# 1988 Guarujá Open – Singles

Luiz Mattar successfully defended his title by defeating Eliot Teltscher 6–3, 6–3 in the final.

## Seeds

* Eliot Teltscher (final)
* Luiz Mattar (champion)
* Lawson Duncan (second round)
* Javier Frana (second round)
* Diego Pérez (quarterfinals)
* Marcelo Filippini (second round)
* Cássio Motta (quarterfinals)
* Pablo Arraya (quarterfinals)

## 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 | Final | Final | Final | Final |
| 1 | Eliot Teltscher | 6 | 6 | | | | |
| | Danilo Marcelino | 1 | 4 | | | | |
| | Danilo Marcelino | 1 | 4 | 1 | Eliot Teltscher | 3 | 3 |
| | | | | 2 | Luiz Mattar | 6 | 6 |
| | Martin Wostenholme | 3 | 3 | 2 | Luiz Mattar | 6 | 6 |
| 2 | Luiz Mattar | 6 | 6 | | | | |

### Top half

| First Round | First Round | First Round | First Round | First Round | Second Round | Second Round | Second Round | Second Round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | E Teltscher | 7 | 6 | | | | | | | | | | | | | | |
| | I Kley | 5 | 2 | | 1 | E Teltscher | 6 | 6 | | | | | | | | | |
| WC | D Campos | 5 | 4 | | | P Baur | 3 | 3 | | | | | | | | | |
| | P Baur | 7 | 6 | | | | | | 1 | E Teltscher | 6 | 7 | | | | | |
| | C Kist | 2 | 4 | | | | | | 8 | P Arraya | 1 | 5 | | | | | |
| | B Cox | 6 | 6 | | | B Cox | 3 | 3 | | | | | | | | | |
| | R Acuña | 4 | 4 | | 8 | P Arraya | 6 | 6 | | | | | | | | | |
| 8 | P Arraya | 6 | 6 | | | | | | | | | | | 1 | E Teltscher | 6 | 6 |
| 4 | J Frana | 7 | 7 | | | | | | | | | | | | D Marcelino | 1 | 4 |
| | J Daher | 6 | 6 | | 4 | J Frana | 5 | 2 | | | | | | | | | |
| | D Marcelino | 6 | 6 | | | D Marcelino | 7 | 6 | | | | | | | | | |
| | G Garetto | 4 | 3 | | | | | | | D Marcelino | 4 | 6 | 6 | | | | |
| | G Barbosa | 6 | 7 | | | | | | 5 | D Pérez | 6 | 3 | 4 | | | | |
| | R Saad | 4 | 5 | | | G Barbosa | 3 | 3 | | | | | | | | | |
| | J Góes | 6 | 0 | 3 | 5 | D Pérez | 6 | 6 | | | | | | | | | |
| 5 | D Pérez | 4 | 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 |
| 6 | M Filippini | 6 | 6 | | | | | | | | | | | | | | |
| WC | M Menezes | 0 | 4 | | 6 | M Filippini | 6 | 6 | 0$^r$ | | | | | | | | |
| Q | N Aerts | 4 | 1 | | | M Wostenholme | 2 | 7 | 0 | | | | | | | | |
| | M Wostenholme | 6 | 6 | | | | | | | | M Wostenholme | 6 | 7 | | | | |
| | R Argüello | 7 | 3 | 6 | | | | | | | R Argüello | 2 | 6 | | | | |
| | B Willenborg | 5 | 6 | 3 | | R Argüello | 6 | 6 | | | | | | | | | |
| WC | A Hocevar | 3 | 1 | | 3 | L Duncan | 2 | 4 | | | | | | | | | |
| 3 | L Duncan | 6 | 6 | | | | | | | | | | | | M Wostenholme | 3 | 3 |
| 7 | C Motta | 6 | 6 | | | | | | | | | | | 2 | L Mattar | 6 | 6 |
| | M Rackl | 1 | 2 | | 7 | C Motta | 6 | 7 | | | | | | | | | |
| | D Montes de Oca | 3 | 2 | | Q | R Acioly | 3 | 5 | | | | | | | | | |
| Q | R Acioly | 6 | 6 | | | | | | | 7 | C Motta | 0 | 2 | | | | |
| | R Båthman | 4 | 6 | 2 | | | | | | 2 | L Mattar | 6 | 6 | | | | |
| Q | O Della | 6 | 3 | 6 | Q | O Della | 3 | 2 | | | | | | | | | |
| Q | D Kass | 3 | 3 | | 2 | L Mattar | 6 | 6 | | | | | | | | | |
| 2 | L Mattar | 6 | 6 | | | | | | | | | | | | | | |