# 1991 Mercedes Cup – Doubles

Pieter Aldrich and Danie Visser were the defending champions, but Aldrich did not compete this year. Visser teamed up with Gary Muller and lost in the quarterfinals to Nick Brown and Richard Vogel.
Wally Masur and Emilio Sánchez won the title by defeating Omar Camporese and Goran Ivanišević 4–6, 6–3, 6–4 in the final.

## Seeds

All seeds received a bye to the second round.
* Gary Muller / Danie Visser (quarterfinals)
* Luke Jensen / Laurie Warder (quarterfinals)
* Neil Broad / Piet Norval (quarterfinals)
* Udo Riglewski / Michael Stich (quarterfinals)
* Paul Haarhuis / Mark Koevermans (semifinals)
* Omar Camporese / Goran Ivanišević (final)
* Wally Masur / Emilio Sánchez (champions)
* Kevin Curren / Stefan Kruger (second 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 |
| | Nick Brown Richard Vogel | 2 | 6 | | | | | |
| 6 | Omar Camporese Goran Ivanišević | 6 | 7 | | | | | |
| 6 | Omar Camporese Goran Ivanišević | 6 | 7 | 6 | Omar Camporese Goran Ivanišević | 6 | 3 | 4 |
| | | | | 7 | Wally Masur Emilio Sánchez | 4 | 6 | 6 |
| 5 | Paul Haarhuis Mark Koevermans | 5 | 3 | 7 | Wally Masur Emilio Sánchez | 4 | 6 | 6 |
| 7 | Wally Masur Emilio Sánchez | 7 | 6 | | | | | |

### Top half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | 1 | G Muller D Visser | 7 | 6 | | | | | | | | | |
| K Nováček D Vacek | 6 | 6 | 6 | | A Mora R Smith | 6 | 4 | | | | | | | | | |
| A Mora R Smith | 4 | 7 | 7 | | | | | 1 | G Muller D Visser | 7 | 6 | 5 | | | | |
| N Brown R Vogel | 6 | 3 | 6 | | | | | | N Brown R Vogel | 6 | 7 | 7 | | | | |
| F Clavet H de la Peña | 3 | 6 | 3 | | N Brown R Vogel | 6 | 6 | | | | | | | | | |
| | | | | 8 | K Curren S Kruger | 4 | 3 | | | | | | | | | |
| | | | | | | | | | | | | | | N Brown R Vogel | 2 | 6 |
| | | | | | | | | | | | | | 6 | O Camporese G Ivanišević | 6 | 7 |
| | | | | 3 | N Broad P Norval | 6 | 7 | | | | | | | | | |
| R Båthman R Bergh | 4 | 5 | | | J Sánchez É Winogradsky | 1 | 6 | | | | | | | | | |
| J Sánchez É Winogradsky | 6 | 7 | | | | | | 3 | N Broad P Norval | 5 | 4 | | | | | |
| M Bahrami R Gilbert | 4 | 4 | | | | | | 6 | O Camporese G Ivanišević | 7 | 6 | | | | | |
| A Gómez D Pérez | 6 | 6 | | | A Gómez D Pérez | 4 | 3 | | | | | | | | | |
| | | | | 6 | O Camporese G Ivanišević | 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 | P Haarhuis M Koevermans | 6 | 6 | | | | | | | | | | |
| WC | E Jelen CU Steeb | 6 | 7 | 1 | Q | Ģ Dzelde D Poliakov | 2 | 4 | | | | | | | | | | |
| Q | Ģ Dzelde D Poliakov | 7 | 6 | 6 | | | | | | 5 | P Haarhuis M Koevermans | 6 | 6 | 6 | | | | |
| | R Krajicek J Siemerink | 6 | 6 | | | | | | | 4 | U Riglewski M Stich | 7 | 4 | 3 | | | | |
| | T Nijssen C Suk | 2 | 3 | | | R Krajicek J Siemerink | 4 | 4 | | | | | | | | | | |
| | | | | | 4 | U Riglewski M Stich | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 5 | P Haarhuis M Koevermans | 5 | 3 |
| | | | | | | | | | | | | | | | 7 | W Masur E Sánchez | 7 | 6 |
| | | | | | 7 | W Masur E Sánchez | 2 | 6 | 6 | | | | | | | | | |
| | G Luza C Motta | 6 | 2 | | | HJ Davids L Pimek | 6 | 3 | 4 | | | | | | | | | |
| | HJ Davids L Pimek | 7 | 6 | | | | | | | 7 | W Masur E Sánchez | 6 | 6 | | | | | |
| | S Cannon L Jönsson | 6 | 3 | | | | | | | 2 | L Jensen L Warder | 3 | 2 | | | | | |
| | V Flégl G Prpić | 7 | 6 | | | V Flégl G Prpić | 7 | 4 | 4 | | | | | | | | | |
| | | | | | 2 | L Jensen L Warder | 6 | 6 | 6 | | | | | | | | | |