1990 Campionati Internazionali di Sicilia – Singles

Guillermo Pérez Roldán was the defending champion, but lost in the semifinals to tournament runner-up Juan Aguilera.

Franco Davín won the title by defeating Aguilera 6–1, 6–1 in the final.

Seeds
• # 🇪🇸 Emilio Sánchez (first round)

• # 🇦🇷 Guillermo Pérez Roldán (semifinals)

• # 🇪🇸 Juan Aguilera (final)

• # 🇦🇹 Horst Skoff (first round)

• # 🇪🇸 Sergi Bruguera (first round)

• # 🇮🇹 Omar Camporese (second round)

• # 🇦🇷 Franco Davín (champion)

• # Goran Prpić (second round)