| Women's singles | |
|---|---|
| 1990 Estoril Open | |
| Champion |  Federica Bonsignori |
| Runner-up | Laura Garrone |
| Final score | 2–6, 6–3, 6–3 |
| Draw | 32 (2WC/4Q/1LL) |
| Seeds | 8 |
Isabel Cueto was the defending champion, but lost in the quarterfinals to Federica Bonsignori.
Bonsignori won the title by defeating Laura Garrone 2–6, 6–3, 6–3 in the final. [1] [2]
Isabel Cueto (Quarterfinals) Sandra Cecchini (Second round) Sabine Hack (Semifinals)
Nicole Jagerman (Second round)
Angeliki Kanellopoulou (Second round)
Patricia Tarabini (Semifinals)
Petra Langrová (First round) Florencia Labat (Second round)| Semifinals | Final | ||||||||||||
| Federica Bonsignori | 2 | 77 | 6 | ||||||||||
| 3 | Sabine Hack | 6 | 64 | 4 | |||||||||
| Federica Bonsignori | 2 | 6 | 6 | ||||||||||
| Laura Garrone | 6 | 3 | 3 | ||||||||||
| Laura Garrone | 6 | 6 | |||||||||||
| 6 | Patricia Tarabini | 2 | 2 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | I Cueto | 6 | 77 | ||||||||||||||||||||||||
| Q | A Kerek | 4 | 63 | 1 | I Cueto | 6 | 6 | ||||||||||||||||||||
| E Švíglerová | 6 | 6 | E Švíglerová | 4 | 1 | ||||||||||||||||||||||
| I Budařová | 2 | 1 | 1 | I Cueto | 2 | 6 | 4 | ||||||||||||||||||||
| LL |  V Ruano Pascual | 2 | 77 | 0 | F Bonsignori | 6 | 4 | 6 | |||||||||||||||||||
| F Bonsignori | 6 | 65 | 6 | F Bonsignori | 6 | 6 | |||||||||||||||||||||
| WC |  S Prazeres | 2 | 63 | 5 | A Kanellopoulou | 3 | 1 | ||||||||||||||||||||
| 5 | A Kanellopoulou | 6 | 77 | F Bonsignori | 2 | 77 | 6 | ||||||||||||||||||||
| 3 | S Hack | 6 | 6 | 3 | S Hack | 6 | 64 | 4 | |||||||||||||||||||
| V Martinek | 2 | 1 | 3 | S Hack | 6 | 6 | |||||||||||||||||||||
 S Dopfer | 2 | 1 | P Ritter | 2 | 2 | ||||||||||||||||||||||
| P Ritter | 6 | 6 | 3 | S Hack | 6 | 6 | |||||||||||||||||||||
 C Mothes | 6 | 6 | C Mothes | 3 | 3 | ||||||||||||||||||||||
| B Romanò | 0 | 1 | C Mothes | 6 | 6 | ||||||||||||||||||||||
| Q | S Farina | 3 | 1 | 8 | F Labat | 4 | 4 | ||||||||||||||||||||
| 8 | F Labat | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | P Langrová | 4 | 0 | ||||||||||||||||||||||||
| Q | N Guerrée | 6 | 6 | Q | N Guerrée | 3 | 4 | ||||||||||||||||||||
| L Garrone | 6 | 6 | L Garrone | 6 | 6 | ||||||||||||||||||||||
| WC | T Couto | 2 | 3 | L Garrone | 3 | 6 | 6 | ||||||||||||||||||||
| C Tanvier | 3 | 3 |  E Zardo | 6 | 2 | 1 | |||||||||||||||||||||
| E Zardo | 6 | 6 | E Zardo | 6 | 6 | ||||||||||||||||||||||
| P Etchemendy | 2 | 3 | 4 | N Jagerman | 1 | 1 | |||||||||||||||||||||
| 4 | N Jagerman | 6 | 6 | L Garrone | 6 | 6 | |||||||||||||||||||||
| 6 | P Tarabini | 77 | 6 | 6 | P Tarabini | 2 | 2 | ||||||||||||||||||||
 K Kschwendt | 61 | 2 | 6 | P Tarabini | 6 | 6 | |||||||||||||||||||||
 A Vieira | 7 | 6 | A Vieira | 4 | 2 | ||||||||||||||||||||||
| S Meier | 5 | 1 | 6 | P Tarabini | 6 | 4 | 6 | ||||||||||||||||||||
| K Piccolini | 6 | 6 | K Piccolini | 2 | 6 | 2 | |||||||||||||||||||||
| Q | R Bielsa | 1 | 4 | K Piccolini | 6 | 6 | |||||||||||||||||||||
| L Lásková | 0 | 0 | 2 | S Cecchini | 4 | 1 | |||||||||||||||||||||
| 2 | S Cecchini | 6 | 6 | ||||||||||||||||||||||||
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