Jack O'Brien boxer
- bouts
- 7
- won
- 4
- lost
- 2
- draw
- 1
- Status
- inactive
- Division
- welterweight
- Debut
- 1930-08-20
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Australia
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1931-08-01 | Harry Holmes | LWLWWW | West Melbourne Stadium, Melbourne | WIN Technical knockout |
| 1931-06-12 | Mike O'Connor | LWLWDW | Fitzroy Stadium, Melbourne | WIN Points |
| 1931-04-10 | Tom Maloney | WWLWLL | Fitzroy Stadium, Melbourne | LOST Technical knockout |
| 1931-03-13 | Jack 'Cyclone' Darcy | WWWWLL | Fitzroy Stadium, Melbourne | WIN Points |
| 1930-12-24 | Alan Rickards | WWW | Fitzroy Stadium, Fitzroy, Melbourne | DRAW Points |
| 1930-09-20 | Jack Wilson | WWW | West Melbourne Stadium, Melbourne | WIN Points |
| 1930-08-20 | Jack Wilson | WW | West Melbourne Stadium, Melbourne | LOST KO |