1991 Estoril Open – Singles

Sergi Bruguera won in the final 7–6(9–7), 6–1, defeating Karel Nováček.

Seeds
• # 🇪🇨 Andrés Gómez (first round)

• # 🇪🇸 Emilio Sánchez (first round)

• # 🇷🇺 Andrei Chesnokov (semifinals)

• # 🇷🇺 Andrei Cherkasov (first round)

• # Marc Rosset (first round)

• # 🇪🇸 Juan Aguilera (first round)

• # 🇦🇷 Karel Nováček (finals)

• # 🇪🇸 Sergi Bruguera (champion)