1991 Czechoslovak Open – Singles

The 1991 PCzechoslovak Open was a men's tennis tournament played on Clay in Prague, Czech Republic that was part of the International Series of the 1991 ATP Tour. Jordi Arrese was the defending champion but lost in the second round to Thomas Muster.

Karel Nováček won the title by defeating Magnus Gustafsson 7–6(7–5), 6–2 in the final.

Seeds
• # 🇸🇪 Magnus Gustafsson (final)

• # Karel Nováček (champion)

• # Goran Prpić (first round)

• # 🇦🇹 Horst Skoff (quarterfinals)

• # 🇪🇸 Jordi Arrese (second round)

• # 🇦🇷 Guillermo Pérez Roldán (semifinals)

• # 🇦🇷 Horacio de la Peña (quarterfinals)

• # 🇸🇪 Nicklas Kulti (first round)