Jack O'Brien boxer
- bouts
- 1
- won
- 1
- lost
- 0
- draw
- 0
- Status
- inactive
- Division
- middleweight
- Debut
- 1935-01-15
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1935-01-15 | Eddie Kinn | L | Forman's Arena, San Jose | WIN Technical knockout |