Battling Jack O'Brien boxer
- bouts
- 7
- won
- 4
- lost
- 1
- draw
- 2
- Status
- inactive
- Division
- flyweight
- Debut
- 1927-10-04
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1930-07-29 | Albert Allen | debut | Waterfront Park, Saint Petersburg | WIN Points |
| 1928-05-28 | Young Granado | WDWLWW | Cuban Club, Tampa | LOST KO |
| 1928-05-01 | Willie Green | LLDD | Waterfront Park, Saint Petersburg | WIN Points |
| 1928-01-10 | Joe Rodriguez | DWWWWW | Waterfront Park, Saint Petersburg | WIN Points |
| 1928-01-05 | Battling Oscar | LL | Waterfront Park, Saint Petersburg | WIN Technical knockout |
| 1927-10-04 | Oscar Ayala | debut | Waterfront Park, Saint Petersburg | DRAW Points |