Billy O'Brien boxer
- bouts
- 7
- won
- 0
- lost
- 7
- draw
- 0
- Status
- inactive
- Division
- lightweight
- Debut
- 1922-03-24
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1930-06-11 | Battling Nelson | WLLDLD | Electric Park, Waterloo | LOST |
| 1929-06-20 | Cecil Payne | LWWLWW | McCabe Arena, Dayton | LOST KO |
| 1929-02-04 | King Levinsky | DLWWWD | White City Arena, Chicago | LOST Technical knockout |
| 1929-01-01 | Dick Gore | DLWLWW | Jacksonville | LOST Points |
| 1927-11-15 | Wildcat Jack Murphy | DLWW | Auditorium, Milwaukee | LOST Technical knockout |
| 1927-09-16 | Billy Light | WWDWWW | Mills Stadium, Chicago | LOST Technical knockout |
| 1927-03-07 | Earl Barnhardt | debut | Janesville | LOST |
| 1925-08-06 | Al Russell | WLWLLL | Madison | LOST |
| 1924-07-04 | Billy Petrolle | WLWWWD | Carrington | LOST KO |
| 1922-12-20 | Frankie Osner | DWWWLL | Big Chief A.C., Chicago | LOST |
| 1922-11-27 | Bud Taylor | LWWLWW | Peoria | LOST |
| 1922-03-24 | King Rollo | D | U.S.S. Commodore, Chicago | LOST Points |