1991 Dutch Open – Singles
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Francisco Clavet was the defending champion of the singles event at the Dutch Open men's tennis tournament, but he lost to Magnus Gustafsson.
Gustafsson won in the final 5–7, 7–6(7–2), 2–6, 6–1, 6–0 against Jordi Arrese.
Seeds
Champion seeds are indicated in bold while text in italics indicates the round in which that seed was eliminated.
- Spain Sergi Bruguera (second round)
- Czechoslovakia Karel Nováček (semifinals)
- Soviet Union Andrei Cherkasov (first round)
- Sweden Magnus Gustafsson (champion)
- Socialist Federal Republic of Yugoslavia Goran Prpić (second round)
- Austria Horst Skoff (second round)
- Argentina Guillermo Pérez Roldán (first round)
- Italy Omar Camporese (second round)
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 | ||||||||||||||
| Netherlands Mark Koevermans | 3 | 6 | 4 | ||||||||||||
| Spain Jordi Arrese | 6 | 3 | 6 | ||||||||||||
| Spain Jordi Arrese | 7 | 62 | 6 | 1 | 0 | ||||||||||
| 4 | Sweden Magnus Gustafsson | 5 | 77 | 2 | 6 | 6 | |||||||||
| 4 | Sweden Magnus Gustafsson | 7 | 6 | ||||||||||||
| 2 | Czechoslovakia Karel Nováček | 6 | 3 |
Section 1
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Spain S Bruguera | 6 | 6 | ||||||||||||||||||||||||
| Q | Uruguay D Pérez | 4 | 4 | 1 | Spain S Bruguera | 5 | 4 | ||||||||||||||||||||
| Netherlands M Koevermans | 7 | 6 | Netherlands M Koevermans | 7 | 6 | ||||||||||||||||||||||
| Netherlands P Haarhuis | 4 | 2 | Netherlands M Koevermans | 6 | 6 | ||||||||||||||||||||||
| Q | Italy R Furlan | 3 | 6 | 6 | Italy R Furlan | 1 | 1 | ||||||||||||||||||||
| Uruguay M Filippini | 6 | 2 | 1 | Q | Italy R Furlan | 1 | 7 | 6 | |||||||||||||||||||
| 8 | Italy O Camporese | 6 | 6 | 8 | Italy O Camporese | 6 | 6 | 2 | |||||||||||||||||||
| Argentina M Jaite | 1 | 3 | Netherlands M Koevermans | 3 | 6 | 4 | |||||||||||||||||||||
| 6 | Austria H Skoff | 6 | 6 | Spain J Arrese | 6 | 3 | 6 | ||||||||||||||||||||
| WC | Netherlands J Eltingh | 4 | 3 | 6 | Austria H Skoff | 6 | 6 | 2 | |||||||||||||||||||
| Spain J Arrese | 6 | 6 | Spain J Arrese | 3 | 7 | 6 | |||||||||||||||||||||
| Q | France O Delaître | 0 | 2 | Spain J Arrese | 6 | 6 | |||||||||||||||||||||
| Spain T Carbonell | 6 | 6 | WC | Austria T Muster | 4 | 1 | |||||||||||||||||||||
| Haiti R Agénor | 1 | 3 | Spain T Carbonell | 7 | 1 | 1 | |||||||||||||||||||||
| WC | Austria T Muster | 6 | 6 | WC | Austria T Muster | 6 | 6 | 6 | |||||||||||||||||||
| 3 | Soviet Union A Cherkasov | 3 | 3 |
Section 2
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 4 | Sweden M Gustafsson | 7 | 7 | ||||||||||||||||||||||||
| Spain F Clavet | 6 | 6 | 4 | Sweden M Gustafsson | 7 | 7 | |||||||||||||||||||||
| Sweden L Jonsson | 3 | 6 | 6 | Sweden L Jonsson | 5 | 5 | |||||||||||||||||||||
| Argentina H de la Peña | 6 | 4 | 0 | 4 | Sweden M Gustafsson | 6 | 6 | 6 | |||||||||||||||||||
| Switzerland M Rosset | 6 | 6 | Switzerland M Rosset | 7 | 2 | 4 | |||||||||||||||||||||
| Netherlands R Krajicek | 4 | 4 | Switzerland M Rosset | 7 | 3 | 6 | |||||||||||||||||||||
| 5 | Socialist Federal Republic of Yugoslavia G Prpić | 6 | 7 | 5 | Socialist Federal Republic of Yugoslavia G Prpić | 6 | 6 | 4 | |||||||||||||||||||
| Q | Germany K Braasch | 3 | 6 | 4 | Sweden M Gustafsson | 7 | 6 | ||||||||||||||||||||
| 7 | Argentina G Pérez Roldán | 4 | 6 | 6 | 2 | Czechoslovakia K Nováček | 6 | 3 | |||||||||||||||||||
| WC | France T Champion | 6 | 3 | 7 | WC | France T Champion | 6 | 4 | 4 | ||||||||||||||||||
| Argentina F Davín | 6 | 6 | Argentina F Davín | 3 | 6 | 6 | |||||||||||||||||||||
| Netherlands J Siemerink | 4 | 3 | Argentina F Davín | 6 | 6 | 2 | |||||||||||||||||||||
| France C Pioline | 6 | 6 | 2 | Czechoslovakia K Nováček | 7 | 2 | 6 | ||||||||||||||||||||
| Q | Spain F Roig | 4 | 2 | France C Pioline | 4 | 4 | |||||||||||||||||||||
| Argentina A Mancini | 7 | 3 | 1 | 2 | Czechoslovakia K Nováček | 6 | 6 | ||||||||||||||||||||
| 2 | Czechoslovakia K Nováček | 5 | 6 | 6 |