# 1991 Arizona Classic – Singles

Conchita Martínez was the defending champion, but did not compete this year.
Sabine Appelmans won the title by defeating Chanda Rubin 7–5, 6–1 in the final.

## Seeds

* Gigi Fernández (second round)
* Julie Halard (semifinals)
* Sabine Appelmans (champion)
* Amy Frazier (second round)
* Marianne Werdel (first round)
* Yayuk Basuki (first round)
* Barbara Rittner (first round)
* Debbie Graham (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 | Semifinals | Final | Final | Final | Final |
| Q | Chanda Rubin | 6 | 6 | | | | | |
| | Karina Habšudová | 2 | 4 | | | | | |
| | Karina Habšudová | 2 | 4 | | Q | Chanda Rubin | 5 | 1 |
| | | | | | 3 | Sabine Appelmans | 7 | 6 |
| 3 | Sabine Appelmans | 3 | 6 | 6 | 3 | Sabine Appelmans | 7 | 6 |
| 2 | Julie Halard | 6 | 3 | 3 | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | G Fernández | 6 | 6 | | | | | | | | | | | | | | | |
| | E Reinach | 2 | 2 | | 1 | G Fernández | 4 | 2 | | | | | | | | | | |
| | S Hack | 0 | 2 | | | G Helgeson | 6 | 6 | | | | | | | | | | |
| | G Helgeson | 6 | 6 | | | | | | | | G Helgeson | 3 | 5 | | | | | |
| Q | C Rubin | 6 | 6 | | | | | | | Q | C Rubin | 6 | 7 | | | | | |
| | E Smylie | 3 | 0 | | Q | C Rubin | 6$^2$ | 6 | 6 | | | | | | | | | |
| | P Harper | 6$^5$ | 6 | 6 | | P Harper | 7$^7$ | 0 | 3 | | | | | | | | | |
| 6 | Y Basuki | 7$^7$ | 3 | 2 | | | | | | | | | | | Q | C Rubin | 6 | 6 |
| 4 | A Frazier | 6 | 6 | | | | | | | | | | | | | K Habšudová | 2 | 4 |
| | F Labat | 3 | 1 | | 4 | A Frazier | 3 | 6$^6$ | | | | | | | | | | |
| | K Habšudová | 6 | 7 | | | K Habšudová | 6 | 7$^8$ | | | | | | | | | | |
| Q | J Emmons | 1 | 5 | | | | | | | | K Habšudová | 4 | 6 | 6 | | | | |
| Q | K Po | 3 | 7 | 6 | | | | | | Q | K Po | 6 | 1 | 3 | | | | |
| | I Demongeot | 6 | 5 | 3 | Q | K Po | 6 | 1 | 6 | | | | | | | | | |
| | T Whitlinger | 6 | 4 | 7 | | T Whitlinger | 1 | 6 | 2 | | | | | | | | | |
| 8 | D Graham | 3 | 6 | 5 | | | | | | | | | | | | | | |

### 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 |
| 7 | B Rittner | 5 | 3 | | | | | | | | | | | | | | | | |
| | N Provis | 7 | 6 | | | N Provis | 7$^8$ | 6 | | | | | | | | | | | |
| Q | R White | 6 | 6 | | Q | R White | 6$^6$ | 1 | | | | | | | | | | | |
| | V Martinek | 3 | 2 | | | | | | | | N Provis | 6$^5$ | 4 | | | | | | |
| | L Harvey Wild | 2 | 4 | | | | | | | 3 | S Appelmans | 7$^7$ | 6 | | | | | | |
| | C Cunningham | 6 | 6 | | | C Cunningham | 5 | 0 | | | | | | | | | | | |
| | A Gavaldón | 5 | 3 | | 3 | S Appelmans | 7 | 6 | | | | | | | | | | | |
| 3 | S Appelmans | 7 | 6 | | | | | | | | | | | | 3 | S Appelmans | 3 | 6 | 6 |
| 5 | M Werdel | 6 | 4 | 4 | | | | | | | | | | | 2 | J Halard | 6 | 3 | 3 |
| | P Ritter | 2 | 6 | 6 | | P Ritter | 6$^5$ | 1 | | | | | | | | | | | |
| | C Tessi | 6 | 4 | 4 | | P Fendick | 7$^7$ | 6 | | | | | | | | | | | |
| | P Fendick | 3 | 6 | 6 | | | | | | | P Fendick | 6 | 4 | 1 | | | | | |
| | A Grossman | 6 | 6 | | | | | | | 2 | J Halard | 4 | 6 | 6 | | | | | |
| | A May | 1 | 3 | | | A Grossman | 6 | 4 | 4 | | | | | | | | | | |
| | S Stafford | 2 | 6 | 4 | 2 | J Halard | 3 | 6 | 6 | | | | | | | | | | |
| 2 | J Halard | 6 | 3 | 6 | | | | | | | | | | | | | | | |