Juan Sierra boxer
- bouts
- 9
- won
- 3
- lost
- 6
- draw
- 0
- Status
- inactive
- Division
- bantamweight
- Debut
- 1976-10-19
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Dominican Republic
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1978-10-26 | Quiro Hernandez | WW | Santo Domingo | LOST Points |
| 1978-08-28 | Julio Guerrero | WWLWWW | Santo Domingo | LOST KO |
| 1978-07-05 | Julio Guerrero | WWLWW | Santo Domingo | LOST Points |
| 1978-03-28 | Elpidio de Paula | LWWWW | Santo Domingo | WIN Points |
| 1977-08-08 | Luis A Burgos | L | Palacio de Deportes, Santo Domingo | WIN KO |
| 1977-05-31 | Lazaro Fabiano | WWL | Santo Domingo | WIN Technical knockout |
| 1977-04-15 | Leopoldo Frias | W | Santo Domingo | LOST KO |
| 1977-01-02 | Enrique Sanchez | L | Santo Domingo | LOST KO |
| 1976-10-19 | Elpidio de Paula | L | Santo Domingo | LOST KO |