# 2004 Dutch Open – Singles

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

* Nicolás Massú (semifinals)
* Fernando González (final)
* Luis Horna (first round)
* Martin Verkerk (champion)
* David Sánchez (quarterfinals)
* Igor Andreev (quarterfinals)
* Alberto Martín (quarterfinals)
* Albert Montañés (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 | Final |
| 1 | Nicolás Massú | 3 | 7$^7$ | 3 | | | | | |
| 4 | Martin Verkerk | 6 | 6$^4$ | 6 | | | | | |
| 4 | Martin Verkerk | 6 | 6$^4$ | 6 | 4 | Martin Verkerk | 7$^7$ | 4 | 6 |
| | | | | | 2 | Fernando González | 6$^5$ | 6 | 4 |
| | Dennis van Scheppingen | 6$^5$ | 4 | | 2 | Fernando González | 6$^5$ | 6 | 4 |
| 2 | Fernando González | 7$^7$ | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | N Massú | 6 | 6 | | | | | | | | | | | | | | | | |
| | K Vliegen | 3 | 4 | | 1 | N Massú | 6 | 7$^7$ | | | | | | | | | | | |
| | R Sluiter | 6 | 6 | | | R Sluiter | 4 | 6$^4$ | | | | | | | | | | | |
| | N Thomann | 1 | 3 | | | | | | | 1 | N Massú | 6 | 6 | | | | | | |
| | O Rochus | 3 | 6$^2$ | | | | | | | | T Behrend | 2 | 3 | | | | | | |
| | A Portas | 6 | 7$^7$ | | | A Portas | 2 | 7 | 2 | | | | | | | | | | |
| | T Behrend | 6 | 6 | | | T Behrend | 6 | 5 | 6 | | | | | | | | | | |
| 8 | A Montañés | 3 | 0 | | | | | | | | | | | | 1 | N Massú | 3 | 7$^7$ | 3 |
| 4 | M Verkerk | 6 | 3 | 6 | | | | | | | | | | | 4 | M Verkerk | 6 | 6$^4$ | 6 |
| WC | M van Gemerden | 4 | 6 | 1 | 4 | M Verkerk | 6$^5$ | 7$^7$ | 6 | | | | | | | | | | |
| | M Rosset | 5 | 1 | | | A García | 7$^7$ | 6$^4$ | 2 | | | | | | | | | | |
| | A García | 7 | 6 | | | | | | | 4 | M Verkerk | 1 | 7$^7$ | 6 | | | | | |
| WC | P Wessels | 6 | 3 | 3 | | | | | | 5 | D Sánchez | 6 | 6$^2$ | 4 | | | | | |
| | J-R Lisnard | 2 | 6 | 6 | | J-R Lisnard | 2 | 6 | 3 | | | | | | | | | | |
| Q | M Przysiężny | 4 | 4 | | 5 | D Sánchez | 6 | 3 | 6 | | | | | | | | | | |
| 5 | D Sánchez | 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 |
| 7 | A Martín | 6 | 6 | | | | | | | | | | | | | | |
| WC | Nick van der Meer | 0 | 4 | | 7 | A Martín | 6 | 4 | 7$^8$ | | | | | | | | |
| Q | P Luczak | 6 | 4 | 6 | Q | P Luczak | 4 | 6 | 6$^6$ | | | | | | | | |
| | J van Lottum | 4 | 6 | 2 | | | | | | 7 | A Martín | 4 | 2 | | | | |
| Q | J Vaněk | 3 | 6 | 4 | | | | | | | D van Scheppingen | 6 | 6 | | | | |
| | D van Scheppingen | 6 | 2 | 6 | | D van Scheppingen | 6 | 6 | | | | | | | | | |
| Q | A Falla | 6 | 6 | | Q | A Falla | 2 | 0 | | | | | | | | | |
| 3 | L Horna | 2 | 1 | | | | | | | | | | | | D van Scheppingen | 6$^5$ | 4 |
| 6 | I Andreev | 6 | 6 | | | | | | | | | | | 2 | F González | 7$^7$ | 6 |
| | R Ramírez Hidalgo | 2 | 2 | | 6 | I Andreev | 4 | 6 | 6 | | | | | | | | |
| | C Rochus | 7 | 6 | | | C Rochus | 6 | 2 | 1 | | | | | | | | |
| | F Saretta | 5 | 3 | | | | | | | 6 | I Andreev | 3 | 5 | | | | |
| | Ó Hernández | 6 | 6 | | | | | | | 2 | F González | 6 | 7 | | | | |
| | O Mutis | 1 | 3 | | | Ó Hernández | 5 | 3 | | | | | | | | | |
| | J Acasuso | 6 | 4 | 1 | 2 | F González | 7 | 6 | | | | | | | | | |
| 2 | F González | 4 | 6 | 6 | | | | | | | | | | | | | |