
W
Yoshitaka Yamaguchi
TKO 4
Aso 0-0-0 · Yamaguchi —
Ratings now Not in any current ranking.
World titles No world title reigns recorded.
Facts
What is Koichi Aso's record? Koichi Aso's professional record is 26-11-1 with 16 knockouts.
When is Koichi Aso's next fight? No next fight is confirmed as of 18 Oct 2026.
Who did Koichi Aso fight last? Koichi Aso last fought Toshito Ohno on Mar 20, 2023 and lost by SD over 8 rounds. Sources Boxerbook ID 20613 · permanent link boxerbook.com/id/20613 . Wikidata (CC0), English Wikipedia (CC BY-SA). Last fetched: 2026-10-12. Spot a mistake? Every bout page has a link to report it.