The 1989 Guarujá Open was a men's tennis tournament held in Guarujá in Brazil and played on outdoor clay courts.

It was part of the 1989 Nabisco Grand Prix.

The tournament took place from 6 February through 13 February 1989.

First-seeded Luiz Mattar won his second consecutive singles title at the event.

[3] Luiz Mattar defeated Jimmy Brown 7–6, 6–4 Ricardo Acioly / Dacio Campos defeated César Kist / Mauro Menezes 7–6, 7–6