# 1991 ATP German Open – Singles

Karel Nováček defeated Magnus Gustafsson in the final, 6–3, 6–3, 5–7, 0–6, 6–1 to win the singles tennis title at the 1991 Hamburg European Open.
Juan Aguilera was the defending champion, but lost in the first round to Jordi Arrese.

## Seeds

* Stefan Edberg (Quarterfinal)
* Ivan Lendl (second round)
* Pete Sampras (third round)
* Goran Ivanišević (Quarterfinal, retired)
* Sergi Bruguera (third round)
* Jim Courier (second round)
* Jonas Svensson (second round)
* Emilio Sánchez (second round)
* Michael Stich (semifinal)
* Andrei Cherkasov (second round)
* Andrés Gómez (first round)
* Andrei Chesnokov (first round)
* Karel Nováček (champion)
* Alexander Volkov (third round)
* Guillermo Pérez Roldán (withdrew)
* Marc Rosset (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

| Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal | Semifinal | Semifinal | Semifinal | Semifinal | Semifinal | Final | Final | Final | Final | Final | Final | Final | |
| 1 | Stefan Edberg | 2 | 6$^4$ | | | | | | | | | | | | | | |
| 9 | Michael Stich | 6 | 7 | | | | | | | | | | | | | | |
| 9 | Michael Stich | 6 | 7 | | 9 | Michael Stich | 3 | 6 | 6$^5$ | | | | | | | | |
| | | | | | 13 | Karel Nováček | 6 | 2 | 7 | | | | | | | | |
| 13 | Karel Nováček | 4 | 6 | 6 | 13 | Karel Nováček | 6 | 2 | 7 | | | | | | | | |
| | Mark Koevermans | 6 | 4 | 2 | | | | | | | | | | | | | |
| | Mark Koevermans | 6 | 4 | 2 | | | | | | 13 | Karel Nováček | 6 | 6 | 5 | 0 | 6 | |
| | | | | | | | | | | | Magnus Gustafsson | 3 | 3 | 7 | 6 | 1 | |
| | Goran Prpić | 7 | 3 | | | | | | | | | | | | | | Magnus Gustafsson | 3 | 3 | 7 | 6 | 1 |
| 4 | Goran Ivanišević | 5 | 0$^r$ | | | | | | | | | | | | | | |
| 4 | Goran Ivanišević | 5 | 0$^r$ | | | Goran Prpić | 2 | 6 | 6$^4$ | | | | | | | | |
| | | | | | | Magnus Gustafsson | 6 | 1 | 7 | | | | | | | | |
| | Magnus Gustafsson | 6 | 6 | | | Magnus Gustafsson | 6 | 1 | 7 | | | | | | | | |
| WC | Yannick Noah | 1 | 4 | | | | | | | | | | | | | | |

### 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 | Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal |
| | | | | | 1 | S Edberg | 6 | 6 | | | | | | | | | |
| WC | A Mronz | 6 | 7 | | WC | A Mronz | 3 | 1 | | | | | | | | | |
| WC | P Kühnen | 2 | 5 | | | | | | | 1 | S Edberg | 6 | 6 | | | | |
| | N Kulti | 4 | 6$^4$ | | | | | | | | R Agénor | 2 | 1 | | | | |
| | R Agénor | 6 | 7 | | | R Agénor | 7 | 0 | 6 | | | | | | | | |
| | A Krickstein | 4 | 6 | 6 | | A Krickstein | 5 | 6 | 2 | | | | | | | | |
| 16 | M Rosset | 6 | 2 | 3 | | | | | | | | | | 1 | S Edberg | 2 | 6$^4$ |
| 9 | M Stich | 1 | 6 | 7 | | | | | | | | | | 9 | M Stich | 6 | 7 |
| | T Carbonell | 6 | 3 | 5 | 9 | M Stich | 7 | 6 | | | | | | | | | |
| Q | T Nijssen | 6 | 4 | 6$^4$ | | P Haarhuis | 5 | 0 | | | | | | | | | |
| | P Haarhuis | 3 | 6 | 7 | | | | | | 9 | M Stich | 6 | 6 | | | | |
| Q | F Clavet | 7 | 6 | | | | | | | | F Clavet | 1 | 4 | | | | |
| | A Mansdorf | 6$^4$ | 2 | | Q | F Clavet | 6 | 4 | 6 | | | | | | | | |
| | | | | | 8 | E Sánchez | 3 | 6 | 4 | | | | | | | | |

