1990 Dutch Open – Singles

Karel Nováček was the defending champion, but lost in the first round this year.

Francisco Clavet won the tournament, beating Eduardo Masso in the final, 3–6, 6–4, 6–2, 6–0.

Seeds
• # 🇪🇸 Emilio Sánchez (semifinals)

• # 🇦🇷 Martín Jaite (quarterfinals)

• # 🇪🇸 Juan Aguilera (second round)

• # 🇦🇷 Guillermo Pérez Roldán (first round)

• # Marc Rosset (first round, retired)

• # 🇩🇪 Carl-Uwe Steeb (first round)

• # 🇦🇹 Horst Skoff (first round)

• # Karel Nováček (first round)