Koichi Yamasaki boxer
- bouts
- 9
- won
- 4
- lost
- 3
- draw
- 1
- Status
- inactive
- Division
- super bantamweight
- Debut
- 2004-03-13
- Height
- 5′ 8″/173cm
- Reach
- -
- Age
- -
- Born
- 1985-01-10
- Death
- -
- Nationality
- Japan
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 2010-05-22 | Toru Uemura | LDWWLL | Central Gym, Kobe | DRAW Split-decision |
| 2009-07-12 | Tomohiro Hosokawa | WWWWW | IMP Hall, Osaka | LOST Split-decision |
| 2009-03-21 | Kentaro Oku | WDLWLL | Incubation Center, Amagasaki | WIN Unanimous decision |
| 2008-11-14 | Yasutomo Itakura | LLDWLW | Prefectural Gymnasium, Osaka | WIN KO |
| 2008-08-30 | Shinichiro Morikawa | WWWDW | Prefectural Gymnasium, Osaka | LOST KO |
| 2008-07-20 | Akira Naito | WLW | IMP Hall, Osaka | WIN Split-decision |
| 2008-04-05 | Koji Nakamura | WLW | Incubation Center, Amagasaki | NC No Contest |
| 2007-11-23 | Shinichiro Morikawa | WW | Kobe Fashion Mart, Kobe | LOST Technical knockout |
| 2004-03-13 | Masahiro Ishikawa | debut | Central Gym, Osaka | WIN KO |