Billy O'Brien (Willie) boxeador
- luta
- 5
- vitória
- 0
- derrota
- 4
- empate
- 1
- Estado
- inactive
- divisão
- -
- Estreia
- 1900-10-04
- Altura
- -
- Alcance
- -
- Idade
- -
- Born
- -
- Death
- -
- Nascimento
- USA
| Data | Adversário | Últimos resultados dos adversários | Lugar | Resultado |
|---|---|---|---|---|
| 1902-07-30 | George Ellis | LL | Mechanics' Pavilion Annex, San Francisco | LOST KO |
| 1902-05-07 | Johnny Crowe | LDWW | Mechanics' Pavilion Annex, San Francisco | LOST Points |
| 1902-02-25 | Willie Sweetman | debut | Mechanics' Pavilion Annex, San Francisco | LOST KO |
| 1900-11-19 | W Foster | debut | Bay City A.C., San Francisco | LOST Technical knockout |
| 1900-10-04 | Charles Anderson | debut | San Francisco A.C., San Francisco | DRAW Points |
