Billy Duffy ((of Boston)) boxeador
- luta
- 9
- vitória
- 4
- derrota
- 5
- empate
- 0
- Estado
- inactive
- divisão
- featherweight
- Estreia
- 1903-04-17
- Altura
- -
- Alcance
- -
- Idade
- -
- Born
- -
- Death
- -
- Nascimento
- USA
| Data | Adversário | Últimos resultados dos adversários | Lugar | Resultado |
|---|---|---|---|---|
| 1905-09-23 | Boxer Kelly | LDWWDD | National A.C., Philadelphia | LOST Technical knockout |
| 1904-12-02 | Denny O'Connell | debut | Woodward's Pavilion, San Francisco | LOST Points |
| 1904-08-19 | Joe McDonald | debut | Woodward's Pavilion, San Francisco | WIN Points |
| 1904-05-05 | Roderick Earle | debut | Woodward's Pavilion, San Francisco | WIN Points |
| 1904-01-11 | Dick Cullen | WLWLWW | Mechanics' Pavilion Annex, San Francisco | LOST Points |
| 1903-11-13 | Dick Cullen | WWWLWL | Mechanic's Pavilion, San Francisco | LOST Points |
| 1903-08-21 | Pierpont Ordway | WLWWWL | Sixth Street Gym, San Francisco | WIN Points |
| 1903-04-17 | Billy 'Rough House' McDonald | LWLWLW | San Francisco A.C., San Francisco | LOST KO |