Yasuhiro Koyama boxer
- bouts
- 10
- won
- 6
- lost
- 4
- draw
- 0
- Status
- inactive
- Division
- light flyweight
- Debut
- 1998-09-11
- Height
- -
- Reach
- -
- Age
- -
- Born
- 1974-03-12
- Death
- -
- Nationality
- Japan
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 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 |
