2004 Dutch Open – Singles
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Nicolás Massú was the defending champion, but lost in the semifinals this year.
Martin Verkerk won the tournament, beating Fernando González in the final, 7–6(7–5), 4–6, 6–4.
Seeds
- Chile Nicolás Massú (semifinals)
- Chile Fernando González (final)
- Peru Luis Horna (first round)
- Netherlands Martin Verkerk (champion)
- Spain David Sánchez (quarterfinals)
- Russia Igor Andreev (quarterfinals)
- Spain Alberto Martín (quarterfinals)
- Spain Albert Montañés (first 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 | ||||||||||||
| 1 | Chile Nicolás Massú | 3 | 77 | 3 | |||||||||
| 4 | Netherlands Martin Verkerk | 6 | 64 | 6 | |||||||||
| 4 | Netherlands Martin Verkerk | 77 | 4 | 6 | |||||||||
| 2 | Chile Fernando González | 65 | 6 | 4 | |||||||||
| Netherlands Dennis van Scheppingen | 65 | 4 | |||||||||||
| 2 | Chile Fernando González | 77 | 6 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Chile N Massú | 6 | 6 | ||||||||||||||||||||||||
| Belgium K Vliegen | 3 | 4 | 1 | Chile N Massú | 6 | 77 | |||||||||||||||||||||
| Netherlands R Sluiter | 6 | 6 | Netherlands R Sluiter | 4 | 64 | ||||||||||||||||||||||
| France N Thomann | 1 | 3 | 1 | Chile N Massú | 6 | 6 | |||||||||||||||||||||
| Belgium O Rochus | 3 | 62 | Germany T Behrend | 2 | 3 | ||||||||||||||||||||||
| Spain A Portas | 6 | 77 | Spain A Portas | 2 | 7 | 2 | |||||||||||||||||||||
| Germany T Behrend | 6 | 6 | Germany T Behrend | 6 | 5 | 6 | |||||||||||||||||||||
| 8 | Spain A Montañés | 3 | 0 | 1 | Chile N Massú | 3 | 77 | 3 | |||||||||||||||||||
| 4 | Netherlands M Verkerk | 6 | 3 | 6 | 4 | Netherlands M Verkerk | 6 | 64 | 6 | ||||||||||||||||||
| WC | Netherlands M van Gemerden | 4 | 6 | 1 | 4 | Netherlands M Verkerk | 65 | 77 | 6 | ||||||||||||||||||
| Switzerland M Rosset | 5 | 1 | Chile A García | 77 | 64 | 2 | |||||||||||||||||||||
| Chile A García | 7 | 6 | 4 | Netherlands M Verkerk | 1 | 77 | 6 | ||||||||||||||||||||
| WC | Netherlands P Wessels | 6 | 3 | 3 | 5 | Spain D Sánchez | 6 | 62 | 4 | ||||||||||||||||||
| France J-R Lisnard | 2 | 6 | 6 | France J-R Lisnard | 2 | 6 | 3 | ||||||||||||||||||||
| Q | Poland M Przysiężny | 4 | 4 | 5 | Spain D Sánchez | 6 | 3 | 6 | |||||||||||||||||||
| 5 | Spain D Sánchez | 6 | 6 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | Spain A Martín | 6 | 6 | ||||||||||||||||||||||||
| WC | Netherlands Nick van der Meer | 0 | 4 | 7 | Spain A Martín | 6 | 4 | 78 | |||||||||||||||||||
| Q | Australia P Luczak | 6 | 4 | 6 | Q | Australia P Luczak | 4 | 6 | 66 | ||||||||||||||||||
| Netherlands J van Lottum | 4 | 6 | 2 | 7 | Spain A Martín | 4 | 2 | ||||||||||||||||||||
| Q | Czech Republic J Vaněk | 3 | 6 | 4 | Netherlands D van Scheppingen | 6 | 6 | ||||||||||||||||||||
| Netherlands D van Scheppingen | 6 | 2 | 6 | Netherlands D van Scheppingen | 6 | 6 | |||||||||||||||||||||
| Q | Colombia A Falla | 6 | 6 | Q | Colombia A Falla | 2 | 0 | ||||||||||||||||||||
| 3 | Peru L Horna | 2 | 1 | Netherlands D van Scheppingen | 65 | 4 | |||||||||||||||||||||
| 6 | Russia I Andreev | 6 | 6 | 2 | Chile F González | 77 | 6 | ||||||||||||||||||||
| Spain R Ramírez Hidalgo | 2 | 2 | 6 | Russia I Andreev | 4 | 6 | 6 | ||||||||||||||||||||
| Belgium C Rochus | 7 | 6 | Belgium C Rochus | 6 | 2 | 1 | |||||||||||||||||||||
| Brazil F Saretta | 5 | 3 | 6 | Russia I Andreev | 3 | 5 | |||||||||||||||||||||
| Spain Ó Hernández | 6 | 6 | 2 | Chile F González | 6 | 7 | |||||||||||||||||||||
| France O Mutis | 1 | 3 | Spain Ó Hernández | 5 | 3 | ||||||||||||||||||||||
| Argentina J Acasuso | 6 | 4 | 1 | 2 | Chile F González | 7 | 6 | ||||||||||||||||||||
| 2 | Chile F González | 4 | 6 | 6 |