KY
Light flyweight · Japan
Keiji Yamaguchi 30-8-1 11 KO · 1992–2002
Keiji Yamaguchi was a light flyweight boxer from Japan, born Feb 17, 1974. Record 30-8-1 with 11 knockouts over 1992–2002. World titles: WBA light flyweight (1996). Keiji Yamaguchi last fought Setsuo Segawa on Apr 8, 2002 and lost by TKO in round 3.
Also: Кэйдзи Ямагути · เคจิ ยะมะงุชิ · 山口圭司 +13 more Кейдзи Ямагути · Кейдзи Ямагучи · Кейи Ямагуси · Ямагуси Кейи · Ямагуси, Кейи · Ямагути Кейдзи · Ямагути Кэйдзи · Ямагути, Кейдзи · Ямагути, Кэйдзи · Ямагучи Кейдзи · Ямагучи, Кейдзи · เคจิ ยามากูชิ · เคอิจิ ยามากูชิ
Born Feb 17, 1974
Country 🇯🇵 Japan
Debut May 11, 1992
Career 1992–2002
Rounds boxed 279
KO share 37%
Born in Hakodate, Japan
Titles WBA light flyweight · 1996
Boxerbook rating 1682 ± 213 · inactive since Apr 2002Why here › Confirmed bouts 7 of 39
Career record Record
30-8-1, 11 KOs · 1992–2002
Last result
The record 39 bouts, 1992–2002, newest first. Records under each bout are both boxers going in.
Bouts by source: Wikipedia (ja) · 39, English Wikipedia · 6
L
TKO 3
Yamaguchi 30-7-1 · Segawa —
L
For WBC International super-flyweight title TKO 1/12 · Araneta Coliseum, Quezon City, 🇵🇭
Yamaguchi 30-6-1 · Peñalosa 43-3-2
L
KO 4
Yamaguchi 30-5-1 · Arinaga —
W
Hyeon-sun Kim
DEC 10/10
Yamaguchi 29-5-1 · Kim —
D
Hyeon-sun Kim
DEC 10/10
Yamaguchi 29-5-0 · Kim —
L
For WBC super flyweight title UD 12/12 · Kokugikan, Tokyo, 🇯🇵
Yamaguchi 29-4-0 · In-joo 15-0-0
W
Na Doun
KO 3
Yamaguchi 28-4-0 · Doun —
W
Takayuki Akasawa
UD 10/10
Yamaguchi 27-4-0 · Akasawa —
W
DEC 10/10
Yamaguchi 26-4-0 · Kabato —
L
Japanese super flyweight title UD 10/10
Yamaguchi 26-3-0 · Nago 12-0-0
W
Rudy Edanio
DEC 10/10
Yamaguchi 25-3-0 · Edanio —
W
Vicente Adreias
TKO 1
Yamaguchi 24-3-0 · Adreias —
W
Wataru Kaido
TKO 7
Yamaguchi 23-3-0 · Kaido —
L
WBA world flyweight title TKO 6
Yamaguchi 23-2-0 · Bonilla —
W
Jojo Torres
KO 5
Yamaguchi 22-2-0 · Torres —
W
Marlon Carillo
UD 10/10
Yamaguchi 21-2-0 · Carillo —
L
For WBA light flyweight title TKO 2/12 · Prefectural Gymnasium, Osaka, 🇯🇵
Yamaguchi 21-1-0 · Sitbangprachan 15-1-0
W
For WBA light flyweight title UD 12/12 · Central Gymnasium, Osaka, 🇯🇵
Yamaguchi 20-1-0 · Murillo 34-3-0
W
Won WBA light flyweight title SD 12/12 · Prefectural Gymnasium, Osaka, 🇯🇵
Yamaguchi 19-1-0 · Murillo 34-2-0
W
Christopher Sagido
DEC 10/10
Yamaguchi 18-1-0 · Sagido —
Show all 39 bouts L
For WBA light-flyweight title SD 12/12 · Prefectural Gymnasium, Osaka, 🇯🇵
Yamaguchi 18-0-0 · Hi-yong 18-1-0
W
Hoeven Holda
UD 6/6
Yamaguchi 17-0-0 · Holda —
W
Satoru Abe
Japanese title, 3rd defence MD 10/10
Yamaguchi 16-0-0 · Abe —
W
Daiki Sakakibara
Japanese title, 2nd defence DEC 10/10
Yamaguchi 15-0-0 · Sakakibara —
W
Sho Tenma
Japanese title, 1st defence TKO 6
Yamaguchi 14-0-0 · Tenma —
W
Katsunori Zakabi
Vacant Japanese light flyweight title UD 10/10
Yamaguchi 13-0-0 · Zakabi —
W
Sammy Tyson
TKO 3
Yamaguchi 12-0-0 · Tyson —
W
Nilo Anosa
DEC 10/10
Yamaguchi 11-0-0 · Anosa —
W
Texas Mac Gómez
DEC 10/10
Yamaguchi 10-0-0 · Gómez —
W
Jae-un Kim
KO 7
Yamaguchi 9-0-0 · Kim —
W
Lee Escobito
UD 6/6
Yamaguchi 8-0-0 · Escobito —
W
Seon-ho Kim
DEC 10/10
Yamaguchi 7-0-0 · Kim —
W
Joe Constantin
UD 10/10
Yamaguchi 6-0-0 · Constantin —
W
Dash Toho
KO 2
Yamaguchi 5-0-0 · Toho —
W
George Ubaldo
DEC 8/8
Yamaguchi 4-0-0 · Ubaldo —
W
Kenji Takaoka
KO 5
Yamaguchi 3-0-0 · Takaoka —
W
Koji Ishikawa
KO 1
Yamaguchi 2-0-0 · Ishikawa —
W
Takayuki Onoda
DEC 4/4
Yamaguchi 1-0-0 · Onoda —
W
Fumikazu Onishi
KO 1
Yamaguchi 0-0-0 · Onishi —
Ratings now Not in any current ranking.
World titles
Facts
What is Keiji Yamaguchi's record? Keiji Yamaguchi's professional record is 30-8-1 with 11 knockouts.
Who did Keiji Yamaguchi fight last? Keiji Yamaguchi last fought Setsuo Segawa on Apr 8, 2002 and lost by TKO in round 3.
Which world titles has Keiji Yamaguchi held? Keiji Yamaguchi has held 1 world title reign: WBA light flyweight (1996). Sources Boxerbook ID 9274 · permanent link boxerbook.com/id/9274 . Wikidata (CC0), English Wikipedia (CC BY-SA). Last fetched: 2026-10-12. Spot a mistake? Every bout page has a link to report it.