| Singles | |
|---|---|
| 1990 BMW Open | |
| Champion |  Karel Nováček |
| Runner-up |  Thomas Muster |
| Final score | 6–4, 6–2 |
| Draw | 32 |
| Seeds | 8 |
Andrei Chesnokov was the defending champion, but did not participate this year.
Karel Nováček won the title, defeating Thomas Muster 6–4, 6–2 in the final.
Stefan Edberg (second round)
Aaron Krickstein (second round) Michael Chang (first round) Jim Courier (quarterfinals)
Carl-Uwe Steeb (second round) Pete Sampras (first round)
Guillermo Pérez Roldán (first round) Horst Skoff (first round)| Semifinals | Final | ||||||||||||
| Thomas Muster | 6 | 6 | |||||||||||
| Petr Korda | 3 | 1 | |||||||||||
| Thomas Muster | 4 | 2 | |||||||||||
| Karel Nováček | 6 | 6 | |||||||||||
| Jonas Svensson | 1 | 6 | 1 | ||||||||||
| Karel Nováček | 6 | 2 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | S Edberg | 6 | 6 | ||||||||||||||||||||||||
 C van Rensburg | 1 | 0 | 1 | S Edberg | 4 | 1 | |||||||||||||||||||||
| M Střelba | 6 | 6 | M Střelba | 6 | 6 | ||||||||||||||||||||||
| Q |  S Pescosolido | 3 | 2 | M Střelba | 3r | ||||||||||||||||||||||
| T Witsken | 3 | 3 | T Muster | 4 | |||||||||||||||||||||||
| M Gustafsson | 6 | 6 | M Gustafsson | 5 | 2 | ||||||||||||||||||||||
| T Muster | 6 | 6 | T Muster | 7 | 6 | ||||||||||||||||||||||
| 7 | G Pérez Roldán | 4 | 4 | T Muster | 6 | 6 | |||||||||||||||||||||
| WC/3 | M Chang | 7 | 5 | 6 | P Korda | 3 | 1 | ||||||||||||||||||||
| P Korda | 6 | 7 | 7 | P Korda | 7 | 6 | |||||||||||||||||||||
| Q |  J Lozano | 3 | 6 | 4 | K Curren | 5 | 1 | ||||||||||||||||||||
| K Curren | 6 | 4 | 6 | P Korda | 6 | 7 | |||||||||||||||||||||
 Y Noah | 2 | 4 | J Wöhrmann | 3 | 5 | ||||||||||||||||||||||
| J Wöhrmann | 6 | 6 | J Wöhrmann | 7 | 6 | ||||||||||||||||||||||
| J Gunnarsson | 2 | 4 | 6 | C-U Steeb | 5 | 4 | |||||||||||||||||||||
| 5 | C-U Steeb | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | P Sampras | 0 | 1 | ||||||||||||||||||||||||
| J Svensson | 6 | 6 | J Svensson | 6 | 1 | ||||||||||||||||||||||
| M Šrejber | 7 | 6 | M Šrejber | 1 | 0r | ||||||||||||||||||||||
 G Prpić | 6 | 3 | J Svensson | 3 | 6 | 6 | |||||||||||||||||||||
| B Orešar | 7 | 6 | 6 | 4 | J Courier | 6 | 3 | 4 | |||||||||||||||||||
| M Stich | 6 | 7 | 4 | B Orešar | 2 | 1 | |||||||||||||||||||||
| P Canè | 6 | 2 | 4 | J Courier | 6 | 6 | |||||||||||||||||||||
| 4 | J Courier | 7 | 6 | J Svensson | 1 | 6 | 1 | ||||||||||||||||||||
| 8 | H Skoff | 2 | 6 | 3 | K Nováček | 6 | 2 | 6 | |||||||||||||||||||
| Q | C Bergström | 6 | 4 | 6 | Q | C Bergström | 6 | 4 | 6 | ||||||||||||||||||
| P Lundgren | 4 | 7 | 3 | WC | U Riglewski | 1 | 6 | 0 | |||||||||||||||||||
| WC | U Riglewski | 6 | 6 | 6 | Q | C Bergström | 1 | 1 | |||||||||||||||||||
| WC | H Schwaier | 3 | 4 | K Nováček | 6 | 6 | |||||||||||||||||||||
| K Nováček | 6 | 6 | K Nováček | 6 | 7 | ||||||||||||||||||||||
| Q | H de la Peña | 6 | 6 | 3 | 2 | A Krickstein | 2 | 6 | |||||||||||||||||||
| 2 | A Krickstein | 2 | 7 | 6 | |||||||||||||||||||||||
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