# 1991 Virginia Slims of Houston – Singles

Katerina Maleeva was the defending champion, but lost in the second round to Christína Papadáki.
Monica Seles won the title by defeating Mary Joe Fernández 6–4, 6–3 in the final.

## Seeds

The first four seeds received a bye into the second round.
* Monica Seles (champion)
* Mary Joe Fernández (final)
* Zina Garrison (second round)
* Katerina Maleeva (quarterfinals)
* Leila Meskhi (withdrew)
* Sandra Cecchini (semifinals)
* Susan Sloane (first round)
* Mercedes Paz (first round)
* Gretchen Magers (first round)

## 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 | Final | Final | Final | Final |
| 1 | Monica Seles | 6 | 6 | | | | |
| 6 | Sandra Cecchini | 0 | 2 | | | | |
| 6 | Sandra Cecchini | 0 | 2 | 1 | Monica Seles | 6 | 6 |
| | | | | 2 | Mary Joe Fernández | 4 | 3 |
| | Linda Harvey Wild | 0 | 3 | 2 | Mary Joe Fernández | 4 | 3 |
| 2 | Mary Joe Fernández | 6 | 6 | | | | |

### Top half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | 1 | M Seles | 6 | 6 | | | | | | | | | |
| | R Zrubáková | 6 | 6 | | R Zrubáková | 0 | 2 | | | | | | | | | |
| | P Langrová | 2 | 2 | | | | | 1 | M Seles | 6 | 6 | | | | | |
| | P Tarabini | 7$^7$ | 6 | | | | | | F Bonsignori | 1 | 0 | | | | | |
| | S Rehe | 6$^2$ | 2 | | P Tarabini | 4 | 4 | | | | | | | | | |
| | F Bonsignori | 6 | 6 | | F Bonsignori | 6 | 6 | | | | | | | | | |
| 7 | S Sloane | 0 | 0 | | | | | | | | | | 1 | M Seles | 6 | 6 |
| | | | | | | | | | | | | | 6 | S Cecchini | 0 | 2 |
| | | | | 4 | K Maleeva | 6 | 6 | | | | | | | | | |
| WC | C Papadáki | 6 | 6 | WC | C Papadáki | 3 | 2 | | | | | | | | | |
| | P Hy | 4 | 3 | | | | | 4 | K Maleeva | 6 | 4 | 1 | | | | |
| Q | L Allen | 2 | 3 | | | | | 6 | S Cecchini | 3 | 6 | 6 | | | | |
| LL | Ca MacGregor | 6 | 6 | LL | Ca MacGregor | 1 | 3 | | | | | | | | | |
| WC | P Nelson | 4 | 2 | 6 | S Cecchini | 6 | 6 | | | | | | | | | |
| 6 | S Cecchini | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 9 | G Magers | 4 | 6 | 4 | | | | | | | | | | | | | |
| | T Whitlinger | 6 | 1 | 6 | | T Whitlinger | 4 | 3 | | | | | | | | | |
| | L Harvey Wild | 6 | 4 | 6 | | L Harvey Wild | 6 | 6 | | | | | | | | | |
| Q | G Mosca | 1 | 6 | 1 | | | | | | | L Harvey Wild | 6 | 6 | | | | |
| | G Fernández | 4 | 7 | 6 | | | | | | | G Fernández | 4 | 1 | | | | |
| | ML Daniels | 6 | 5 | 4 | | G Fernández | 6$^5$ | 6 | 7 | | | | | | | | |
| | | | | | 3 | Z Garrison | 7$^7$ | 1 | 5 | | | | | | | | |
| | | | | | | | | | | | | | | | L Harvey Wild | 0 | 3 |
| 8 | M Paz | 3 | 1 | | | | | | | | | | | 2 | MJ Fernández | 6 | 6 |
| Q | S Smith | 6 | 6 | | Q | S Smith | 4 | 1 | | | | | | | | | |
| | A Grossman | 6 | 3 | 7$^7$ | | A Grossman | 6 | 6 | | | | | | | | | |
| Q | S La Fratta | 1 | 6 | 6$^0$ | | | | | | | A Grossman | 5 | 5 | | | | |
| | L Garrone | 6 | 3 | 1 | | | | | | 2 | MJ Fernández | 7 | 7 | | | | |
| | H Cioffi | 1 | 6 | 6 | | H Cioffi | | | | | | | | | | | |
| | | | | | 2 | MJ Fernández | w/o | | | | | | | | | | |