John O'Brien boxer
- bouts
- 6
- won
- 4
- lost
- 2
- draw
- 0
- Status
- inactive
- Division
- featherweight
- Debut
- 1888-03-19
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1897-04-17 | Arthur Jones | WW | Polo A.C., New York | WIN KO |
| 1897-03-27 | Mike Lyons | L | Polo A.C., New York | WIN Points |
| 1893-04-13 | Jack Grace | WLLLL | New Utrecht A.C., Brooklyn | LOST Points |
| 1892-12-01 | Mike Brennan | L | Coney Island | WIN KO |
| 1889-12-03 | Mike Brennan | debut | Newtown | WIN KO |
| 1889-04-29 | Johnny Van Heest | DWWWWW | Alcazar Theater, Hurley | LOST KO |
| 1888-03-19 | Jack Dougherty | debut | Corona | LOST |