1990 Virginia Slims of Washington – Singles

Steffi Graf was the defending champion, but did not compete this year.

Martina Navratilova won the title by defeating Zina Garrison 6–1, 6–0 in the final.

Seeds
The top four seeds received a bye to the second round. • # 🇺🇸 Martina Navratilova (champion)

• # 🇺🇸 Zina Garrison (final)

• # Monica Seles (semifinals)

• # Natasha Zvereva (semifinals)

• # 🇨🇦 Helen Kelesi (first round)

• # 🇵🇪 Laura Gildemeister (second round)

• # 🇺🇸 Pam Shriver (quarterfinals)

• # 🇫🇷 Nathalie Tauziat (quarterfinals)