1990 Italian Open – Men's singles

Thomas Muster defeated Andrei Chesnokov in the final, 6–1, 6–3, 6–1 to win the men's singles tennis title at the 1990 Italian Open.

Alberto Mancini was the defending champion, but lost to Chesnokov in the quarterfinals.

Seeds
• # 🇺🇸 Brad Gilbert (third round)

• # 🇺🇸 Aaron Krickstein (third round)

• # 🇪🇨 Andrés Gómez (semifinals)

• # 🇪🇸 Emilio Sánchez (semifinals)

• # 🇺🇸 Jay Berger (second round)

• # 🇦🇷 Martín Jaite (third round)

• # 🇺🇸 Michael Chang (first round)

• # Andrei Chesnokov (final)

• # 🇺🇸 Jim Courier (third round)

• # 🇦🇹 Thomas Muster (champion)

• # 🇸🇪 Mats Wilander (withdrew)

• # 🇦🇷 Guillermo Pérez Roldán (quarterfinals)

• # 🇸🇪 Jonas Svensson (third round)

• # 🇸🇪 Magnus Gustafsson (third round)

• # Petr Korda (first round)

• # 🇦🇷 Alberto Mancini (quarterfinals)