# 1990 Monte Carlo Open – Singles

Andrei Chesnokov defeated Thomas Muster in the final, 7–5, 6–3, 6–3 to win the singles tennis title at the 1990 Monte Carlo Open.
Alberto Mancini was the defending champion, but lost in the second round to Henri Leconte.

## Seeds

The top eight seeds received a bye to the second round.
* Stefan Edberg (third round)
* Boris Becker (quarterfinals)
* Andre Agassi (withdrew)
* Aaron Krickstein (second round)
* Jay Berger (second round)
* Andrés Gómez (third round)
* Emilio Sánchez (semifinals)
* Martín Jaite (second round)
* Jim Courier (third round)
* Carl-Uwe Steeb (first round)
* Alberto Mancini (second round)
* Andrei Chesnokov (champion)
* Guillermo Pérez Roldán (second round)
* Horst Skoff (quarterfinals)
* Magnus Gustafsson (first round)
* Sergi Bruguera (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 | Semifinals | Final | Final | Final | Final | Final |
| | Thomas Muster | 6 | 6 | | | | | | |
| WC | Henri Leconte | 1 | 2 | | | | | | |
| WC | Henri Leconte | 1 | 2 | | | Thomas Muster | 5 | 3 | 3 |
| | | | | | 12 | Andrei Chesnokov | 7 | 6 | 6 |
| 12 | Andrei Chesnokov | 4 | 6 | 7$^7$ | 12 | Andrei Chesnokov | 7 | 6 | 6 |
| 7 | Emilio Sánchez | 6 | 1 | 6$^2$ | | | | | |

### 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 |
| | | | | | 1 | S Edberg | 7$^7$ | 6 | | | | | | | | |
| | J Arias | 6 | 6 | | | J Arias | 6$^5$ | 3 | | | | | | | | |
| | G Muller | 1 | 3 | | | | | | | 1 | S Edberg | 6$^4$ | 6$^6$ | | | |
| | J Aguilera | 6 | 6 | | | | | | | | J Aguilera | 7$^7$ | 7$^8$ | | | |
| | D Nargiso | 1 | 3 | | | J Aguilera | 6$^9$ | 6 | | | | | | | | |
| | J-P Fleurian | 4 | 4 | | 16 | S Bruguera | 7$^{11}$ | 4 | r | | | | | | | |
| 16 | S Bruguera | 6 | 6 | | | | | | | | | | | J Aguilera | 3 | 4 |
| 9 | J Courier | 6 | 4 | 6 | | | | | | | | | | T Muster | 6 | 6 |
| | M Stich | 3 | 6 | 4 | 9 | J Courier | 6 | 6 | | | | | | | | |
| Q | C Bergström | 6 | 2 | 4 | | G Ivanišević | 3 | 1 | | | | | | | | |
| | G Ivanišević | 4 | 6 | 6 | | | | | | 9 | J Courier | 4 | 4 | | | |
| | T Muster | 6 | 6 | | | | | | | | T Muster | 6 | 6 | | | |
| | M Filippini | 2 | 2 | | | T Muster | 6 | 6 | | | | | | | | |
| | | | | | 8 | M Jaite | 3 | 2 | | | | | | | | |

#### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 4 | A Krickstein | 5 | 2 | | | | | | | | | | | |
| | P Canè | 6$^3$ | 5 | | J Arrese | 7 | 6 | | | | | | | | | | | |
| | J Arrese | 7$^7$ | 6 | | | | | | | J Arrese | 7$^7$ | 4 | 5 | | | | | |
| | K Nováček | 6 | 6 | | | | | | 14 | H Skoff | 6$^3$ | 6 | 7 | | | | | |
| | L Mattar | 4 | 1 | | K Nováček | 3 | 7$^{10}$ | 4 | | | | | | | | | | |
| | N Kroon | 0 | 4 | 14 | H Skoff | 6 | 6$^8$ | 6 | | | | | | | | | | |
| 14 | H Skoff | 6 | 6 | | | | | | | | | | | 14 | H Skoff | 2 | 7$^7$ | 4 |
| 11 | A Mancini | 6 | 6 | | | | | | | | | | | WC | H Leconte | 6 | 6$^3$ | 6 |
| | C van Rensburg | 2 | 4 | 11 | A Mancini | 4 | 4 | | | | | | | | | | | |
| WC | H Leconte | 6 | 6 | WC | H Leconte | 6 | 6 | | | | | | | | | | | |
| | T Witsken | 1 | 4 | | | | | | WC | H Leconte | 6 | 6 | | | | | | |
| | J Sánchez | 6 | 6 | | | | | | 6 | A Gómez | 3 | 4 | | | | | | |
| WC | F Santoro | 2 | 4 | | J Sánchez | 6$^1$ | 4 | | | | | | | | | | | |
| | | | | 6 | A Gómez | 7$^7$ | 6 | | | | | | | | | | | |

