| Singles | |
|---|---|
| 1988 Virginia Slims of Washington | |
| 1987 Champion |  Hana Mandlíková |
| Champion |  Martina Navratilova |
| Runner-up | Pam Shriver |
| Final score | 6–0, 6–2 |
Hana Mandlíková was the defending champion but lost in the semifinals to Martina Navratilova.
Navratilova won in the final 6–0, 6–2 against Pam Shriver.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
Martina Navratilova (champion) Pam Shriver (final)
Gabriela Sabatini (semifinals)
Hana Mandlíková (semifinals) Helena Suková (quarterfinals) Zina Garrison (quarterfinals) Barbara Potter (quarterfinals)
Natasha Zvereva (quarterfinals)Martina Navratilova was the defending champion and won in the final 6–4, 6–0 against Chris Evert-Lloyd.
Martina Navratilova and Pam Shriver were the defending champions but only Navratilova competed that year with Candy Reynolds.
Martina Navratilova and Pam Shriver were the defending champions but did not compete that year.
Pam Shriver was the defending champion but lost in the quarterfinals to Terry Phelps.
Zina Garrison and Eva Pfaff were the defending champions but did not compete that year.
Chris Evert was the defending champion of the singles event at the Virginia Slims of Los Angeles tennis tournament but did not compete that year.
Patty Fendick and Jill Hetherington were the defending champions of the doubles event at the 1989 Virginia Slims of Los Angeles tennis tournament but lost in the quarterfinals to Elizabeth Smylie and Janine Tremelling.
Billie Jean King and Martina Navratilova were the defending champions but only Navratilova competed that year with Pam Shriver.
Kathy Jordan and Anne Smith were the defending champions but lost in the quarterfinals to Bettina Bunge and Claudia Kohde-Kilsch.
Rosemary Casals and Wendy Turnbull were the defending champions but lost in the quarterfinals to Mima Jaušovec and Kathy Jordan.
Martina Navratilova and Pam Shriver were the defending champions but lost in the final 6–7(5–7), 6–2, 6–3 against Claudia Kohde-Kilsch and Helena Suková.
Claudia Kohde-Kilsch and Helena Suková were the defending champions but lost in the quarterfinals to Elise Burgin and Rosalyn Fairbank.
Martina Navratilova and Pam Shriver were the defending champions and won in the final 5–7, 6–4, 6–2 against Kathy Jordan and Elizabeth Smylie.
Gigi Fernández and Robin White were the defending champions but lost in the quarterfinals to Steffi Graf and Gabriela Sabatini.
Kathy Jordan and Elizabeth Smylie were the defending champions, but decided not to play together. Jordan competed with Alycia Moulton but lost in the third round to Hana Mandlíková and Wendy Turnbull, while Smylie played with Catherine Tanvier but lost in the quarterfinals to Martina Navratilova and Pam Shriver.
Betsy Nagelsen and Martina Navratilova were the defending champions but they competed with different partners that year, Nagelsen with Candy Reynolds and Navratilova with Pam Shriver.
Martina Navratilova and Pam Shriver were the defending champions and won in the final 6–3, 6–4 against Claudia Kohde-Kilsch and Helena Suková.
Martina Navratilova and Pam Shriver were the defending champions and won in the final 6–0, 7–5 against Chris Evert and Wendy Turnbull.
Martina Navratilova was the defending champion and defended her title against Hana Mandlíková 6–2, 6–0, 3–6, 6–2.
Martina Navratilova and Pam Shriver were the defending champions, but were eliminated in semifinals.
