# 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)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Martina Navratilova | 6 | 6 | | | | | |
| 3 | Monica Seles | 3 | 0 | | | | | |
| 3 | Monica Seles | 3 | 0 | | 1 | Martina Navratilova | 6 | 6 |
| | | | | | 2 | Zina Garrison | 1 | 0 |
| 4 | Natasha Zvereva | 2 | 6 | 3 | 2 | Zina Garrison | 1 | 0 |
| 2 | Zina Garrison | 6 | 3 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | M Navratilova | 6 | 6 | | | | | | | | | |
| | R Fairbank | 6 | 2 | 6$^5$ | | A Grossman | 0 | 0 | | | | | | | | | |
| | A Grossman | 3 | 6 | 7$^7$ | | | | | | 1 | M Navratilova | 6 | 6 | | | | |
| | C Kohde-Kilsch | 6 | 4 | 6 | | | | | | | A Smith | 4 | 2 | | | | |
| | D Van Rensburg | 1 | 6 | 3 | | C Kohde-Kilsch | 3 | 3 | | | | | | | | | |
| | A Smith | 6 | 6 | | | A Smith | 6 | 6 | | | | | | | | | |
| 5 | H Kelesi | 1 | 2 | | | | | | | | | | | 1 | M Navratilova | 6 | 6 |
| | | | | | | | | | | | | | | 3 | M Seles | 3 | 0 |
| | | | | | 3 | M Seles | w/o | | | | | | | | | | |
| | K Adams | 6$^2$ | 6 | 5 | | S Martin | | | | | | | | | | | |
| | S Martin | 7$^7$ | 4 | 7 | | | | | | 3 | M Seles | 6 | 7$^7$ | | | | |
| | P Fendick | 6 | 6 | | | | | | | 7 | P Shriver | 2 | 6$^5$ | | | | |
| | A Henricksson | 2 | 1 | | | P Fendick | 3 | 6 | 4 | | | | | | | | |
| | E Burgin | 0 | 2 | | 7 | P Shriver | 6 | 3 | 6 | | | | | | | | |
| 7 | P Shriver | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | L Gildemeister | 4 | 6 | 6 | | | | | | | | | | | | | | | |
| | S Hanika | 6 | 4 | 2 | 6 | L Gildemeister | 3 | 3 | | | | | | | | | | | |
| | N Provis | 6 | 7$^7$ | | | N Provis | 6 | 6 | | | | | | | | | | | |
| | A Temesvári | 3 | 6$^1$ | | | | | | | | N Provis | 7 | 3 | 4 | | | | | |
| | H Cioffi | 6 | 6 | | | | | | | 4 | N Zvereva | 5 | 6 | 6 | | | | | |
| WC | J Ingram | 3 | 3 | | | H Cioffi | 6 | 2 | 3 | | | | | | | | | | |
| | | | | | 4 | N Zvereva | 4 | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 4 | N Zvereva | 2 | 6 | 3 |
| 8 | N Tauziat | 7 | 6 | | | | | | | | | | | | 2 | Z Garrison | 6 | 3 | 6 |
| | K Rinaldi | 5 | 3 | | 8 | N Tauziat | 6 | 6 | | | | | | | | | | | |
| WC | E Rossides | 0 | 3 | | | L Ferrando | 2 | 4 | | | | | | | | | | | |
| | L Ferrando | 6 | 6 | | | | | | | 8 | N Tauziat | 0 | 6$^4$ | | | | | | |
| | L McNeil | 2 | 6 | 6$^6$ | | | | | | 2 | Z Garrison | 6 | 7$^7$ | | | | | | |
| | E Smylie | 6 | 4 | 7$^8$ | | E Smylie | 0 | 1 | | | | | | | | | | | |
| | | | | | 2 | Z Garrison | 6 | 6 | | | | | | | | | | | |