1989 Porsche Tennis Grand Prix – Singles

Martina Navratilova was the three-time defending champion, but did not compete this year.

Gabriela Sabatini won the title by defeating Mary Joe Fernández 7–6(7–5), 6–4 in the final. As a result, Sabatini won a Porsche 944 S2 for winning the tournament.

Seeds
• # 🇦🇷 Gabriela Sabatini (champion)

• # 🇺🇸 Zina Garrison (semifinals)

• # Helena Suková (first round)

• # Monica Seles (quarterfinals)

• # 🇺🇸 Mary Joe Fernández (final)

• # 🇦🇺 Hana Mandlíková (quarterfinals)

• # 🇮🇹 Raffaella Reggi (second round)

• # 🇦🇹 Barbara Paulus (first round)