Guillermo Nelson (Billy Nelson) boxer
- bouts
- 20
- won
- 11
- lost
- 6
- draw
- 2
- Status
- inactive
- Division
- featherweight
- Debut
- 1930-02-07
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Puerto Rico
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1936-10-29 | Jimmy Murray | LWLWDL | Mecca Sports Arena, New York | WIN Technical knockout |
| 1933-12-01 | Emilio Morris | WWWLWW | Victory Garden Stadium, San Juan | LOST KO |
| 1933-09-01 | Felix Garcia | WDWLWW | Victory Garden Stadium, San Juan | WIN Points |
| 1931-12-04 | Sindulfo Diaz | DDLLDW | San Juan Stadium, San Juan | WIN Points |
| 1931-11-26 | Vicente Abadia | LLWDLW | San Juan Stadium, San Juan | NC No Contest |
| 1931-09-06 | Sindulfo Diaz | WWDDLL | San Juan Stadium, San Juan | DRAW Points |
| 1931-06-28 | Pedro Montanez | WWWW | San Juan Stadium, San Juan | LOST Points |
| 1931-06-21 | Vicente Abadia | WWLWWL | San Juan Stadium, San Juan | WIN Points |
| 1931-05-10 | Felipe Andrade | WWWWL | San Juan Stadium, San Juan | LOST Points |
| 1931-02-01 | Pedro Rodriguez Nieves | WWLWWW | Victory Garden Stadium, San Juan | WIN Points |
| 1931-01-16 | Sindulfo Diaz | DWWWWD | Victory Garden Stadium, San Juan | DRAW Points |
| 1930-12-25 | Vicente Abadia | LWWWWW | Victory Garden Stadium, San Juan | WIN Points |
| 1930-11-09 | Julio Matias | WWL | Victory Garden Stadium, San Juan | LOST Points |
| 1930-09-21 | Pedro Rodriguez Nieves | WLWWW | Victory Garden Stadium, San Juan | WIN Points |
| 1930-09-12 | Vicente Abadia | WWWLWW | Victory Garden Stadium, San Juan | LOST Points |
| 1930-06-01 | Gus De Sagon | WLWDWW | Victory Garden Stadium, San Juan | LOST Points |
| 1930-05-04 | Herminio Villafane | WWW | Victory Garden Stadium, San Juan | WIN Points |
| 1930-04-06 | Rafael Morales | WWLDWW | Victory Garden Stadium, San Juan | WIN Points |
| 1930-03-09 | Ramon Rodriguez | LWWWLW | Victory Garden Stadium, San Juan | WIN Points |
| 1930-02-07 | Enrique Ruiz | debut | Victory Garden Stadium, San Juan | WIN Technical knockout |