The San Juan Open is a defunct Grand Prix affiliated men's tennis tournament played from 1980 to 1981. It was held in San Juan, Puerto Rico and played on outdoor hard courts. It was the successor tournament to the WCT Puerto Rico mens event staged once in 1975.
Finals
Singles
| Year | Champions | Runners-up | Score |
|---|---|---|---|
| 1980 |  Raúl Ramírez |
 Phil Dent |
6–3, 6–2 |
| 1981 |  Eliot Teltscher |
Tim Gullikson |
6–4, 6–2 |
Doubles
| Year | Champions | Runners-up | Score |
|---|---|---|---|
| 1980 | Paul Kronk Paul McNamee |
 Robert Trogolo Mark Turpin |
7–6, 6–3 |
| 1981 | Tim Mayotte Chris Mayotte |
Tim Gullikson Eliot Teltscher |
6–4, 7–6 |