1990 Czechoslovak Open – Singles

Marcelo Filippini was the defending champion, but lost in the second round to Nicklas Kulti.

Jordi Arrese won the title by defeating Kulti 7–6, 7–6 in the final.

Seeds
• # 🇦🇹 Thomas Muster (first round, retired)

• # 🇦🇷 Guillermo Pérez Roldán (first round, retired)

• # 🇦🇹 Horst Skoff (quarterfinals)

• # Marcelo Filippini (second round)

• # 🇦🇷 Franco Davín (quarterfinals)

• # Goran Prpić (semifinals)

• # 🇸🇪 Magnus Larsson (first round)

• # 🇪🇸 Jordi Arrese (champion)