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. Draw Finals Top half Bottom half References External links Official results archive (ITF) Official results archive (WTA) Toray Pan Pacific Open Pan Pacific Open 1990 Toray Pan Pacific Open