# 1991 BMW Open – Singles

The 1991 BMW Open Singles was the singles bracket of the 1991 BMW Open. The title was won by Magnus Gustafsson, defeating Guillermo Pérez Roldán. Roldán retired while Gustafsson was leading 3–6, 6–3, 4–3. Karel Nováček, the defending champion from the prior year singles event, did not participate.

## Seeds

* Ivan Lendl (semifinals)
* Goran Ivanišević (semifinals)
* Jonas Svensson (first round)
* John McEnroe (first round)
* Thomas Muster (first round)
* Michael Stich (first round)
* Guillermo Pérez Roldán (final)
* Alexander Volkov (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 | Final |
| 1 | Ivan Lendl | 4 | 5 | | | | | |
| | Magnus Gustafsson | 6 | 7 | | | | | |
| | Magnus Gustafsson | 6 | 7 | | Magnus Gustafsson | 3 | 6 | 4 |
| | | | | 7 | Guillermo Pérez Roldán | 6 | 3 | 3$^r$ |
| | Christian Bergström | 0 | 0 | 7 | Guillermo Pérez Roldán | 6 | 3 | 3$^r$ |
| 7 | Guillermo Pérez Roldán | 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 |
| 1 | I Lendl | 6 | 6 | | | | | | | | | | | | | | | |
| | A Mronz | 2 | 2 | | 1 | I Lendl | 3 | 6 | 6 | | | | | | | | | |
| | M Woodforde | 3 | 2 | | | G Prpić | 6 | 4 | 2 | | | | | | | | | |
| | G Prpić | 6 | 6 | | | | | | | 1 | I Lendl | 3 | 6 | 7 | | | | |
| LL | E Bengoechea | 4 | 7 | 6 | | | | | | | T Witsken | 6 | 4 | 5 | | | | |
| | H de la Peña | 6 | 5 | 1 | LL | E Bengoechea | 4 | 6 | 4 | | | | | | | | | |
| | T Witsken | 1 | 7 | 6 | | T Witsken | 6 | 3 | 6 | | | | | | | | | |
| 8 | A Volkov | 6 | 5 | 1 | | | | | | | | | | | 1 | I Lendl | 4 | 5 |
| 3 | J Svensson | 4 | 1 | | | | | | | | | | | | | M Gustafsson | 6 | 7 |
| | A Järryd | 6 | 6 | | | A Järryd | 6 | 4 | 6$^3$ | | | | | | | | | |
| WC | A Mancini | 4 | 3 | | WC | U Riglewski | 4 | 6 | 7$^7$ | | | | | | | | | |
| WC | U Riglewski | 6 | 6 | | | | | | | | U Riglewski | 2 | 5 | | | | | |
| | A Mansdorf | 4 | 2 | | | | | | | | M Gustafsson | 6 | 7 | | | | | |
| | H Skoff | 6 | 6 | | | H Skoff | 0 | 6 | 4 | | | | | | | | | |
| | M Gustafsson | 5 | 6 | 6 | | M Gustafsson | 6 | 4 | 6 | | | | | | | | | |
| 6 | M Stich | 7 | 4 | 3 | | | | | | | | | | | | | | |

### 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 | T Muster | 1 | 6 | 3 | | | | | | | | | | | | | | |
| | C Bergström | 6 | 2 | 6 | | C Bergström | 6 | 6 | | | | | | | | | | |
| | M Vajda | 7$^7$ | 6 | | | M Vajda | 2 | 4 | | | | | | | | | | |
| | C-U Steeb | 6$^3$ | 2 | | | | | | | | C Bergström | 4 | 6 | 6 | | | | |
| Q | A Medvedev | 3 | 5 | | | | | | | | L Jönsson | 6 | 2 | 0 | | | | |
| | L Jönsson | 6 | 7 | | | L Jönsson | 6 | 6 | | | | | | | | | | |
| Q | D Pescariu | 6 | 6 | | Q | D Pescariu | 0 | 4 | | | | | | | | | | |
| 4 | J McEnroe | 2 | 2 | | | | | | | | | | | | | C Bergström | 0 | 0 |
| 7 | G Pérez Roldán | 6 | 6 | | | | | | | | | | | | 7 | G Pérez Roldán | 6 | 6 |
| | J Aguilera | 3 | 0 | | 7 | G Pérez Roldán | 7 | 6 | | | | | | | | | | |
| Q | D Engel | 6 | 6 | | Q | D Engel | 5 | 2 | | | | | | | | | | |
| Q | P Vojtíšek | 3 | 3 | | | | | | | 7 | G Pérez Roldán | 7$^7$ | 6 | | | | | |
| | E Jelen | 3 | 6 | 6 | | | | | | 2 | G Ivanišević | 6$^5$ | 1 | | | | | |
| | R Agénor | 6 | 4 | 0 | | E Jelen | 4 | 6 | 3 | | | | | | | | | |
| WC | J Wöhrmann | 6$^2$ | 1 | | 2 | G Ivanišević | 6 | 4 | 6 | | | | | | | | | |
| 2 | G Ivanišević | 7$^7$ | 6 | | | | | | | | | | | | | | | |