Jack O'Brien boxer
- bouts
- 14
- won
- 6
- lost
- 6
- draw
- 2
- Status
- inactive
- Division
- bantamweight
- Debut
- 1949-10-14
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Australia
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1950-06-26 | Earl Conway | WLL | Brisbane Stadium, Brisbane | WIN Points |
| 1950-06-23 | Earl Conway | WL | Brisbane Stadium, Brisbane | WIN Points |
| 1950-04-14 | Les Porter | WLLL | Brisbane Stadium, Brisbane | LOST Points |
| 1950-01-27 | Ted Watson | W | Brisbane Stadium, Brisbane | LOST KO |
| 1950-01-13 | Bruce Cole | WWWDL | Brisbane Stadium, Brisbane | WIN Points |
| 1949-12-16 | Ian Garner | LLDDLL | Brisbane Stadium, Brisbane | WIN Points |
| 1949-11-25 | Phil Hansen | LL | Brisbane Stadium, Brisbane | WIN Technical knockout |
| 1949-11-11 | Norm Geebung | debut | Brisbane Stadium, Brisbane | LOST Points |
| 1949-11-04 | Jerry Jones | debut | Brisbane Stadium, Brisbane | LOST Technical knockout |
| 1949-10-31 | Roy Nolan | DW | Brisbane Stadium, Brisbane | DRAW Points |
| 1949-10-24 | Al Manus | WL | Brisbane Stadium, Brisbane | LOST Technical knockout |
| 1949-10-21 | Al Manus | W | Brisbane Stadium, Brisbane | WIN Technical knockout |
| 1949-10-17 | Bill Reynolds | LLLDLD | Brisbane Stadium, Brisbane | LOST Technical knockout |
| 1949-10-14 | Bill Reynolds | WLLLDL | Brisbane Stadium, Brisbane | DRAW Points |