# 1990 Chevrolet Classic – Singles

Luiz Mattar was the defending champion, but lost in the final to Martín Jaite. The score was 3–6, 6–4, 6–3.

## Seeds

* Jay Berger (quarterfinals)
* Martín Jaite (champion)
* Jaime Yzaga (first round)
* Luiz Mattar (final)
* Diego Pérez (withdrew)
* Cássio Motta (quarterfinals)
* Eduardo Bengoechea (semifinals)
* Horacio de la Peña (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 7 | Eduardo Bengoechea | 4 | 2 | | | | | | |
| 4 | Luiz Mattar | 6 | 6 | | | | | | |
| 4 | Luiz Mattar | 6 | 6 | | 4 | Luiz Mattar | 6 | 4 | 3 |
| | | | | | 2 | Martín Jaite | 3 | 6 | 6 |
| WC | Alexandre Hocevar | 2 | 6 | 3 | 2 | Martín Jaite | 3 | 6 | 6 |
| 2 | Martín Jaite | 6 | 3 | 6 | | | | | |

### Top half

| First Round | First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | J Berger | 6 | 6 | | | | | | | | | | | | | | |
| Q | N Aerts | 4 | 1 | | 1 | J Berger | 6 | 6 | | | | | | | | | |
| | M Menezes | 7$^9$ | 1 | 5 | | G Markus | 3 | 0 | | | | | | | | | |
| | G Markus | 6$^7$ | 6 | 7 | | | | | | 1 | J Berger | 5 | 0 | | | | |
| | P Ballauff | 2 | 6 | 6 | | | | | | 7 | E Bengoechea | 7 | 6 | | | | |
| | F Yunis | 6 | 4 | 1 | | P Ballauff | 4 | 5 | | | | | | | | | |
| WC | J Oncins | 2 | 4 | | 7 | E Bengoechea | 6 | 7 | | | | | | | | | |
| 7 | E Bengoechea | 6 | 6 | | | | | | | | | | | 7 | E Bengoechea | 4 | 2 |
| 4 | L Mattar | 7 | 6 | | | | | | | | | | | 4 | L Mattar | 6 | 6 |
| | F Roese | 5 | 3 | | 4 | L Mattar | 4 | 7$^{11}$ | 6 | | | | | | | | |
| | P Rebolledo | 4 | 0 | | Q | H Rittersbacher | 6 | 6$^9$ | 4 | | | | | | | | |
| Q | H Rittersbacher | 6 | 6 | | | | | | | 4 | L Mattar | 6 | 6 | | | | |
| | A Aramburú | 2 | 6 | 6 | | | | | | LL | I Kley | 3 | 2 | | | | |
| | M Wostenholme | 6 | 4 | 4 | | A Aramburú | 3 | 4 | | | | | | | | | |
| WC | J Zwetsch | 6 | 4 | 4 | LL | I Kley | 6 | 6 | | | | | | | | | |
| LL | I Kley | 3 | 6 | 6 | | | | | | | | | | | | | |

### Bottom half

| First Round | First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | C Motta | 3 | 6 | 6 | | | | | | | | | | | | | | |
| | C Saceanu | 6 | 2 | 1 | 6 | C Motta | 6 | 6 | | | | | | | | | | |
| | D Marcelino | 4 | 0 | | | M Nido | 4 | 1 | | | | | | | | | | |
| | M Nido | 6 | 6 | | | | | | | 6 | C Motta | 4 | 1 | | | | | |
| WC | A Hocevar | 6 | 6 | | | | | | | WC | A Hocevar | 6 | 6 | | | | | |
| Q | O Della | 0 | 4 | | WC | A Hocevar | 5 | 6 | 6 | | | | | | | | | |
| | M Tabares | 7$^7$ | 7$^7$ | | | M Tabares | 7 | 0 | 4 | | | | | | | | | |
| 3 | J Yzaga | 6$^5$ | 6$^4$ | | | | | | | | | | | WC | A Hocevar | 2 | 6 | 3 |
| 8 | H de la Peña | 6 | 6 | | | | | | | | | | | 2 | M Jaite | 6 | 3 | 6 |
| | G Rivas | 2 | 3 | | 8 | H de la Peña | 6$^4$ | 1$^r$ | | | | | | | | | | |
| | P Vojtíšek | 6 | 6 | | | P Vojtíšek | 7$^7$ | 3 | | | | | | | | | | |
| | J Tarango | 4 | 3 | | | | | | | | P Vojtíšek | 5 | 2 | | | | | |
| Q | J Sobel | 5 | 6 | 6 | | | | | | 2 | M Jaite | 7 | 6 | | | | | |
| | R Argüello | 7 | 4 | 4 | Q | J Sobel | 1 | 2 | | | | | | | | | | |
| | J Frana | 6$^3$ | 3 | | 2 | M Jaite | 6 | 6 | | | | | | | | | | |
| 2 | M Jaite | 7$^7$ | 6 | | | | | | | | | | | | | | | |