1989 Guarujá Open – Singles
| Singles | |
|---|---|
| 1989 Guarujá Open | |
| 1988 Champion |
 Luiz Mattar
|
| Champion |
Luiz Mattar
|
| Runner-up |
 Jimmy Brown
|
| Final score | 7–6, 6–4 |
Luiz Mattar was the defending champion and won in the final 7–6, 6–4 against Jimmy Brown.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
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