Jack O'Brien boxer
- bouts
- 2
- won
- 1
- lost
- 1
- draw
- 0
- Status
- inactive
- Division
- featherweight
- Debut
- 1897-01-14
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1897-05-15 | Danny McDonald | D | Polo A.C., New York | WIN Technical knockout |
| 1897-01-14 | Jack Ashton | LLWD | Tuxedo A.C., Philadelphia | LOST Points |