# 1991 Swedish Open – Singles

Richard Fromberg was the defending champion, but did not compete this year.
Magnus Gustafsson won the title by defeating Alberto Mancini 6–1, 6–2 in the final.

## Seeds

* Andrei Cherkasov (first round)
* Magnus Gustafsson (champion)
* Alexander Volkov (semifinals)
* Anders Järryd (first round)
* Marcelo Filippini (second round)
* Nicklas Kulti (second round)
* Mark Koevermans (first round)
* Alberto Mancini (final)

## 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 |
| 8 | Alberto Mancini | 0 | 6 | 6 | | | | |
| 3 | Alexander Volkov | 6 | 3 | 2 | | | | |
| 3 | Alexander Volkov | 6 | 3 | 2 | 8 | Alberto Mancini | 1 | 2 |
| | | | | | 2 | Magnus Gustafsson | 6 | 6 |
| | Christian Bergström | 6 | 3 | 2 | 2 | Magnus Gustafsson | 6 | 6 |
| 2 | Magnus Gustafsson | 4 | 6 | 6 | | | | |

### 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 | Semifinals |
| 1 | A Cherkasov | 3 | 2 | | | | | | | | | | | | | | | | |
| | M Larsson | 6 | 6 | | | M Larsson | 6 | 6 | | | | | | | | | | | |
| Q | M Górriz | 3 | 6 | 3 | Q | L-A Wahlgren | 0 | 3 | | | | | | | | | | | |
| Q | L-A Wahlgren | 6 | 3 | 6 | | | | | | | M Larsson | 6 | 3 | 4 | | | | | |
| | C Pistolesi | 6 | 6 | | | | | | | 8 | A Mancini | 4 | 6 | 6 | | | | | |
| | T Champion | 4 | 0 | | | C Pistolesi | 6 | 3 | 2 | | | | | | | | | | |
| Q | J Björkman | 3 | 1 | | 8 | A Mancini | 3 | 6 | 6 | | | | | | | | | | |
| 8 | A Mancini | 6 | 6 | | | | | | | | | | | | 8 | A Mancini | 0 | 6 | 6 |
| 3 | A Volkov | 6 | 6 | | | | | | | | | | | | 3 | A Volkov | 6 | 3 | 2 |
| | V Paloheimo | 4 | 4 | | 3 | A Volkov | 6 | 4 | 6 | | | | | | | | | | |
| | M Pernfors | 6 | 6 | | | M Pernfors | 4 | 6 | 4 | | | | | | | | | | |
| | J Aguilera | 3 | 3 | | | | | | | 3 | A Volkov | 6 | 6 | | | | | | |
| | L Jonsson | 6 | 6 | | | | | | | | L Jonsson | 2 | 1 | | | | | | |
| | T Carbonell | 3 | 4 | | | L Jonsson | 6 | 6 | | | | | | | | | | | |
| | B Wuyts | 0$^r$ | | | 5 | M Filippini | 1 | 2 | | | | | | | | | | | |
| 5 | M Filippini | 2 | | | | | | | | | | | | | | | | | |

### 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 |
| 6 | N Kulti | 4 | 6 | 6 | | | | | | | | | | | | | | | |
| Q | J Anderson | 6 | 2 | 3 | 6 | N Kulti | 2 | 1 | | | | | | | | | | | |
| | C Bergström | 6 | 6 | | | C Bergström | 6 | 6 | | | | | | | | | | | |
| | A Rahunen | 1 | 2 | | | | | | | | C Bergström | 3 | 6 | 6 | | | | | |
| WC | T Enqvist | 4 | 1 | | | | | | | | J Gunnarsson | 6 | 2 | 2 | | | | | |
| | J Gunnarsson | 6 | 6 | | | J Gunnarsson | 7 | 7 | | | | | | | | | | | |
| | E Masso | 6 | 6 | | | E Masso | 5 | 6 | | | | | | | | | | | |
| 4 | A Järryd | 3 | 1 | | | | | | | | | | | | | C Bergström | 6 | 3 | 2 |
| 7 | M Koevermans | 6 | 1 | 5 | | | | | | | | | | | 2 | M Gustafsson | 4 | 6 | 6 |
| | P Arraya | 3 | 6 | 7 | | P Arraya | 7 | 4 | 6 | | | | | | | | | | |
| WC | D Engel | 1 | 7 | 6 | WC | D Engel | 6 | 6 | 4 | | | | | | | | | | |
| | C Pioline | 6 | 5 | 4 | | | | | | | P Arraya | 1 | 2 | | | | | | |
| WC | N Kroon | 7 | 4 | 6 | | | | | | 2 | M Gustafsson | 6 | 6 | | | | | | |
| | P Kühnen | 5 | 6 | 4 | WC | N Kroon | 4 | 7 | 1 | | | | | | | | | | |
| | N Marques | 0 | 5 | | 2 | M Gustafsson | 6 | 6 | 6 | | | | | | | | | | |
| 2 | M Gustafsson | 6 | 7 | | | | | | | | | | | | | | | | |