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

 * 1) 🇦🇷 Guillermo Pérez Roldán (final)
 * 2) 🇦🇹 Thomas Muster (champion)
 * 3)  Goran Prpić (semifinals)
 * 4)  Martin Střelba (first round)
 * 5)  Paul Haarhuis (first round)
 * 6) 🇪🇸 Tomás Carbonell (semifinals)
 * 7)  Mark Koevermans (quarterfinals)
 * 8) 🇦🇷 Franco Davín (second round)