1991 Porsche Tennis Grand Prix – Singles

Mary Joe Fernández was the defending champion, but lost in the quarterfinals to Helena Suková.

16-year old Anke Huber won the title by defeating Martina Navratilova 2–6, 6–2, 7–6(7–4) in the final.

Seeds
• # 🇺🇸 Martina Navratilova (final)

• # 🇺🇸 Mary Joe Fernández (quarterfinals)

• # 🇪🇸 Conchita Martínez (first round)

• # Jana Novotná (quarterfinals)

• # 🇺🇸 Zina Garrison (quarterfinals)

• # Leila Meskhi (second round)

• # Helena Suková (semifinals)

• # 🇫🇷 Nathalie Tauziat (quarterfinals)