# 1990 Dutch Open – Singles

Karel Nováček was the defending champion, but lost in the first round this year.
Francisco Clavet won the tournament, beating Eduardo Masso in the final, 3–6, 6–4, 6–2, 6–0.

## Seeds

* Emilio Sánchez (semifinals)
* Martín Jaite (quarterfinals)
* Juan Aguilera (second round)
* Guillermo Pérez Roldán (first round)
* Marc Rosset (first round, retired)
* Carl-Uwe Steeb (first round)
* Horst Skoff (first round)
* Karel Nováček (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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final | Final |
| 1 | Emilio Sánchez | 4 | 5 | | | | | | | |
| Q | Eduardo Masso | 6 | 7 | | | | | | | |
| Q | Eduardo Masso | 6 | 7 | | Q | Eduardo Masso | 6 | 4 | 2 | 0 |
| | | | | | LL | Francisco Clavet | 3 | 6 | 6 | 6 |
| | Omar Camporese | 6 | 6$^3$ | 6$^3$ | LL | Francisco Clavet | 3 | 6 | 6 | 6 |
| LL | Francisco Clavet | 4 | 7$^7$ | 7$^7$ | | | | | | |

### 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 | E Sánchez | 6 | 5 | 6 | | | | | | | | | | | | | | |
| WC | T Nijssen | 3 | 7 | 4 | 1 | E Sánchez | 4 | 7 | 6 | | | | | | | | | |
| WC | J Yzaga | 6 | 6 | 2 | | W Masur | 6 | 6 | 4 | | | | | | | | | |
| | W Masur | 7 | 4 | 6 | | | | | | 1 | E Sánchez | 6 | 7$^7$ | | | | | |
| Q | O Delaître | 6 | 6 | | | | | | | Q | O Delaître | 2 | 6$^1$ | | | | | |
| | J Arrese | 1 | 0 | | Q | O Delaître | 3 | 6 | 6 | | | | | | | | | |
| | J Sánchez | 7 | 4 | 7 | | J Sánchez | 6 | 4 | 4 | | | | | | | | | |
| 7 | H Skoff | 6 | 6 | 6 | | | | | | | | | | | 1 | E Sánchez | 4 | 5 |
| 3 | J Aguilera | 6 | 7 | | | | | | | | | | | | Q | E Masso | 6 | 7 |
| | M Vajda | 4 | 5 | | 3 | J Aguilera | 3 | 6 | 2 | | | | | | | | | |
| | G Prpić | 5 | 3 | | Q | E Masso | 6 | 3 | 6 | | | | | | | | | |
| Q | E Masso | 7 | 6 | | | | | | | Q | E Masso | 4 | 7 | 6 | | | | |
| Q | S Casal | 6 | 5 | 6 | | | | | | | S Bruguera | 6 | 5 | 0 | | | | |
| | D Pérez | 1 | 7 | 2 | Q | S Casal | 1 | 3 | | | | | | | | | | |
| | S Bruguera | 6 | 6 | | | S Bruguera | 6 | 6 | | | | | | | | | | |
| 6 | C-U Steeb | 3 | 1 | | | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | M Rosset | 2 | 1$^r$ | | | | | | | | | | | | | | | | |
| Q | C Costa | 6 | 3 | | Q | C Costa | 6 | 6 | 1 | | | | | | | | | | |
| | F Davín | 3 | 1 | | | R Agénor | 7 | 3 | 6 | | | | | | | | | | |
| | R Agénor | 6 | 6 | | | | | | | | R Agénor | 5 | 6$^2$ | | | | | | |
| | F Santoro | 3 | 5 | | | | | | | | O Camporese | 7 | 7$^7$ | | | | | | |
| | O Camporese | 6 | 7 | | | O Camporese | 6 | 6 | 7 | | | | | | | | | | |
| | M Filippini | 6 | 6 | | | M Filippini | 7 | 1 | 6 | | | | | | | | | | |
| 4 | G Pérez Roldán | 3 | 4 | | | | | | | | | | | | | O Camporese | 6 | 6$^3$ | 6$^3$ |
| 8 | K Nováček | 6 | 6 | | | | | | | | | | | | LL | F Clavet | 4 | 7$^7$ | 7$^7$ |
| LL | F Clavet | 7 | 7 | | LL | F Clavet | 7 | 6 | | | | | | | | | | | |
| | P Haarhuis | 6 | 6 | | | P Haarhuis | 5 | 2 | | | | | | | | | | | |
| | A Mancini | 2 | 2 | | | | | | | LL | F Clavet | 5 | 6 | 6 | | | | | |
| | T Carbonell | 7 | 3 | 6 | | | | | | 2 | M Jaite | 7 | 1 | 2 | | | | | |
| | R Azar | 6 | 6 | 3 | | T Carbonell | 6 | 5 | 4 | | | | | | | | | | |
| | M Koevermans | 6 | 1 | 3 | 2 | M Jaite | 4 | 7 | 6 | | | | | | | | | | |
| 2 | M Jaite | 1 | 6 | 6 | | | | | | | | | | | | | | | |