1990 Toray Pan Pacific Open – Singles

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

Steffi Graf won the title by defeating Arantxa Sánchez Vicario 6–1, 6–2 in the final.

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

• # 🇪🇸 Arantxa Sánchez Vicario (final)

• # Manuela Maleeva-Fragnière (semifinals)

• # (n/a)

• # Larisa Savchenko (quarterfinals)

• # 🇺🇸 Gigi Fernández (quarterfinals)

• # 🇺🇸 Lori McNeil (first round)

• # 🇦🇺 Anne Minter (first round)