Ko Zwaan boxer
- bouts
- 5
- won
- 2
- lost
- 3
- draw
- 0
- Status
- inactive
- Division
- middleweight
- Debut
- 1956-02-15
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Netherlands
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1956-09-17 | Lothar Heimann | WL | Hotel Krasnapolsky, Amsterdam | LOST Points |
| 1956-07-30 | Herbert Sowa | WWWDWW | Ahoy'-hal, Rotterdam | LOST KO |
| 1956-06-22 | Helmut Mistol | WWW | Ernst Merck Halle | LOST Points |
| 1956-04-17 | Peter Werner | DLWLLL | Hotel Krasnapolsky, Amsterdam | WIN KO |
| 1956-02-15 | Vicky van den Berg | WWWLDL | Hotel Krasnapolsky, Amsterdam | WIN KO |