# 1991 Australian Indoor Championships – Singles

Boris Becker was the defending champion but did not compete that year.
Stefan Edberg won in the final 6–2, 6–2, 6–2 against Brad Gilbert.

## Seeds

All sixteen seeds received a bye to the second round.
* Stefan Edberg (champion)
* Ivan Lendl (third round)
* Pete Sampras (semifinals)
* Andre Agassi (quarterfinals)
* David Wheaton (quarterfinals)
* Goran Ivanišević (semifinals)
* Derrick Rostagno (second round)
* Michael Chang (quarterfinals)
* Brad Gilbert (final)
* Andrei Chesnokov (second round)
* Richey Reneberg (third round)
* Aaron Krickstein (second round)
* Todd Woodbridge (third round)
* MaliVai Washington (third round)
* Wally Masur (second round)
* Wayne Ferreira (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 | Final |
| 1 | Stefan Edberg | 4 | 7$^7$ | 7$^7$ | | | | | |
| 6 | Goran Ivanišević | 6 | 6$^2$ | 6$^5$ | | | | | |
| 6 | Goran Ivanišević | 6 | 6$^2$ | 6$^5$ | 1 | Stefan Edberg | 6 | 6 | 6 |
| | | | | | 9 | Brad Gilbert | 2 | 2 | 2 |
| 3 | Pete Sampras | 6 | 5 | 3 | 9 | Brad Gilbert | 2 | 2 | 2 |
| 9 | Brad Gilbert | 1 | 7 | 6 | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | S Edberg | 6 | 6 | | | | | | | | | |
| | P Lundgren | 7$^7$ | 6 | | | P Lundgren | 3 | 4 | | | | | | | | | |
| | G Muller | 6$^4$ | 3 | | | | | | | 1 | S Edberg | 6 | 6 | | | | |
| WC | G Doyle | 2 | 1 | | | | | | | | M Woodforde | 4 | 2 | | | | |
| | M Woodforde | 6 | 6 | | | M Woodforde | 6 | 4 | 7$^7$ | | | | | | | | |
| | | | | | 15 | W Masur | 2 | 6 | 6$^4$ | | | | | | | | |
| | | | | | | | | | | | | | | 1 | S Edberg | 6 | 7 |
| | | | | | | | | | | | | | | 8 | M Chang | 4 | 5 |
| | | | | | 10 | A Chesnokov | 1 | 4 | | | | | | | | | |
| | P Canè | 5 | 6 | 1 | | G Pozzi | 6 | 6 | | | | | | | | | |
| | G Pozzi | 7 | 1 | 6 | | | | | | | G Pozzi | 1 | 2 | | | | |
| | T Högstedt | 6$^2$ | 6$^5$ | | | | | | | 8 | M Chang | 6 | 6 | | | | |
| Q | N Kroon | 7$^7$ | 7$^7$ | | Q | N Kroon | 3 | 4 | | | | | | | | | |
| | | | | | 8 | M Chang | 6 | 6 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | A Agassi | 6 | 6 | | | | | | | | | |
| | J Stoltenberg | 7 | 6 | | | J Stoltenberg | 2 | 2 | | | | | | | | | |
| | S Doseděl | 5 | 3 | | | | | | | 4 | A Agassi | 6 | 6 | | | | |
| | J Tarango | 4 | 6 | 6 | | | | | | 14 | M Washington | 3 | 1 | | | | |
| | R Weiss | 6 | 0 | 3 | | J Tarango | 6$^4$ | 2 | | | | | | | | | |
| | | | | | 14 | M Washington | 7$^7$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 4 | A Agassi | 5 | 6$^3$ |
| | | | | | | | | | | | | | | 6 | G Ivanišević | 7 | 7$^7$ |
| | | | | | 11 | R Reneberg | 4 | 7 | 7$^7$ | | | | | | | | |
| Q | S Stolle | 3 | 6 | 6 | Q | S Stolle | 6 | 5 | 6$^5$ | | | | | | | | |
| | T Anzari | 6 | 4 | 4 | | | | | | 11 | R Reneberg | 3 | 2 | | | | |
| Q | S Youl | 4 | 6 | 6 | | | | | | 6 | G Ivanišević | 6 | 6 | | | | |
| | R Fromberg | 6 | 2 | 3 | Q | S Youl | 4 | 3 | | | | | | | | | |
| | | | | | 6 | G Ivanišević | 6 | 6 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | D Wheaton | 6 | 6 | | | | | | | | | | |
| WC | J Morgan | 1 | 5 | | WC | N Borwick | 2 | 3 | | | | | | | | | | |
| WC | N Borwick | 6 | 7 | | | | | | | 5 | D Wheaton | 7 | 6 | | | | | |
| | G Connell | 6$^5$ | 6 | 7$^7$ | | | | | | | G Connell | 5 | 2 | | | | | |
| Q | C Wilkinson | 7$^7$ | 3 | 6$^5$ | | G Connell | 6 | 7$^7$ | | | | | | | | | | |
| | | | | | 12 | A Krickstein | 4 | 6$^4$ | | | | | | | | | | |
| | | | | | | | | | | | | | | 5 | D Wheaton | 3 | 6 | 4 |
| | | | | | | | | | | | | | | 3 | P Sampras | 6 | 4 | 6 |
| | | | | | 13 | T Woodbridge | 6 | 4 | 6 | | | | | | | | | |
| | A Olhovskiy | 5 | 3 | | | J Grabb | 3 | 6 | 2 | | | | | | | | | |
| | J Grabb | 7 | 6 | | | | | | | 13 | T Woodbridge | 2 | 1 | | | | | |
| Q | T Nelson | 3 | 6 | 6 | | | | | | 3 | P Sampras | 6 | 6 | | | | | |
| | S Matsuoka | 6 | 3 | 4 | Q | T Nelson | 6 | 1 | 4 | | | | | | | | | |
| | | | | | 3 | P Sampras | 4 | 6 | 6 | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | D Rostagno | 4 | 4 | | | | | | | | | | |
| | L Herrera | 2 | 1 | | | D Marcelino | 6 | 6 | | | | | | | | | | |
| | D Marcelino | 6 | 6 | | | | | | | | D Marcelino | 1 | 2 | | | | | |
| WC | J Fitzgerald | 6 | 6 | | | | | | | 9 | B Gilbert | 6 | 6 | | | | | |
| | J Anderson | 2 | 3 | | WC | J Fitzgerald | 2 | 2 | | | | | | | | | | |
| | | | | | 9 | B Gilbert | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 9 | B Gilbert | 6 | 6 |
| | | | | | | | | | | | | | | | 16 | W Ferreira | 1 | 4 |
| | | | | | 16 | W Ferreira | 6 | 7 | | | | | | | | | | |
| | D Pate | 0 | 6 | 3 | | D Poliakov | 4 | 5 | | | | | | | | | | |
| | D Poliakov | 6 | 3 | 6 | | | | | | 16 | W Ferreira | 6 | 2 | 7 | | | | |
| Q | D Orsanic | 1 | 0 | | | | | | | 2 | I Lendl | 4 | 6 | 5 | | | | |
| | S Davis | 6 | 6 | | | S Davis | 4 | 7$^7$ | 5 | | | | | | | | | |
| | | | | | 2 | I Lendl | 6 | 6$^5$ | 7 | | | | | | | | | |