# 1989 Banespa Open – Singles

Luiz Mattar won in the final 6–4, 5–7, 6–4 against Martín Jaite.

## 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)
* Horacio de la Peña (quarterfinals)
* Martín Jaite (final)
* Eduardo Bengoechea (quarterfinals)
* Cássio Motta (semifinals)
* Javier Frana (first round)
* Todd Witsken (semifinals)
* Tim Wilkison (first 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
| 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 | Final |
| 1 | L Mattar | 6 | 3 | 3 | | | | | | | | | | | | | | | | | | | |
| WC | J Oncins | 1 | 6 | 0/r | 1 | L Mattar | 6 | 6 | | | | | | | | | | | | | | | |
| | P Doohan | 6 | 4 | 6 | | P Doohan | 3 | 1 | | | | | | | | | | | | | | | |
| Q | J Sobel | 1 | 6 | 4 | | | | | 1 | L Mattar | 6 | 6 | | | | | | | | | | | |
| | F Yunis | 4 | 5 | | | | | | | T Högstedt | 4 | 4 | | | | | | | | | | | |
| | T Högstedt | 6 | 7 | | | T Högstedt | 7 | 6 | | | | | | | | | | | | | | | |
| Q | R Jabali | 6 | 1 | 7 | Q | R Jabali | 5 | 3 | | | | | | | | | | | | | | | |
| 8 | T Wilkison | 3 | 6 | 6 | | | | | | | | | | 1 | L Mattar | 6 | 6 | | | | | | |
| 4 | E Bengoechea | 6 | 6 | | | | | | | | | | | 5 | C Motta | 4 | 3 | | | | | | |
| | M Menezes | 2 | 2 | | 4 | E Bengoechea | 6 | 6 | | | | | | | | | | | | | | | |
| | P Rebolledo | 6 | 6 | | | P Rebolledo | 2 | 2 | | | | | | | | | | | | | | | |
| | R Acuña | 2 | 3 | | | | | | 4 | E Bengoechea | 7 | 4 | 4 | | | | | | | | | | |
| | M Ingaramo | 6 | 1 | | | | | | 5 | C Motta | 5 | 6 | 6 | | | | | | | | | | |
| | I Kley | 7 | 6 | | | I Kley | 2 | 4 | | | | | | | | | | | | | | | |
| WC | A Hocevar | 2 | 7 | 2 | 5 | C Motta | 6 | 6 | | | | | | | | | | | | | | | |
| 5 | C Motta | 6 | 5 | 6 | | | | | | | | | | | | | | | 1 | Luiz Mattar | 6 | 5 | 6 |
| 6 | J Frana | 5 | 5 | | | | | | | | | | | | | | | | 3 | Martín Jaite | 4 | 7 | 4 |
| WC | M Hennemann | 7 | 7 | | WC | M Hennemann | 3 | 4 | | | | | | | | | | | | | | | |
| | D Marcelino | 6 | 6 | 4 | | G Rivas | 6 | 6 | | | | | | | | | | | | | | | |
| | G Rivas | 3 | 7 | 6 | | | | | | G Rivas | 1 | 3 | | | | | | | | | | | |
| | R Argüello | 6 | 6 | 3 | | | | | 3 | M Jaite | 6 | 6 | | | | | | | | | | | |
| | F Roese | 1 | 7 | 6 | | F Roese | 4 | 4 | | | | | | | | | | | | | | | |
| | K Kinnear | 7 | 5 | 5 | 3 | M Jaite | 6 | 6 | | | | | | | | | | | | | | | |
| 3 | M Jaite | 6 | 7 | 7 | | | | | | | | | | 3 | M Jaite | 4 | 6 | 6 | | | | | |
| 7 | T Witsken | 7 | 4 | 7 | | | | | | | | | | 7 | T Witsken | 6 | 4 | 4 | | | | | |
| | D Cassidy | 5 | 6 | 5 | 7 | T Witsken | 6 | 6 | | | | | | | | | | | | | | | |
| Q | C Kist | 3 | 4 | | | C Mezzadri | 4 | 3 | | | | | | | | | | | | | | | |
| | C Mezzadri | 6 | 6 | | | | | | 7 | T Witsken | 7 | 6 | | | | | | | | | | | |
| | P Baur | 6 | 6 | | | | | | 2 | H de la Peña | 6 | 1 | | | | | | | | | | | |
| | J Lozano | 3 | 4 | | | P Baur | 2 | 6 | | | | | | | | | | | | | | | |
| Q | F Pinto | 4 | 0 | | 2 | H de la Peña | 6 | 7 | | | | | | | | | | | | | | | |
| 2 | H de la Peña | 6 | 6 | | | | | | | | | | | | | | | | | | | | |