Jay O'Brien boxer
- bouts
- 4
- won
- 2
- lost
- 1
- draw
- 1
- Status
- inactive
- Division
- heavyweight
- Debut
- 1946-01-18
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1946-02-20 | Eddie Keller | LWLLLL | Auditorium, Oakland | DRAW Points |
| 1946-02-13 | Marvin Baker | DWLLWW | Auditorium, Oakland | WIN KO |
| 1946-01-25 | Marvin Baker | DWDWLL | National Hall, San Francisco | LOST Points |
| 1946-01-18 | George Kennedy | debut | National Hall, San Francisco | WIN KO |