Jack O'Brien boxer
- bouts
- 3
- won
- 2
- lost
- 1
- draw
- 0
- Status
- inactive
- Division
- -
- Debut
- 1922-03-15
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1927-02-28 | Dick Evans | WLWWL | Youngstown | LOST KO |
| 1922-03-22 | Tommy Blake | debut | Association Club, San Francisco | WIN KO |
| 1922-03-15 | Henry Miller | debut | Association Club, San Francisco | WIN KO |