# 1991 Prudential-Bache Securities Classic – Singles

Brad Gilbert was the defending champion, but lost in the quarterfinals to MaliVai Washington.
Andre Agassi won the title by defeating Derrick Rostagno 6–2, 1–6, 6–3 in the final.

## Seeds

* Andre Agassi (champion)
* Pete Sampras (semifinals)
* Brad Gilbert (quarterfinals)
* Derrick Rostagno (final)
* Scott Davis (first round)
* Jimmy Arias (quarterfinals)
* Grant Connell (first round)
* David Pate (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 | Final | Final | Final | Final | Final |
| 1 | Andre Agassi | 6 | 7$^8$ | | | | | |
| | MaliVai Washington | 4 | 6$^6$ | | | | | |
| | MaliVai Washington | 4 | 6$^6$ | 1 | Andre Agassi | 6 | 1 | 6 |
| | | | | 4 | Derrick Rostagno | 2 | 6 | 3 |
| 4 | Derrick Rostagno | 7 | 6 | 4 | Derrick Rostagno | 2 | 6 | 3 |
| 2 | Pete Sampras | 5 | 4 | | | | | |

### 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 | A Agassi | 6 | 6 | | | | | | | | | | | | | | | |
| | B Garrow | 2 | 4 | | 1 | A Agassi | 6 | 6 | | | | | | | | | | |
| | D Marcelino | 3 | 6 | 6$^4$ | | D Engel | 4 | 4 | | | | | | | | | | |
| | D Engel | 6 | 3 | 7$^7$ | | | | | | 1 | A Agassi | 6 | 7$^7$ | | | | | |
| Q | TJ Middleton | 3 | 1 | | | | | | | | C Adams | 4 | 6$^4$ | | | | | |
| | B Shelton | 6 | 6 | | | B Shelton | 6 | 6$^6$ | 6$^4$ | | | | | | | | | |
| | C Adams | 6 | 4 | 6 | | C Adams | 3 | 7$^8$ | 7$^7$ | | | | | | | | | |
| 7 | G Connell | 3 | 6 | 3 | | | | | | | | | | | 1 | A Agassi | 6 | 7$^8$ |
| 3 | B Gilbert | 2 | 6 | 6 | | | | | | | | | | | | MV Washington | 4 | 6$^6$ |
| | P Rebolledo | 6 | 1 | 1 | 3 | B Gilbert | 6 | 7$^7$ | | | | | | | | | | |
| | B Wuyts | 4 | 2 | | | P Baur | 3 | 6$^5$ | | | | | | | | | | |
| | P Baur | 6 | 6 | | | | | | | 3 | B Gilbert | 2 | 7$^8$ | 2 | | | | |
| | L Herrera | 6 | 5 | 4 | | | | | | | MV Washington | 6 | 6$^6$ | 6 | | | | |
| | MV Washington | 4 | 7 | 6 | | MV Washington | 6 | 6 | | | | | | | | | | |
| Q | N Pereira | 7 | 6 | | Q | N Pereira | 1 | 3 | | | | | | | | | | |
| 5 | S Davis | 5 | 1 | | | | | | | | | | | | | | | |

### 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 |
| 6 | J Arias | 7$^7$ | 2 | 6 | | | | | | | | | | | | | |
| Q | D Macpherson | 6$^4$ | 6 | 4 | 6 | J Arias | 6$^2$ | 7$^7$ | 6 | | | | | | | | |
| WC | D Witt | 7$^8$ | 6 | | WC | D Witt | 7$^7$ | 6$^3$ | 1 | | | | | | | | |
| WC | T Mayotte | 6$^6$ | 2 | | | | | | | 6 | J Arias | 1 | 4 | | | | |
| | T Högstedt | 3 | 6 | 6 | | | | | | 4 | D Rostagno | 6 | 6 | | | | |
| | J Anderson | 6 | 3 | 2 | | T Högstedt | 6 | 2 | 2 | | | | | | | | |
| WC | J Connors | 1 | 4 | | 4 | D Rostagno | 4 | 6 | 6 | | | | | | | | |
| 4 | D Rostagno | 6 | 6 | | | | | | | | | | | 4 | D Rostagno | 7 | 6 |
| 8 | D Pate | 6 | 7$^7$ | | | | | | | | | | | 2 | P Sampras | 5 | 4 |
| | C Garner | 3 | 6$^2$ | | 8 | D Pate | 6 | 6$^4$ | 6 | | | | | | | | |
| | J Tarango | 7$^7$ | 6 | | | J Tarango | 2 | 7$^7$ | 1 | | | | | | | | |
| Q | K Flach | 6$^5$ | 4 | | | | | | | 8 | D Pate | 3 | 3 | | | | |
| | D Nargiso | 6 | 7$^7$ | | | | | | | 2 | P Sampras | 6 | 6 | | | | |
| LL | R Matuszewski | 3 | 6$^5$ | | | D Nargiso | 3 | 6$^8$ | | | | | | | | | |
| | B Pearce | 2 | 2 | | 2 | P Sampras | 6 | 7$^{10}$ | | | | | | | | | |
| 2 | P Sampras | 6 | 6 | | | | | | | | | | | | | | |