# 1990 Estoril Open – Men's singles

This was the first edition of the event.
Emilio Sánchez won in the final 6–3, 6–1, defeating Franco Davín.

## Seeds

* Jay Berger (Quarterfinals)
* Martín Jaite (first round)
* Emilio Sánchez (champion)
* Andrés Gómez (first round)
* Thomas Muster (quarterfinals)
* Jaime Yzaga (first round)
* Guillermo Pérez Roldán (first round)
* Sergi Bruguera (second 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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Jordi Arrese | 2 | 1 | | | | |
| 3 | Emilio Sánchez | 6 | 6 | | | | |
| 3 | Emilio Sánchez | 6 | 6 | 3 | Emilio Sánchez | 6 | 6 |
| | | | | | Franco Davín | 3 | 1 |
| | Juan Aguilera | 4 | 3 | | Franco Davín | 3 | 1 |
| | Franco Davín | 6 | 6 | | | | |

### Top half

| 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 |
| 1 WC | J Berger | 6 | 6 | | | | | | | | | | | | | | | |
| WC | J Cunha Silva | 1 | 3 | | 1 WC | J Berger | 7 | 7$^7$ | | | | | | | | | | |
| | R Agénor | 7$^7$ | 7$^7$ | | | R Agénor | 5 | 6$^5$ | | | | | | | | | | |
| | J Sánchez | 6$^3$ | 6$^2$ | | | | | | | 1 WC | J Berger | 6 | 3 | 5 | | | | |
| Q | F Clavet | 1 | 3 | | | | | | | | J Arrese | 4 | 6 | 7 | | | | |
| | J Arrese | 6 | 6 | | | J Arrese | 6 | 6 | | | | | | | | | | |
| | A Cherkasov | 7 | 6 | | | A Cherkasov | 2 | 2 | | | | | | | | | | |
| 7 | G Pérez Roldán | 5 | 3 | | | | | | | | | | | | | J Arrese | 2 | 1 |
| 3 | E Sánchez | 6 | 7 | | | | | | | | | | | | 3 | E Sánchez | 6 | 6 |
| | R Fromberg | 4 | 5 | | 3 | E Sánchez | 6 | 6 | | | | | | | | | | |
| | T Carbonell | 6 | 7$^7$ | | | T Carbonell | 4 | 3 | | | | | | | | | | |
| | J Fleurian | 2 | 6$^4$ | | | | | | | 3 | E Sánchez | 6 | 6 | | | | | |
| | O Camporese | 6 | 6 | | | | | | | | O Camporese | 2 | 1 | | | | | |
| | U Riglewski | 4 | 3 | | | O Camporese | 7$^{10}$ | 4 | 6 | | | | | | | | | |
| | K Nováček | 6 | 3 | 6 | | K Nováček | 6$^8$ | 6 | 1 | | | | | | | | | |
| 6 | J Yzaga | 3 | 6 | 2 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 5 | T Muster | 4 | 6 | 7 | | | | | | | | | | | | |
| | M Koevermans | 6 | 3 | 5 | 5 | T Muster | 7$^7$ | 6 | | | | | | | | |
| Q | F Santoro | 7 | 6 | | Q | F Santoro | 6$^3$ | 2 | | | | | | | | |
| Q | M Vajda | 5 | 4 | | | | | | | 5 | T Muster | 3 | 0 | | | |
| WC | N Marques | 4 | 3 | | | | | | | | J Aguilera | 6 | 6 | | | |
| | P Canè | 6 | 6 | | | P Canè | 2 | 7$^7$ | 4 | | | | | | | |
| | J Aguilera | 4 | 7$^7$ | 6 | | J Aguilera | 6 | 6$^5$ | 6 | | | | | | | |
| 4 | A Gómez | 6 | 6$^2$ | 1 | | | | | | | | | | J Aguilera | 4 | 3 |
| 8 | S Bruguera | 6 | 6 | | | | | | | | | | | F Davín | 6 | 6 |
| | M Střelba | 3 | 3 | | 8 | S Bruguera | 5 | 4 | | | | | | | | |
| Q | M Ozer | 1 | 4 | | | F Davín | 7 | 6 | | | | | | | | |
| Q | F Davín | 6 | 6 | | | | | | | | F Davín | 6 | 7 | | | |
| | J Potier | 1 | 6 | 6$^4$ | | | | | | | P Haarhuis | 4 | 5 | | | |
| | G Prpić | 6 | 1 | 7$^7$ | | G Prpić | 1 | 2 | | | | | | | | |
| | P Haarhuis | 6 | 6 | | | P Haarhuis | 6 | 6 | | | | | | | | |
| 2 | M Jaite | 0 | 3 | | | | | | | | | | | | | |