Retsu Kosaka boxer
- bouts
- 17
- won
- 10
- lost
- 7
- draw
- 0
- Status
- active
- Division
- super feather
- Debut
- 2015-04-26
- Height
- 5′ 9″/175cm
- Reach
- -
- Age
- 21
- Born
- 1998-01-31
- Death
- -
- Nationality
- Japan
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 2021-10-14 | Ryo Sagawa | WWWWWL | Korakuen Hall | LOST Technical knockout |
| 2021-05-30 | Noboru Osato | WWLLWW | Art Center, Kobe | LOST Unanimous decision |
| 2019-11-17 | Hikaru Matsuoka | WLWWWL | Sanda Hotel, Sanda | LOST Majority decision |
| 2019-06-16 | Anshori Anhar Pitulay | LLLLWL | Big Wave, Wakayama | WIN Technical knockout |
| 2018-08-05 | Ken Osato | WWWWWL | L-Theatre, Osaka | LOST Unanimous decision |
| 2018-04-28 | Koichi Ito | WDLLWL | Central Gym, Kobe | WIN Unanimous decision |
| 2017-08-22 | Tsuyoshi Tameda | WWWWLL | Korakuen Hall | LOST Corner retirement |
| 2017-05-16 | Ryo Sagawa | W | Korakuen Hall | WIN Technical knockout |
| 2017-02-12 | Yuki Kumazoe | WLLLLL | NTT Cred Hall, Hiroshima | LOST Unanimous decision |
| 2016-08-28 | Ken Osato | LWWDWW | Big Rose, Fukuyama | LOST Majority decision |
| 2016-05-16 | Jidtiwat Johphromma | LLLLW | Central Gym, Kobe | WIN Technical knockout |
| 2016-03-04 | Yuto Nagano | WWWWWL | Shimazu Arena, Kyoto | WIN Unanimous decision |
| 2015-10-13 | Takahiro Shinoda | WLL | Central Gym, Kobe | WIN Split-decision |
| 2015-08-09 | Ryusuke Hoashi | WLLLLL | L-Theatre, Osaka | WIN Unanimous decision |