# 1991 Monte Carlo Open – Singles

Sergi Bruguera defeated Boris Becker in the final, 5–7, 6–4, 7–6$^{(8–6)}$, 7–6$^{(7–4)}$ to win the singles tennis title at the 1991 Monte Carlo Open.
Andrei Chesnokov was the defending champion, but lost to Boris Becker in the quarterfinals.

## Seeds

The top eight seeds received a bye to the second round.
* Stefan Edberg (second round)
* Boris Becker (final)
* Guy Forget (third round)
* Andre Agassi (second round)
* Goran Ivanišević (third round)
* Jonas Svensson (quarterfinals)
* Emilio Sánchez (second round)
* Andrei Chesnokov (quarterfinals)
* Sergi Bruguera (champion)
* Andrei Cherkasov (third round)
* Thomas Muster (first round)
* Andrés Gómez (first round)
* Marc Rosset (first round)
* Karel Nováček (first round)
* Guillermo Pérez Roldán (second round)
* Alexander Volkov (third 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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final | Final | Final | |
| | Magnus Gustafsson | 5 | 5 | | | | | | | | | | | | |
| 9 | Sergi Bruguera | 7 | 7 | | | | | | | | | | | | |
| 9 | Sergi Bruguera | 7 | 7 | 9 | Sergi Bruguera | 6 | 6 | | | | | | | | |
| | | | | | Horst Skoff | 1 | 4 | | | | | | | | |
| | Horst Skoff | 6 | 6 | | Horst Skoff | 1 | 4 | | | | | | | | |
| 6 | Jonas Svensson | 3 | 3 | | | | | | | | | | | | |
| 6 | Jonas Svensson | 3 | 3 | | | | | 9 | Sergi Bruguera | 5 | 6 | 7$^8$ | 7$^7$ | | |
| | | | | | | | | 2 | Boris Becker | 7 | 4 | 6$^6$ | 6$^4$ | | |
| WC | Carl-Uwe Steeb | 4 | 2 | | | | | | | | | | | 2 | Boris Becker | 7 | 4 | 6$^6$ | 6$^4$ |
| | Goran Prpić | 6 | 6 | | | | | | | | | | | | |
| | Goran Prpić | 6 | 6 | | Goran Prpić | 3 | 3 | | | | | | | | |
| | | | | 2 | Boris Becker | 6 | 6 | | | | | | | | |
| 8 | Andrei Chesnokov | 1 | 3 | 2 | Boris Becker | 6 | 6 | | | | | | | | |
| 2 | Boris Becker | 6 | 6 | | | | | | | | | | | | |

### 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | S Edberg | 7 | 3 | 6$^3$ | | | | | | | | |
| | M Larsson | 6 | 6 | | | M Larsson | 5 | 6 | 7$^7$ | | | | | | | | |
| Q | D Rikl | 3 | 1 | | | | | | | | M Larsson | 6$^2$ | 4 | | | | |
| | M Gustafsson | 4 | 6 | 6 | | | | | | | M Gustafsson | 7$^7$ | 6 | | | | |
| Q | U Riglewski | 6 | 2 | 4 | | M Gustafsson | 6 | 6 | | | | | | | | | |
| Q | T Tulasne | 0 | 4 | | 15 | G Pérez Roldán | 4 | 3 | | | | | | | | | |
| 15 | G Pérez Roldán | 6 | 6 | | | | | | | | | | | | M Gustafsson | 5 | 5 |
| 9 | S Bruguera | 6 | 6$^5$ | 6 | | | | | | | | | | 9 | S Bruguera | 7 | 7 |
| | R Furlan | 3 | 7$^7$ | 3 | 9 | S Bruguera | 6 | 7 | | | | | | | | | |
| | H Leconte | 5 | 6 | 1 | | C Caratti | 1 | 5 | | | | | | | | | |
| | C Caratti | 7 | 2 | 6 | | | | | | 9 | S Bruguera | 6 | 6 | | | | |
| | J Arias | 2 | 6$^6$ | | | | | | | WC | A Mancini | 1 | 4 | | | | |
| WC | A Mancini | 6 | 7$^8$ | | WC | A Mancini | 6 | 6 | | | | | | | | | |
| | | | | | 7 | E Sánchez | 3 | 3 | | | | | | | | | |

