# 1991 Mazda Classic – Singles

Steffi Graf was the defending champion, but did not compete this year.
Jennifer Capriati won the title by defeating Monica Seles 4–6, 6–1, 7–6$^{(7–2)}$ in the final.

## Seeds

The first four seeds received a bye into the second round.
* Monica Seles (final)
* Conchita Martínez (semifinals)
* Manuela Maleeva-Fragnière (quarterfinals)
* Jennifer Capriati (champion)
* Zina Garrison (quarterfinals)
* Nathalie Tauziat (semifinals)
* Barbara Paulus (second round)
* Laura Gildemeister (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 | Final |
| 1 | Monica Seles | 6 | 6 | | | | | |
| 6 | Nathalie Tauziat | 1 | 2 | | | | | |
| 6 | Nathalie Tauziat | 1 | 2 | 1 | Monica Seles | 6 | 1 | 6$^2$ |
| | | | | 4 | Jennifer Capriati | 4 | 6 | 7$^7$ |
| 4 | Jennifer Capriati | 6 | 6 | 4 | Jennifer Capriati | 4 | 6 | 7$^7$ |
| 2 | Conchita Martínez | 4 | 0 | | | | | |

### 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 Seles | 6 | 6 | | | | | | | | | |
| | P Shriver | 6 | 6 | | | P Shriver | 2 | 2 | | | | | | | | | |
| | J Durie | 3 | 4 | | | | | | | 1 | M Seles | 6 | 6 | | | | |
| | A Kijimuta | 6 | 1 | 6 | | | | | | | A Minter | 0 | 3 | | | | |
| Q | J Emmons | 4 | 6 | 4 | | A Kijimuta | 3 | 7 | 5 | | | | | | | | |
| | A Minter | 6 | 6 | | | A Minter | 6 | 5 | 7 | | | | | | | | |
| 8 | L Gildemeister | 3 | 4 | | | | | | | | | | | 1 | M Seles | 6 | 6 |
| | | | | | | | | | | | | | | 6 | N Tauziat | 1 | 2 |
| | | | | | 3 | M Maleeva-Fragnière | 6$^4$ | 6 | 6 | | | | | | | | |
| | P Louie Harper | 3 | 3 | | Q | K Po | 7$^7$ | 3 | 2 | | | | | | | | |
| Q | K Po | 6 | 6 | | | | | | | 3 | M Maleeva-Fragnière | 3 | 3 | | | | |
| LL | N Herreman | 3 | 1 | | | | | | | 6 | N Tauziat | 6 | 6 | | | | |
| | A May | 6 | 6 | | | A May | 3 | 4 | | | | | | | | | |
| | K Rinaldi | 3 | 6 | 4 | 6 | N Tauziat | 6 | 6 | | | | | | | | | |
| 6 | N Tauziat | 6 | 4 | 6 | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | Z Garrison | 6 | 6 | | | | | | | | | | | | | |
| | R Fairbank-Nideffer | 3 | 4 | | 5 | Z Garrison | 6 | 6 | | | | | | | | |
| | K Quentrec | 6 | 5 | 6 | | K Quentrec | 2 | 1 | | | | | | | | |
| | C Kohde-Kilsch | 4 | 7 | 4 | | | | | 5 | Z Garrison | 1 | 4 | | | | |
| | N Sawamatsu | 6 | 1 | 1 | | | | | 4 | J Capriati | 6 | 6 | | | | |
| | L McNeil | 3 | 6 | 6 | | L McNeil | 2 | 1 | | | | | | | | |
| | | | | | 4 | J Capriati | 6 | 6 | | | | | | | | |
| | | | | | | | | | | | | | 4 | J Capriati | 6 | 6 |
| 7 | B Paulus | 6 | 6 | | | | | | | | | | 2 | C Martínez | 4 | 0 |
| | C Papadáki | 2 | 3 | | 7 | B Paulus | 3 | 4 | | | | | | | | |
| Q | E deLone | 1 | 0 | | Q | D Graham | 6 | 6 | | | | | | | | |
| Q | D Graham | 6 | 6 | | | | | | Q | D Graham | 0 | 5 | | | | |
| | H Cioffi | 6 | 1 | 1 | | | | | 2 | C Martínez | 6 | 7 | | | | |
| | M Werdel | 0 | 6 | 6 | | M Werdel | 3 | 1 | | | | | | | | |
| | | | | | 2 | C Martínez | 6 | 6 | | | | | | | | |