# 1991 Salem Open – Singles

Pat Cash was the defending champion, but did not compete this year.
Richard Krajicek won the title by defeating Wally Masur 6–2, 3–6, 6–3 in the final.

## Seeds

* Michael Chang (quarterfinals)
* John McEnroe (firstround)
* Michael Stich (first round)
* Jakob Hlasek (first round)
* Aaron Krickstein (first round)
* Anders Järryd (second round, retired)
* Amos Mansdorf (second round)
* Todd Woodbridge (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 |
| Gary Muller | 2 | 4 | | | | | |
| Richard Krajicek | 6 | 6 | | | | | |
| Richard Krajicek | 6 | 6 | | Richard Krajicek | 6 | 3 | 6 |
| | | | | Wally Masur | 2 | 6 | 3 |
| Wally Masur | 4 | 7$^7$ | 6 | Wally Masur | 2 | 6 | 3 |
| Alex Antonitsch | 6 | 6$^2$ | 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 |
| 1 | M Chang | 6 | 6 | | | | | | | | | | | | | | |
| | K Jones | 2 | 3 | | 1 | M Chang | 7 | 6$^5$ | 6 | | | | | | | | |
| | C van Rensburg | 6 | 5 | 7 | | C van Rensburg | 5 | 7$^7$ | 4 | | | | | | | | |
| | R Krishnan | 2 | 7 | 5 | | | | | | 1 | M Chang | 7 | 3 | 6$^1$ | | | |
| | G Muller | 6 | 6 | | | | | | | | G Muller | 5 | 6 | 7$^7$ | | | |
| | J Yzaga | 3 | 4 | | | G Muller | 6 | 1 | 6 | | | | | | | | |
| WC | T Ho | 6 | 6 | | WC | T Ho | 1 | 6 | 3 | | | | | | | | |
| 8 | T Woodbridge | 4 | 2 | | | | | | | | | | | | G Muller | 2 | 4 |
| 3 | M Stich | 5 | 4 | | | | | | | | | | | | R Krajicek | 6 | 6 |
| | E Masso | 7 | 6 | | | E Masso | 1 | 3 | | | | | | | | | |
| | R Krajicek | 6 | 6$^8$ | 6 | | R Krajicek | 6 | 6 | | | | | | | | | |
| LL | N Borwick | 4 | 7$^{10}$ | 3 | | | | | | | R Krajicek | 7$^8$ | 2 | 6 | | | |
| | P Kühnen | 6 | 6 | | | | | | | | P Kühnen | 6$^6$ | 6 | 1 | | | |
| Q | J Stimpson | 4 | 4 | | | P Kühnen | 7$^7$ | 1 | | | | | | | | | |
| | U Riglewski | 2 | 1 | | 6 | A Järryd | 6$^5$ | 0$^r$ | | | | | | | | | |
| 6 | A Järryd | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | A Krickstein | 6$^4$ | 1 | | | | | | | | | | | | | | | |
| | K Curren | 7$^7$ | 6 | | | K Curren | 6 | 1 | 5 | | | | | | | | | |
| WC | F Barrientos | 6 | 6 | | WC | F Barrientos | 1 | 6 | 7 | | | | | | | | | |
| Q | N Brown | 1 | 4 | | | | | | | WC | F Barrientos | 0 | 1 | | | | | |
| Q | G Michibata | 1 | 7$^7$ | 6 | | | | | | | W Masur | 6 | 6 | | | | | |
| | M Kratzmann | 6 | 6$^5$ | 2 | Q | G Michibata | 3 | 2 | | | | | | | | | | |
| | W Masur | 6 | 7$^8$ | | | W Masur | 6 | 6 | | | | | | | | | | |
| 4 | J Hlasek | 4 | 6$^6$ | | | | | | | | | | | | W Masur | 4 | 7$^7$ | 6 |
| 7 | A Mansdorf | 6 | 6$^3$ | 6 | | | | | | | | | | | A Antonitsch | 6 | 6$^2$ | 3 |
| Q | G Pozzi | 3 | 7$^7$ | 4 | 7 | A Mansdorf | 7$^7$ | 4 | 2 | | | | | | | | | |
| | A Mronz | 6 | 6 | | | A Mronz | 6$^4$ | 6 | 6 | | | | | | | | | |
| WC | M Walker | 3 | 3 | | | | | | | | A Mronz | 6 | 3 | 4 | | | | |
| | G Raoux | 4 | 6 | 5 | | | | | | | A Antonitsch | 3 | 6 | 6 | | | | |
| | A Antonitsch | 6 | 4 | 7 | | A Antonitsch | 6 | 7$^7$ | | | | | | | | | | |
| | T Witsken | 6 | 5 | 7$^7$ | | T Witsken | 1 | 6$^3$ | | | | | | | | | | |
| 2 | J McEnroe | 3 | 7 | 6$^3$ | | | | | | | | | | | | | | |