# 1989 Guarujá Open – Singles

Luiz Mattar was the defending champion and won in the final 7–6, 6–4 against Jimmy Brown.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Luiz Mattar (champion)
* Lawson Duncan (first round)
* Jaime Yzaga (semifinals)
* Cássio Motta (quarterfinals)
* Javier Frana (first round)
* Eduardo Bengoechea (quarterfinals)
* Todd Witsken (quarterfinals)
* Danilo Marcelino (semifinals)

## 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
| 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 | Semifinals | Final | Final | Final | Final |
| 1 | L Mattar | 6 | 6 | | | | | | | | | | | | | | | | | | | |
| | C Kist | 2 | 2 | | 1 | L Mattar | 7 | 6 | | | | | | | | | | | | | | |
| LL | G Barbosa | 7 | 6 | | LL | G Barbosa | 6 | 1 | | | | | | | | | | | | | | |
| | J Daher | 6 | 4 | | | | | | 1 | L Mattar | 7 | 7 | | | | | | | | | | |
| | R Acioly | 6 | 0 | 3 | | | | | 7 | T Witsken | 5 | 5 | | | | | | | | | | |
| WC | R Jabali | 4 | 6 | 6 | WC | R Jabali | 2 | 2 | | | | | | | | | | | | | | |
| Q | N Aerts | 7 | 3 | 3 | 7 | T Witsken | 6 | 6 | | | | | | | | | | | | | | |
| 7 | T Witsken | 5 | 6 | 6 | | | | | | | | | | 1 | L Mattar | 6 | 6 | | | | | |
| 3 | J Yzaga | 7 | 6 | | | | | | | | | | | 3 | J Yzaga | 3 | 2 | | | | | |
| | R Argüello | 6 | 1 | | 3 | J Yzaga | 6 | 6 | | | | | | | | | | | | | | |
| WC | J Oncins | 2 | 3 | | | M Wostenholme | 3 | 2 | | | | | | | | | | | | | | |
| | M Wostenholme | 6 | 6 | | | | | | 3 | J Yzaga | 3 | 6 | 6 | | | | | | | | | |
| | M Menezes | 6 | 6 | | | | | | 6 | E Bengoechea | 6 | 2 | 4 | | | | | | | | | |
| | J Góes | 3 | 4 | | | M Menezes | 4 | 4 | | | | | | | | | | | | | | |
| | D Campos | 6 | 6 | | 6 | E Bengoechea | 6 | 6 | | | | | | | | | | | | | | |
| 6 | E Bengoechea | 7 | 7 | | | | | | | | | | | | | | | | 1 | Luiz Mattar | 7 | 6 |
| 5 | J Frana | 6 | 2 | 3 | | | | | | | | | | | | | | | | Jimmy Brown | 6 | 4 |
| | J Brown | 4 | 6 | 6 | | J Brown | 6 | 6 | | | | | | | | | | | | | | |
| Q | E Oliveira | 4 | 3 | | | M Hennemann | 0 | 0 | | | | | | | | | | | | | | |
| | M Hennemann | 6 | 6 | | | | | | | J Brown | 6 | 6 | 7 | | | | | | | | | |
| Q | R Camargo | 3 | 6 | 6 | | | | | 4 | C Motta | 4 | 7 | 5 | | | | | | | | | |
| | I Kley | 6 | 3 | 4 | Q | R Camargo | 1 | 1 | | | | | | | | | | | | | | |
| | F Roese | 3 | 2 | | 4 | C Motta | 6 | 6 | | | | | | | | | | | | | | |
| 4 | C Motta | 6 | 6 | | | | | | | | | | | | J Brown | 1 | 6 | 6 | | | | |
| 8 | D Marcelino | 6 | 7 | | | | | | | | | | | 8 | D Marcelino | 6 | 1 | 2 | | | | |
| | M Allen | 3 | 6 | | 8 | D Marcelino | 6 | 7 | | | | | | | | | | | | | | |
| | R Azar | 2 | 7 | 1 | WC | A Hocevar | 4 | 6 | | | | | | | | | | | | | | |
| WC | A Hocevar | 6 | 5 | 6 | | | | | 8 | D Marcelino | 6 | 6 | | | | | | | | | | |
| | P Ballauff | 6 | 4 | | | | | | | C Allgårdh | 3 | 2 | | | | | | | | | | |
| | R Viver | 7 | 6 | | | R Viver | 2 | 4 | | | | | | | | | | | | | | |
| | C Allgårdh | 7 | 6 | | | C Allgårdh | 6 | 6 | | | | | | | | | | | | | | |
| 2 | L Duncan | 5 | 0 | | | | | | | | | | | | | | | | | | | |