Yasuhiro Koyama boxeador
- luta
- 10
- vitória
- 6
- derrota
- 4
- empate
- 0
- Estado
- inactive
- divisão
- light flyweight
- Estreia
- 1998-09-11
- Altura
- -
- Alcance
- -
- Idade
- -
- Born
- 1974-03-12
- Death
- -
- Nascimento
- Japan
| Data | Adversário | Últimos resultados dos adversários | Lugar | Resultado |
|---|---|---|---|---|
| 2003-07-21 | Masato Hatakeyama | LWWDWW | Korakuen Hall | LOST Technical knockout |
| 2003-03-15 | Naoya Kishida | DWDWLW | Korakuen Hall | WIN Majority decision |
| 2002-11-01 | Tomoya Miyauchi | WWLLL | Korakuen Hall | WIN Unanimous decision |
| 2002-09-11 | Kazunari Omizu | WLL | Korakuen Hall | WIN Unanimous decision |
| 2000-08-22 | Shingo Yamaguchi | WWWWDW | LOST Points |
|
| 2000-03-28 | Ryo Kitano | WWLD | LOST Points |
|
| 1999-12-07 | Kazuhisa Takahashi | LDLL | WIN Points |
|
| 1999-05-27 | Masami Yanagisawa | DLWLWL | WIN Points |
|
| 1999-02-23 | Shunsuke Fukuda | WLLWL | Korakuen Hall | WIN KO |
| 1998-09-11 | Takashi Kawakami | WLL | Obihiro | LOST Technical knockout |