### Bottom half
#### Section 3

| 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 |
| | | | | 5 | J Berger | 6 | 4 | 1 | | | | | | | | |
| Q | L Jönsson | 3 | 1 | | J Yzaga | 4 | 6 | 6 | | | | | | | | |
| | J Yzaga | 6 | 6 | | | | | | | J Yzaga | 2 | 1 | | | | |
| | J Hlasek | 3 | 1 | | | | | | 12 | A Chesnokov | 6 | 6 | | | | |
| | T Carbonell | 6 | 6 | | T Carbonell | 1$^r$ | | | | | | | | | | |
| | G Prpić | 5 | 3 | 12 | A Chesnokov | 4 | | | | | | | | | | |
| 12 | A Chesnokov | 7 | 6 | | | | | | | | | | 12 | A Chesnokov | 6 | 6 |
| 13 | G Pérez Roldán | 6 | 6 | | | | | | | | | | WC | M Rosset | 3 | 2 |
| LL | D Pérez | 2 | 3 | 13 | G Pérez Roldán | 1 | 6$^2$ | | | | | | | | | |
| WC | M Rosset | 6 | 6 | WC | M Rosset | 6 | 7$^7$ | | | | | | | | | |
| Q | S Cortés | 4 | 4 | | | | | | WC | M Rosset | 6 | 6 | | | | |
| | J Gunnarsson | 0 | 0$^r$ | | | | | | Q | D Engel | 0 | 4 | | | | |
| Q | D Engel | 6 | 3 | Q | D Engel | 7 | 6 | | | | | | | | | |
| | | | | Q | G Markus | 5 | 4 | | | | | | | | | |

#### 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 | Quarterfinals |
| | | | | | 7 | E Sánchez | 6 | 6 | | | | | | | | | | | |
| Q | M Vajda | 6 | 6 | | Q | M Vajda | 1 | 1 | | | | | | | | | | | |
| | M Střelba | 4 | 2 | | | | | | | 7 | E Sánchez | 6 | 6 | | | | | | |
| | P Haarhuis | 3 | 5 | | | | | | | WC | G Forget | 2 | 2 | | | | | | |
| WC | G Forget | 6 | 7 | | WC | G Forget | 6 | 5 | 6 | | | | | | | | | | |
| | J Svensson | 7$^7$ | 6 | | | J Svensson | 4 | 7 | 1 | | | | | | | | | | |
| 10 | C-U Steeb | 6$^5$ | 3 | | | | | | | | | | | | 7 | E Sánchez | 4 | 7 | 7$^7$ |
| 15 | M Gustafsson | 2 | 2 | | | | | | | | | | | | 2 | B Becker | 6 | 5 | 6$^3$ |
| | R Agénor | 6 | 6 | | 15 | R Agénor | 6 | 6 | | | | | | | | | | | |
| | P Korda | 6 | 3 | 6 | | P Korda | 3 | 2 | | | | | | | | | | | |
| | Y Noah | 1 | 6 | 2 | | | | | | | R Agénor | 2 | 6 | 4 | | | | | |
| | M Šrejber | 1 | 1 | | | | | | | 2 | B Becker | 6 | 4 | 6 | | | | | |
| Q | C Pioline | 6 | 6 | | Q | C Pioline | 5 | 4 | | | | | | | | | | | |
| | | | | | 2 | B Becker | 7 | 6 | | | | | | | | | | | |