# 1990 Czechoslovak Open – Singles

Marcelo Filippini was the defending champion, but lost in the second round to Nicklas Kulti.
Jordi Arrese won the title by defeating Kulti 7–6, 7–6 in the final.

## Seeds

* Thomas Muster (first round, retired)
* Guillermo Pérez Roldán (first round, retired)
* Horst Skoff (quarterfinals)
* Marcelo Filippini (second round)
* Franco Davín (quarterfinals)
* Goran Prpić (semifinals)
* Magnus Larsson (first round)
* Jordi Arrese (champion)

## 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 |
| | Horacio de la Peña | 3 | 0$^r$ | | | | |
| | Nicklas Kulti | 6 | 1 | | | | |
| | Nicklas Kulti | 6 | 1 | | Nicklas Kulti | 6 | 6 |
| | | | | 8 | Jordi Arrese | 7 | 7 |
| 6 | Goran Prpić | 5 | 4 | 8 | Jordi Arrese | 7 | 7 |
| 8 | Jordi Arrese | 7 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | T Muster | 0$^r$ | | | | | | | | | | | | | | |
| | C Pistolesi | 1 | | | | C Pistolesi | 3 | 3 | | | | | | | | |
| | T Benhabiles | 6 | 3 | 6 | | T Benhabiles | 6 | 6 | | | | | | | | |
| | F Luna | 4 | 6 | 4 | | | | | | T Benhabiles | 2 | 6 | | | | |
| Q | S Pescosolido | 6 | 6 | | | | | | | H de la Peña | 6 | 7 | | | | |
| Q | R Hanák | 3 | 1 | | Q | S Pescosolido | 3 | 1 | | | | | | | | |
| | H de la Peña | 6 | 6 | | | H de la Peña | 6 | 6 | | | | | | | | |
| 7 | M Larsson | 0 | 2 | | | | | | | | | | | H de la Peña | 3 | 0$^r$ |
| 4 | M Filippini | 7 | 6 | | | | | | | | | | | N Kulti | 6 | 1 |
| Q | C Suk | 6 | 1 | | 4 | M Filippini | 1 | 3 | | | | | | | | |
| | A Mronz | 3 | 2 | | | N Kulti | 6 | 6 | | | | | | | | |
| | N Kulti | 6 | 6 | | | | | | | N Kulti | 6 | 1 | 6 | | | |
| | B Wuyts | 2 | 6 | 6 | | | | | 5 | F Davín | 3 | 6 | 2 | | | |
| | R Azar | 6 | 3 | 3 | | B Wuyts | 3 | 2 | | | | | | | | |
| | J Brown | 3 | 6 | 3 | 5 | F Davín | 6 | 6 | | | | | | | | |
| 5 | F Davín | 6 | 2 | 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 |
| 6 | G Prpić | 4 | 6 | 6 | | | | | | | | | | | | | | |
| | P Vojtíšek | 6 | 3 | 1 | 6 | G Prpić | 7 | 6 | | | | | | | | | | |
| | V Paloheimo | 6 | 6 | | | V Paloheimo | 5 | 0 | | | | | | | | | | |
| | M Střelba | 0 | 2 | | | | | | | 6 | G Prpić | 2 | 6 | 7 | | | | |
| | M Vajda | 3 | 6 | 6 | | | | | | 3 | H Skoff | 6 | 3 | 6 | | | | |
| | F Clavet | 6 | 4 | 2 | | M Vajda | 4 | 1 | | | | | | | | | | |
| | L Duncan | 2 | 1 | | 3 | H Skoff | 6 | 6 | | | | | | | | | | |
| 3 | H Skoff | 6 | 6 | | | | | | | | | | | | 6 | G Prpić | 5 | 4 |
| 8 | J Arrese | 6 | 6 | | | | | | | | | | | | 8 | J Arrese | 7 | 6 |
| WC | S Doseděl | 4 | 4 | | 8 | J Arrese | 2 | 6 | 6 | | | | | | | | | |
| | C Pioline | 6 | 2 | | WC | J Kodeš Jr. | 6 | 0 | 2 | | | | | | | | | |
| WC | J Kodeš Jr. | 7 | 6 | | | | | | | 8 | J Arrese | w/o | | | | | | |
| | C Saceanu | 6 | 6 | | | | | | | | C Saceanu | | | | | | | |
| WC | M Damm | 4 | 3 | | | C Saceanu | 6 | 2 | 7 | | | | | | | | | |
| Q | S Hiršzon | 6 | | | Q | S Hiršzon | 2 | 6 | 6 | | | | | | | | | |
| 2 | G Pérez Roldán | 1 | r | | | | | | | | | | | | | | | |