1990 Lufthansa Cup German Open – Singles

Monica Seles defeated the defending champion Steffi Graf in the final, 6–4, 6–3 to win the singles tennis title at the 1990 WTA German Open.

Seeds
The top 8 seeds received a bye to the second round.• # Steffi Graf (final)

• # Monica Seles (champion)

• # 🇦🇷 Gabriela Sabatini (third round)

• # 🇺🇸 Mary Joe Fernández (third round)

• # 🇧🇬 Katerina Maleeva (third round)

• # 🇪🇸 Conchita Martínez (quarterfinal)

• # Jana Novotná (quarterfinal)

• # Natalia Zvereva (semifinal)

• # 🇦🇹 Judith Wiesner (quarterfinal)

• # 🇫🇷 Nathalie Tauziat (quarterfinal)

• # n/a

• # Isabel Cueto (first round)

• # n/a

• # Leila Meskhi (quarterfinal)

• # 🇸🇪 Catarina Lindqvist (quarterfinal)

• # 🇦🇺 Hana Mandlíková (second round)