| 1994-02-04 | Davis Cup G2 QF: PAR vs VEN | Clay | RR | 537 |  Jimy Szymanski | 527 |  Ruben Alvarenga | 5-7 7-5 7-5 | H2H | 3 | - | - | - | - | - | - | - |
| 1994-02-04 | Davis Cup G2 QF: PAR vs VEN | Clay | RR | 144 | Nicolas Pereira | 527 | Ruben Alvarenga | 7-5 6-3 6-3 | H2H | 5 | - | - | - | - | - | - | - |
| 1993-03-26 | Davis Cup G2 SF: PER vs PAR | Clay | RR | 316 |  Alejandro Aramburu | 497 | Ruben Alvarenga | 6-3 6-4 7-6(2) | H2H | 5 | - | - | - | - | - | - | - |
| 1993-03-26 | Davis Cup G2 SF: PER vs PAR | Clay | RR | 63 | Jaime Yzaga | 497 | Ruben Alvarenga | 6-3 4-6 6-1 | H2H | 3 | - | - | - | - | - | - | - |
| 1993-02-05 | Davis Cup G2 QF: DOM vs PAR | Clay | RR | 483 | Ruben Alvarenga | - |  Rafael Moreno | 1-6 6-3 6-2 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 1993-02-05 | Davis Cup G2 QF: DOM vs PAR | Clay | RR | - | Genaro De Leon | 483 | Ruben Alvarenga | 6-3 6-3 7-5 | H2H | 5 | - | - | - | - | - | - | - |
| 1992-01-31 | Davis Cup G1 QF: PAR vs CUB | Clay | RR | 252 |  Mario Tabares | 437 | Ruben Alvarenga | 6-1 3-6 6-3 | H2H | 3 | - | - | - | - | - | - | - |
| 1992-01-31 | Davis Cup G1 QF: PAR vs CUB | Clay | RR | 518 | Juan Pino | 437 | Ruben Alvarenga | 1-6 7-5 6-4 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 1990-03-30 | Davis Cup G1 SF: PAR vs CAN | Clay | RR | 69 |  Andrew Sznajder | - | Ruben Alvarenga | 6-4 6-1 | H2H | 3 | - | - | - | - | - | - | - |
| 1989-07-21 | Davis Cup WG PO: SUI vs PAR | Clay | RR | 9 |  Jakob Hlasek | - | Ruben Alvarenga | 6-2 6-2 | H2H | 3 | - | - | - | - | - | - | - |
