# 1990 Casablanca Open – Singles

Tarik Benhabiles was the defending champion but lost in the second round to Thomas Muster.
Muster won in the final, 6–1, 6–7$^{(3–7)}$, 6–2, against Guillermo Pérez Roldán.

## Seeds

* Guillermo Pérez Roldán (final)
* Thomas Muster (champion)
* Goran Prpić (semifinals)
* Martin Střelba (first round)
* Paul Haarhuis (first round)
* Tomás Carbonell (semifinals)
* Mark Koevermans (quarterfinals)
* Franco Davín (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 | Final |
| 1 | Guillermo Pérez Roldán | 6 | 6 | | | | | |
| 6 | Tomás Carbonell | 1 | 1 | | | | | |
| 6 | Tomás Carbonell | 1 | 1 | 1 | Guillermo Pérez Roldán | 1 | 7$^7$ | 2 |
| | | | | 2 | Thomas Muster | 6 | 6$^3$ | 6 |
| 3 | Goran Prpić | 1 | 3 | 2 | Thomas Muster | 6 | 6$^3$ | 6 |
| 2 | Thomas Muster | 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 | G Pérez Roldán | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| Q | T Woodbridge | 6$^3$ | 1 | | 1 | G Pérez Roldán | 3 | 6 | 6 | | | | | | | | | |
| | R Fromberg | 6 | 4 | 6 | | R Fromberg | 6 | 3 | 3 | | | | | | | | | |
| Q | M Larsson | 2 | 6 | 2 | | | | | | 1 | G Pérez Roldán | 6 | 7 | | | | | |
| | N Kulti | 5 | 0 | | | | | | | | T Tulasne | 2 | 5 | | | | | |
| | T Tulasne | 7 | 6 | | | T Tulasne | 6 | 6 | | | | | | | | | | |
| | S Youl | 2 | 1 | | 8 | F Davín | 3 | 2 | | | | | | | | | | |
| 8 | F Davín | 6 | 6 | | | | | | | | | | | | 1 | G Pérez Roldán | 6 | 6 |
| 4 | M Střelba | 1 | 0 | | | | | | | | | | | | 6 | T Carbonell | 1 | 1 |
| | F Luna | 6 | 6 | | | F Luna | 3 | 6$^3$ | | | | | | | | | | |
| | L Jönsson | 3 | 5 | | | R Azar | 6 | 7$^7$ | | | | | | | | | | |
| | R Azar | 6 | 7 | | | | | | | | R Azar | 5 | 6 | 3 | | | | |
| | M Wostenholme | 6 | 6 | | | | | | | 6 | T Carbonell | 7 | 2 | 6 | | | | |
| WC | K Outaleb | 4 | 4 | | | M Wostenholme | 1 | 4 | | | | | | | | | | |
| | F Roig | 4 | 2 | | 6 | T Carbonell | 6 | 6 | | | | | | | | | | |
| 6 | T Carbonell | 6 | 6 | | | | | | | | | | | | | | | |

### 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 | Semifinals |
| 5 | P Haarhuis | 6 | 2 | 3 | | | | | | | | | | | | | |
| Q | N Utgren | 1 | 6 | 6 | Q | N Utgren | 6 | 4 | 3 | | | | | | | | |
| WC | K Alami | 4 | 5 | | | J Anderson | 0 | 6 | 6 | | | | | | | | |
| | J Anderson | 6 | 7 | | | | | | | | J Anderson | 3 | 1 | | | | |
| Q | T Champion | 6 | 6 | | | | | | | 3 | G Prpić | 6 | 6 | | | | |
| | J Stoltenberg | 3 | 2 | | Q | T Champion | 5 | 6$^6$ | | | | | | | | | |
| WC | Y El Aynaoui | 2 | 6$^7$ | | 3 | G Prpić | 7 | 7$^8$ | | | | | | | | | |
| 3 | G Prpić | 6 | 7$^9$ | | | | | | | | | | | 3 | G Prpić | 1 | 3 |
| 7 | M Koevermans | 6 | 6 | | | | | | | | | | | 2 | T Muster | 6 | 6 |
| | S Colombo | 1 | 4 | | 7 | M Koevermans | 6 | 1 | 6 | | | | | | | | |
| | M Vajda | 6 | 6 | | | M Vajda | 1 | 6 | 3 | | | | | | | | |
| | J F Altur | 3 | 2 | | | | | | | 7 | M Koevermans | 4 | 6$^4$ | | | | |
| | T Benhabiles | 6 | 6 | | | | | | | 2 | T Muster | 6 | 7$^7$ | | | | |
| | L Lavalle | 0 | 2 | | | T Benhabiles | 6 | 1 | 2 | | | | | | | | |
| | A Võsand | 2 | 5 | | 2 | T Muster | 4 | 6 | 6 | | | | | | | | |
| 2 | T Muster | 6 | 7 | | | | | | | | | | | | | | |