Jack O'Brien boxer
- bouts
- 3
- won
- 2
- lost
- 1
- draw
- 0
- Status
- inactive
- Division
- heavyweight
- Debut
- 1921-06-17
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1932-02-23 | Ernest Hollopeter | WW | Armory, Indianapolis | WIN Points |
| 1932-01-21 | Joe Brian | LLWLLL | Tomlinson Hall, Indianapolis | WIN Points |
| 1921-06-17 | Ben Miller | LWWWW | Western League Park, Oklahoma City | LOST KO |