# 1989 Czechoslovak Open – Singles

Thomas Muster was the defending champion, but did not compete this year.
Marcelo Filippini won the title by defeating Horst Skoff 7–5, 7–6 in the final.

## Seeds

* Jordi Arrese (second round)
* Horst Skoff (final)
* Karel Nováček (first round)
* Marcelo Filippini (champion)
* Martin Střelba (quarterfinals)
* Eduardo Bengoechea (second round)
* Fernando Luna (first round)
* Lawson Duncan (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

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Michael Tauson | 2 | 6 | 3 | | | | |
| 4 | Marcelo Filippini | 6 | 2 | 6 | | | | |
| 4 | Marcelo Filippini | 6 | 2 | 6 | 4 | Marcelo Filippini | 7 | 7 |
| | | | | | 2 | Horst Skoff | 5 | 6 |
| | Franco Davín | 2 | 2 | | 2 | Horst Skoff | 5 | 6 |
| 2 | Horst Skoff | 6 | 6 | | | | | |

### Top 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | J Arrese | 6 | 7 | | | | | | | | | | | | | | | |
| | G Bloom | 2 | 6 | | 1 | J Arrese | 1 | 6 | | | | | | | | | | |
| | P Korda | 6 | 6 | | | P Korda | 6 | 7 | | | | | | | | | | |
| Q | Ģ Dzelde | 2 | 0 | | | | | | | | P Korda | 4 | 0 | | | | | |
| | T Haldin | 2 | 6 | 1 | | | | | | | M Tauson | 6 | 6 | | | | | |
| | M Tauson | 6 | 1 | 6 | | M Tauson | 7 | 5 | 6 | | | | | | | | | |
| | G Giussani | 5 | 6 | 7 | | G Giussani | 6 | 7 | 4 | | | | | | | | | |
| 8 | L Duncan | 7 | 0 | 5 | | | | | | | | | | | M Tauson | 2 | 6 | 3 |
| 4 | M Filippini | 6 | 6 | | | | | | | | | | | 4 | M Filippini | 6 | 2 | 6 |
| | J Bulant | 1 | 0 | | 4 | M Filippini | 6 | 6 | | | | | | | | | | |
| Q | Petr Hájek | 4 | 6 | | | G Rivas | 1 | 1 | | | | | | | | | | |
| | G Rivas | 6 | 7 | | | | | | | 4 | M Filippini | 6 | 6 | | | | | |
| | F Clavet | 3 | 6 | 6 | | | | | | 5 | M Střelba | 3 | 4 | | | | | |
| WC | S Doseděl | 6 | 4 | 1 | | F Clavet | 2 | 6 | 1 | | | | | | | | | |
| | T Šmíd | 3 | 4 | | 5 | M Střelba | 6 | 2 | 6 | | | | | | | | | |
| 5 | M Střelba | 6 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | E Bengoechea | 6 | 6 | | | | | | | | | | | | | | |
| WC | M Damm | 0 | 2 | | 6 | E Bengoechea | 4 | 6 | 4 | | | | | | | | |
| | J Aguilera | 6 | 6 | | | J Aguilera | 6 | 3 | 6 | | | | | | | | |
| WC | T Anzari | 3 | 2 | | | | | | | | J Aguilera | 4 | 1 | | | | |
| | J Čihák | 0$^r$ | | | | | | | | | F Davín | 6 | 6 | | | | |
| Q | V Roubíček | 1 | | | Q | V Roubíček | 4 | 2 | | | | | | | | | |
| | F Davín | 6 | 5 | 6 | | F Davín | 6 | 6 | | | | | | | | | |
| 3 | K Nováček | 1 | 7 | 3 | | | | | | | | | | | F Davín | 2 | 2 |
| 7 | F Luna | 6 | 2 | | | | | | | | | | | 2 | H Skoff | 6 | 6 |
| Q | D Rikl | 7 | 6 | | Q | D Rikl | 2 | 6 | | | | | | | | | |
| | M Ostoja | 6 | 6 | | | M Ostoja | 6 | 7 | | | | | | | | | |
| | T Nydahl | 4 | 2 | | | | | | | | M Ostoja | 4 | 0 | | | | |
| | C Suk | 6 | 6 | | | | | | | 2 | H Skoff | 6 | 6 | | | | |
| | R Azar | 1 | 1 | | | C Suk | 4 | 6 | | | | | | | | | |
| | C Allgårdh | 0 | 3 | | 2 | H Skoff | 6 | 7 | | | | | | | | | |
| 2 | H Skoff | 6 | 6 | | | | | | | | | | | | | | |