Jack O'Brien boxer
- bouts
- 2
- won
- 1
- lost
- 1
- draw
- 0
- Status
- inactive
- Division
- lightweight
- Debut
- 1900-04-24
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1900-11-07 | Jimmy Reeder | WWDWLL | Barnesboro | LOST KO |
| 1900-04-24 | Billy Moore | LWLLLL | Manhattan A.C., Troy | WIN KO |