#### Section 2

| 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | A Agassi | 0 | 7$^7$ | 3 | | | | | | | | | |
| | JP Fleurian | 6 | 4 | 2 | | H Skoff | 6 | 6$^3$ | 6 | | | | | | | | | |
| | H Skoff | 4 | 6 | 6 | | | | | | | H Skoff | 6 | 7 | | | | | |
| | P Lundgren | 1 | 4 | | | | | | | Q | C Pistolesi | 2 | 5 | | | | | |
| | J Aguilera | 6 | 6 | | | J Aguilera | 3 | 6 | 5 | | | | | | | | | |
| Q | C Pistolesi | 7$^9$ | 5 | 6 | Q | C Pistolesi | 6 | 1 | 7 | | | | | | | | | |
| 13 | M Rosset | 6$^7$ | 7 | 3 | | | | | | | | | | | | H Skoff | 6 | 6 |
| 11 | T Muster | 7$^9$ | 2 | 1 | | | | | | | | | | | 6 | J Svensson | 3 | 3 |
| Q | V Paloheimo | 6$^7$ | 6 | 6 | Q | V Paloheimo | 7 | 6 | | | | | | | | | | |
| | M Koevermans | 6 | 6 | | | M Koevermans | 5 | 4 | | | | | | | | | | |
| | L Mattar | 3 | 2 | | | | | | | Q | V Paloheimo | 1 | 6 | 3 | | | | |
| | F Davín | 4 | 0$^r$ | | | | | | | 6 | J Svensson | 6 | 4 | 6 | | | | |
| Q | D Pescariu | 6 | 1 | | Q | D Pescariu | 3 | 6 | 4 | | | | | | | | | |
| | | | | | 6 | J Svensson | 6 | 4 | 6 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | G Ivanišević | 7$^7$ | 7$^7$ | | | | | | | | | |
| | J Arrese | 6 | 6 | | | J Arrese | 6$^4$ | 6$^5$ | | | | | | | | | |
| WC | B Borg | 2 | 3 | | | | | | 5 | G Ivanišević | 6 | 0 | 2 | | | | |
| WC | T Champion | 6 | 4 | 3 | | | | | WC | C-U Steeb | 2 | 6 | 6 | | | | |
| WC | C-U Steeb | 2 | 6 | 6 | WC | C-U Steeb | 6 | 6 | | | | | | | | | |
| | O Camporese | 6 | 3 | 6 | | O Camporese | 4 | 3 | | | | | | | | | |
| 12 | A Gómez | 3 | 6 | 1 | | | | | | | | | | WC | C-U Steeb | 4 | 2 |
| 14 | K Nováček | 2 | 4 | | | | | | | | | | | | G Prpić | 6 | 6 |
| | G Prpić | 6 | 6 | | | G Prpić | 6 | 6 | | | | | | | | | |
| | M Jaite | 3 | 2 | | | R Fromberg | 1 | 4 | | | | | | | | | |
| | R Fromberg | 6 | 6 | | | | | | | G Prpić | 6 | 6 | | | | | |
| | C Bergström | 0 | 2 | | | | | | 3 | G Forget | 2 | 0 | | | | | |
| | P Haarhuis | 6 | 6 | | | P Haarhuis | 5 | 4 | | | | | | | | | |
| | | | | | 3 | G Forget | 7 | 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | A Chesnokov | 7$^7$ | 6 | | | | | | | | | | |
| | M Wilander | 6 | 6 | | | M Wilander | 6$^3$ | 2 | | | | | | | | | | |
| WC | M Woodforde | 0 | 3 | | | | | | | 8 | A Chesnokov | 6 | 6 | | | | | |
| | N Kulti | 6 | 6$^3$ | 6$^2$ | | | | | | 10 | A Cherkasov | 1 | 0 | | | | | |
| | R Agénor | 2 | 7$^7$ | 7$^7$ | | R Agénor | 6$^4$ | 3 | | | | | | | | | | |
| | E Jelen | 0 | 2 | | 10 | A Cherkasov | 7$^7$ | 6 | | | | | | | | | | |
| 10 | A Cherkasov | 6 | 6 | | | | | | | | | | | | 8 | A Chesnokov | 1 | 3 |
| 16 | A Volkov | 5 | 6 | 7 | | | | | | | | | | | 2 | B Becker | 6 | 6 |
| | H de la Peña | 7 | 3 | 5 | 16 | A Volkov | 2 | 6 | 6 | | | | | | | | | |
| Q | T Guardiola | 3 | 1 | | | F Santoro | 6 | 1 | 4 | | | | | | | | | |
| | F Santoro | 6 | 6 | | | | | | | 16 | A Volkov | 6 | 1 | 1 | | | | |
| | M Filippini | 1 | 1 | | | | | | | 2 | B Becker | 3 | 6 | 6 | | | | |
| | J Sánchez | 6 | 6 | | | J Sánchez | 7$^7$ | 3 | 3 | | | | | | | | | |
| | | | | | 2 | B Becker | 6$^3$ | 6 | 6 | | | | | | | | | |