1990 Citizen Cup – Singles

Steffi Graf won her fourth consecutive title at Hamburg by defeating Arantxa Sánchez Vicario 5–7, 6–0, 6–1 in the final.

Seeds
The first eight seeds received a bye into the second round. • # Steffi Graf (champion)

• # 🇺🇸 Martina Navratilova (semifinals)

• # 🇪🇸 Arantxa Sánchez Vicario (final)

• # 🇧🇬 Katerina Maleeva (second round, withdrew)

• # Helena Suková (quarterfinals)

• # 🇫🇷 Nathalie Tauziat (third round)

• # 🇵🇪 Laura Gildemeister (third round)

• # 🇦🇹 Judith Wiesner (semifinals)

• # Isabel Cueto (third round)

• # (n/a)

• # Leila Meskhi (quarterfinals)

• # Larisa Savchenko-Neiland (first round)

• # (n/a)

• # Radka Zrubáková (first round)

• # Cathy Caverzasio (second round)

• # Sylvia Hanika (third round)