Guillermo Rosario (Man-eater Rosario) boxer
- bouts
- 13
- won
- 6
- lost
- 4
- draw
- 2
- Status
- inactive
- Division
- welterweight
- Debut
- 1927-12-04
- Height
- -
- Reach
- -
- Age
- -
- Born
- 1908-02-11
- Death
- -
- Nationality
- Puerto Rico
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1935-08-18 | Milton Cofresi | debut | Victory Garden Stadium, San Juan | WIN Points |
| 1931-03-15 | Meliton Calderon | WWLWLL | Victory Garden Stadium, San Juan | WIN Points |
| 1931-02-01 | Lao Roman Torres | LLLLDL | Victory Garden Stadium, San Juan | DRAW Points |
| 1931-01-16 | Ramon Verdejo | LLLLLW | Victory Garden Stadium, San Juan | LOST KO |
| 1930-11-30 | Herminio Moreno | WWLLLW | Victory Garden Stadium, San Juan | LOST Points |
| 1930-11-23 | Gustavo Diaz | debut | Victory Garden Stadium, San Juan | WIN KO |
| 1929-02-22 | Candelario Martinez | LLLWW | Victory Garden Stadium, San Juan | NC No Contest |
| 1928-08-11 | Juan Alejandro | LLL | Victory Garden Stadium, San Juan | LOST Points |
| 1928-04-29 | Meliton Calderon | WWWW | Victory Garden Stadium, San Juan | LOST Points |
| 1928-02-10 | Charley Stapleton | L | Victory Garden Stadium, San Juan | DRAW Points |
| 1928-01-03 | Pio Cesareo | LLD | Victory Garden Stadium, San Juan | WIN Technical knockout |
| 1927-12-30 | William Marti | L | Victory Garden Stadium, San Juan | WIN Technical knockout |
| 1927-12-04 | Concepcion Andrade | W | Rio Piedras | WIN Points |