#### Section 2

| 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 | Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal |
| | | | | 3 | P Sampras | 6 | 4 | 6 | | | | | | | | | |
| | H Skoff | 7 | 6 | | H Skoff | 3 | 6 | 4 | | | | | | | | | |
| | T Muster | 5 | 2 | | | | | | 9 | P Sampras | 4 | 2 | | | | | |
| | O Camporese | 7 | 6 | | | | | | 13 | K Nováček | 6 | 6 | | | | | |
| Q | R Haas | 6$^4$ | 4 | | O Camporese | 3 | 2 | | | | | | | | | | |
| WC | C-U Steeb | 4 | 6$^4$ | 13 | K Nováček | 6 | 6 | | | | | | | | | | |
| 13 | K Nováček | 6 | 7 | | | | | | | | | | 13 | K Nováček | 4 | 6 | 6 |
| 11 | Gómez | 4 | 3 | | | | | | | | | | | M Koevermans | 6 | 4 | 2 |
| | F Davín | 6 | 6 | | F Davín | 4 | 4 | | | | | | | | | | |
| | M Koevermans | 6 | 6 | | M Koevermans | 6 | 6 | | | | | | | | | | |
| | M Vajda | 3 | 2 | | | | | | | M Koevermans | 6 | 6 | | | | | |
| | M Jaite | 5 | 3 | | | | | | 5 | S Bruguera | 4 | 3 | | | | | |
| | E Jelen | 7 | 6 | | E Jelen | 3 | 1 | | | | | | | | | | |
| | | | | 5 | S Bruguera | 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 | Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal |
| | | | | | 6 | J Courier | 7 | 2 | 4 | | | | | | | | |
| | H de la Peña | 6 | 3 | 6 | | H de la Peña | 6$^3$ | 6 | 6 | | | | | | | | |
| | C Bergström | 2 | 6 | 2 | | | | | | | H de la Peña | 3 | 4 | | | | |
| | J Aguilera | 2 | 5 | | | | | | | | G Prpić | 6 | 6 | | | | |
| | J Arrese | 6 | 7 | | | J Arrese | 3 | 3 | | | | | | | | | |
| | G Prpić | 6 | 6 | | | G Prpić | 6 | 6 | | | | | | | | | |
| 12 | A Chesnokov | 4 | 3 | | | | | | | | | | | | G Prpić | 7 | 3 |
| 14 | A Volkov | 6 | 7 | | | | | | | | | | | 4 | G Ivanišević | 5 | 0$^r$ |
| | G Bloom | 1 | 6$^{12}$ | | 14 | A Volkov | 7 | 7 | | | | | | | | | |
| | A Järryd | 4 | 1 | | Q | A Boetsch | 6$^4$ | 6$^1$ | | | | | | | | | |
| Q | A Boetsch | 6 | 6 | | | | | | | 14 | A Volkov | 1 | 3 | | | | |
| WC | U Riglewski | 1 | 4 | | | | | | | 4 | G Ivanišević | 6 | 6 | | | | |
| | L Mattar | 6 | 6 | | | L Mattar | 1 | 1 | | | | | | | | | |
| | | | | | 4 | G Ivanišević | 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 | Quarterfinal | Quarterfinal | Quarterfinal | Quarterfinal |
| | | | | | 7 | J Svensson | 2 | 2 | | | | | | | | | | |
| Q | C Pistolesi | 3 | 3 | | | C Caratti | 6 | 6 | | | | | | | | | | |
| | C Caratti | 6 | 6 | | | | | | | | C Caratti | 5 | 6 | 2 | | | | |
| | M Gustafsson | 6 | 6 | | | | | | | | M Gustafsson | 7 | 3 | 6 | | | | |
| | D Engel | 4 | 2 | | | M Gustafsson | 3 | 6 | 6 | | | | | | | | | |
| | H Leconte | 6$^3$ | 3 | | 10 | A Cherkasov | 6 | 4 | 4 | | | | | | | | | |
| 10 | A Cherkasov | 7 | 6 | | | | | | | | | | | | | M Gustafsson | 6 | 6 |
| LL | W Ferreira | 2 | 6 | 3 | | | | | | | | | | | WC | Y Noah | 1 | 4 |
| | M Larsson | 6 | 3 | 6 | | M Larsson | 4 | 6 | 3 | | | | | | | | | |
| WC | Y Noah | 7 | 6 | | WC | Y Noah | 6 | 1 | 6 | | | | | | | | | |
| | R Fromberg | 6$^6$ | 0 | | | | | | | WC | Y Noah | 1 | 6 | 6 | | | | |
| | M Filippini | 3 | 3 | | | | | | | Q | R Furlan | 6 | 4 | 3 | | | | |
| Q | R Furlan | 6 | 6 | | Q | R Furlan | 7 | 6 | | | | | | | | | | |
| | | | | | 2 | I Lendl | 5 | 4 | | | | | | | | | | |