Masao Koizumi boxer
- bouts
- 5
- won
- 0
- lost
- 5
- draw
- 0
- Status
- inactive
- Division
- super featherweight
- Debut
- 2001-10-26
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Japan
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 2004-01-26 | Shotaro Ono | WWDLLL | Korakuen Hall | LOST Unanimous decision |
| 2003-10-27 | Mitsunori Sugiura | LDLLW | Korakuen Hall | LOST Technical knockout |
| 2002-12-07 | Katsunobu Suzuki | LW | Korakuen Hall | LOST Unanimous decision |
| 2002-04-01 | Shotaro Ono | LLWW | Korakuen Hall | LOST Technical knockout |
| 2001-10-26 | Eiichi Matsumoto | L | Korakuen Hall | LOST KO |