# 1989 Estoril Open – Singles

Isabel Cueto won in the final 7–6, 6–2 against Sandra Cecchini.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* n/a
* Barbara Paulus (quarterfinals)
* Isabel Cueto (champion)
* Sandra Cecchini (final)
* Judith Wiesner (second round)
* Regina Rajchrtová (quarterfinals)
* Patricia Tarabini (semifinals)
* Laura Garrone (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
| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| LL | C Singer | 3 | 1 | | | | | | | | | | | | | | | | | | | | |
| Q | K Piccolini | 6 | 6 | | Q | K Piccolini | 6 | 6 | | | | | | | | | | | | | | | |
| | S Hack | 6 | 6 | | | S Hack | 4 | 1 | | | | | | | | | | | | | | | |
| | A Hobbs | 0 | 2 | | | | | | | Q | K Piccolini | 7 | 6 | | | | | | | | | | |
| | A Dechaume | 5 | 5 | | | | | | | 8 | L Garrone | 5 | 3 | | | | | | | | | | |
| Q | F Bonsignori | 7 | 7 | | Q | F Bonsignori | 4 | 1 | | | | | | | | | | | | | | | |
| | A Villagrán | 0 | 0 | | 8 | L Garrone | 6 | 6 | | | | | | | | | | | | | | | |
| 8 | L Garrone | 6 | 6 | | | | | | | | | | | | Q | K Piccolini | 0 | 2 | | | | | |
| 3 | I Cueto | 7 | 7 | | | | | | | | | | | | 3 | I Cueto | 6 | 6 | | | | | |
| | L Golarsa | 6 | 5 | | 3 | I Cueto | 6 | 6 | | | | | | | | | | | | | | | |
| | S Goleš | 4 | 2 | | Q | S Dopfer | 2 | 2 | | | | | | | | | | | | | | | |
| Q | S Dopfer | 6 | 6 | | | | | | | 3 | I Cueto | 6 | 6 | | | | | | | | | | |
| | P Etchemendy | 1 | 6 | 6 | | | | | | 6 | R Rajchrtová | 2 | 2 | | | | | | | | | | |
| Q | R Bielsa | 6 | 2 | 4 | | P Etchemendy | 1 | 2 | | | | | | | | | | | | | | | |
| | C Dahlman | 2 | 6 | | 6 | R Rajchrtová | 6 | 6 | | | | | | | | | | | | | | | |
| 6 | R Rajchrtová | 6 | 7 | | | | | | | | | | | | | | | | | 3 | Isabel Cueto | 7 | 6 |
| 5 | J Wiesner | 6 | 6 | | | | | | | | | | | | | | | | | 4 | Sandra Cecchini | 6 | 2 |
| | L Corsato-Owsianka | 3 | 1 | | 5 | J Wiesner | 4 | 2 | | | | | | | | | | | | | | | |
| | A Vieira | 1 | 6 | 6 | | A Vieira | 6 | 6 | | | | | | | | | | | | | | | |
| | T Scheuer-Larsen | 6 | 4 | 1 | | | | | | | A Vieira | 3 | 2 | | | | | | | | | | |
| | P Ritter | 7 | 6 | | | | | | | 4 | S Cecchini | 6 | 6 | | | | | | | | | | |
| | P Miller | 5 | 1 | | | P Ritter | 6 | 6 | 2 | | | | | | | | | | | | | | |
| | O Tsarbopoulou | 4 | 4 | | 4 | S Cecchini | 7 | 2 | 6 | | | | | | | | | | | | | | |
| 4 | S Cecchini | 6 | 6 | | | | | | | | | | | | 4 | S Cecchini | 2 | 6 | 6 | | | | |
| 7 | P Tarabini | 6 | 6 | | | | | | | | | | | | 7 | P Tarabini | 6 | 4 | 4 | | | | |
| | E Crous | 0 | 1 | | 7 | P Tarabini | 6 | 6 | | | | | | | | | | | | | | | |
| | C Cohen | 2 | 2 | | | R Maršíková | 0 | 4 | | | | | | | | | | | | | | | |
| | R Maršíková | 6 | 6 | | | | | | | 7 | P Tarabini | 6 | 5 | 7 | | | | | | | | | |
| | F Labat | 4 | 4 | | | | | | | 2 | B Paulus | 4 | 7 | 5 | | | | | | | | | |
| | K Kschwendt | 6 | 6 | | | K Kschwendt | 0 | 6 | 3 | | | | | | | | | | | | | | |
| | I Budařová | 2 | 0 | | 2 | B Paulus | 6 | 1 | 6 | | | | | | | | | | | | | | |
| 2 | B Paulus | 6 | 6 | | | | | | | | | | | | | | | | | | | | |