Billy O'Brien boxer
- bouts
- 4
- won
- 1
- lost
- 3
- draw
- 0
- Status
- inactive
- Division
- featherweight
- Debut
- 1889-07-12
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1893-01-03 | Joe Flaherty | LLDLWL | Highland Park | LOST KO |
| 1892-11-24 | Joe Flaherty | LLLDLW | Quincy | WIN |
| 1889-08-02 | Johnny Van Heest | WWWWWW | Ashland | LOST KO |
| 1889-07-12 | Johnny Van Heest | WWWWWW | Ashland | LOST Points |
