Jack O'Brien boxer
- bouts
- 5
- won
- 1
- lost
- 3
- draw
- 1
- Status
- inactive
- Division
- light heavyweight
- Debut
- 1943-11-13
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Australia
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1945-01-20 | Dan Munro | debut | Sydney Stadium, Sydney | LOST Points |
| 1944-02-12 | Tom Laming | WLWW | Sydney Stadium, Sydney | LOST Points |
| 1943-12-04 | Bert Lamings | D | Sydney Stadium, Sydney | LOST Technical knockout |
| 1943-11-27 | Alby Ward | LWW | Sydney Stadium, Sydney | DRAW Points |
| 1943-11-13 | Sid Bradley | WLLLDW | Sydney Stadium, Sydney | WIN Technical knockout |
