1989 Dutch Open – Singles
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Emilio Sánchez was the defending champion, but finished runner-up this year.
Karel Nováček won the tournament, beating Sánchez in the final, 6–2, 6–4.
Seeds
- Sweden Kent Carlsson (first round)
- Spain Emilio Sánchez (final)
- Soviet Union Andrei Chesnokov (quarterfinals)
- Austria Horst Skoff (quarterfinals)
- Italy Paolo Canè (semifinals)
- N/A
- Spain Javier Sánchez (second round)
- Czechoslovakia Karel Nováček (champion)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
Finals
| Semifinals | Final | ||||||||||||
| 8 | Czechoslovakia Karel Nováček | 6 | 7 | ||||||||||
| Spain Tomás Carbonell | 3 | 6 | |||||||||||
| 8 | Czechoslovakia Karel Nováček | 6 | 6 | ||||||||||
| 2 | Spain Emilio Sánchez | 2 | 4 | ||||||||||
| 5 | Italy Paolo Canè | 2 | 2 | ||||||||||
| 2 | Spain Emilio Sánchez | 6 | 6 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Sweden K Carlsson | 3 | 5 | ||||||||||||||||||||||||
| Netherlands P Haarhuis | 6 | 7 | Netherlands P Haarhuis | 7 | 6 | ||||||||||||||||||||||
| Q | Argentina R Azar | 1 | 6 | 6 | Q | Argentina R Azar | 6 | 2 | |||||||||||||||||||
| Sweden N Kroon | 6 | 3 | 2 | Netherlands P Haarhuis | 2 | 3 | |||||||||||||||||||||
| Spain S Casal | 6 | 6 | 8 | Czechoslovakia K Nováček | 6 | 6 | |||||||||||||||||||||
| Austria S Lochbihler | 2 | 2 | Spain S Casal | 3 | 6 | 3 | |||||||||||||||||||||
| Czechoslovakia J Čihák | 6 | 3 | 6 | 8 | Czechoslovakia K Nováček | 6 | 3 | 6 | |||||||||||||||||||
| 8 | Czechoslovakia K Nováček | 2 | 6 | 7 | 8 | Czechoslovakia K Nováček | 6 | 7 | |||||||||||||||||||
| 4 | Austria H Skoff | 6 | 6 | Spain T Carbonell | 3 | 6 | |||||||||||||||||||||
| West Germany U Riglewski | 4 | 4 | 4 | Austria H Skoff | 6 | 7 | |||||||||||||||||||||
| Sweden T Nydahl | 6 | 6 | 7 | Sweden T Nydahl | 2 | 6 | |||||||||||||||||||||
| Q | Spain F Clavet | 1 | 7 | 6 | 4 | Austria H Skoff | 5 | 3 | |||||||||||||||||||
| WC | Netherlands HJ Davids | 1 | 4 | Spain T Carbonell | 7 | 6 | |||||||||||||||||||||
| Italy C Pistolesi | 6 | 6 | Italy C Pistolesi | 6 | 5 | 2 | |||||||||||||||||||||
| Spain Tomás Carbonell (tennis)T Carbonell | 6 | 6 | Spain T Carbonell | 4 | 7 | 6 | |||||||||||||||||||||
| LL | Netherlands R Kok | 1 | 2 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | Italy P Canè | 6 | 6 | 6 | |||||||||||||||||||||||
| LL | Sweden P Nyborg | 4 | 7 | 1 | 5 | Italy P Canè | 6 | 6 | |||||||||||||||||||
| Czechoslovakia J Bulant | 6 | 2 | Q | West Germany C Geyer | 4 | 2 | |||||||||||||||||||||
| Q | West Germany C Geyer | 7 | 6 | 5 | Italy P Canè | 7 | 1 | 6 | |||||||||||||||||||
| Uruguay D Pérez | 6 | 6 | 3 | Soviet Union A Chesnokov | 5 | 6 | 4 | ||||||||||||||||||||
| Australia C Limberger | 1 | 0 | Uruguay D Pérez | 2 | 2 | ||||||||||||||||||||||
| France T Champion | 3 | 1 | 3 | Soviet Union A Chesnokov | 6 | 6 | |||||||||||||||||||||
| 3 | Soviet Union A Chesnokov | 6 | 6 | 5 | Italy P Canè | 2 | 2 | ||||||||||||||||||||
| 7 | Spain J Sánchez | 6 | 7 | 2 | Spain E Sánchez | 6 | 6 | ||||||||||||||||||||
| WC | Netherlands P Dogger | 3 | 6 | 7 | Spain J Sánchez | 6 | 6 | 6 | |||||||||||||||||||
| Q | Netherlands J Eltingh | 5 | 1 | Argentina F Davín | 7 | 3 | 7 | ||||||||||||||||||||
| Argentina F Davín | 7 | 6 | Argentina F Davín | 7 | 1 | 3 | |||||||||||||||||||||
| Soviet Union A Võsand | 1 | 3 | 2 | Spain E Sánchez | 6 | 6 | 6 | ||||||||||||||||||||
| Argentina G Giussani | 6 | 6 | Argentina G Giussani | 6 | 2 | 2 | |||||||||||||||||||||
| Netherlands T Nijssen | 6 | 5 | 2 | Spain E Sánchez | 1 | 6 | 6 | ||||||||||||||||||||
| 2 | Spain E Sánchez | 7 | 7 |