2003 Ordina Open – Men's singles
# 2003 Ordina Open – Men's singles

Sjeng Schalken was the defending champion and won in the final 6–3, 6–4 against Arnaud Clément.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

* Jiří Novák (quarterfinals)
* Paradorn Srichaphan (second round)
* Sjeng Schalken (champion)
* Martin Verkerk (first round)
* Sébastien Grosjean (second round)
* Tommy Robredo (quarterfinals)
* Arnaud Clément (final)
* José Acasuso (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

| 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 | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| WC/1 | J Novák | 6 | 6 | | | | | | | | | | | | | | | | | | | |
| | J Melzer | 1 | 3 | | WC/1 | J Novák | 6 | 6 | | | | | | | | | | | | | | |
| | O Mutis | 6 | $7^7$ | | | O Mutis | 2 | 4 | | | | | | | | | | | | | | |
| | R Krajicek | 4 | $6^4$ | | | | | | | WC/1 | J Novák | 4 | 4 | | | | | | | | | |
| | J Vacek | $7^7$ | 6 | | | | | | | | J Vacek | 6 | 6 | | | | | | | | | |
| | A Dupuis | $6^2$ | 3 | | | J Vacek | 6 | 3 | 6 | | | | | | | | | | | | | |
| Q | P Petzschner | 2 | 7 | 3 | 5 | S Grosjean | 4 | 6 | 2 | | | | | | | | | | | | | |
| 5 | S Grosjean | 6 | 5 | 6 | | | | | | | | | | | | J Vacek | 3 | 4 | | | | |
| 4 | M Verkerk | 6 | 4 | $6^{11}$ | | | | | | | | | | | 7 | A Clément | 6 | 6 | | | | |
| | L Burgsmüller | 3 | 6 | $7^{13}$ | | L Burgsmüller | 6 | 4 | 4 | | | | | | | | | | | | | |
| | F Vicente | 0 | $7^{12}$ | 6 | | F Vicente | 4 | 6 | 6 | | | | | | | | | | | | | |
| | D Sanguinetti | 6 | $6^{10}$ | 2 | | | | | | | F Vicente | 6 | 3 | 0 | | | | | | | | |
| WC | D v Scheppingen | 3 | 6 | 6 | | | | | | 7 | A Clément | 4 | 6 | 6 | | | | | | | | |
| | F López | 6 | 4 | 3 | WC | D van Scheppingen | $6^4$ | $7^7$ | 3 | | | | | | | | | | | | | |
| WC | F Hemmes Jr. | 2 | 3 | | 7 | A Clément | $7^7$ | $6^5$ | 6 | | | | | | | | | | | | | |
| 7 | A Clément | 6 | 6 | | | | | | | | | | | | | | | | 7 | Arnaud Clément | 3 | 4 |
| 6 | T Robredo | 5 | $7^7$ | 6 | | | | | | | | | | | | | | | 3 | Sjeng Schalken | 6 | 6 |
| LL | F Moser | 7 | $6^1$ | 2 | 6 | T Robredo | 6 | 2 | 6 | | | | | | | | | | | | | |
| | K Carlsen | 6 | 6 | | | K Carlsen | 4 | 6 | 3 | | | | | | | | | | | | | |
| Q | Y Allegro | 4 | 3 | | | | | | | 6 | T Robredo | 5 | 4 | | | | | | | | | |
| | M Ančić | 2 | 3 | | | | | | | 3 | S Schalken | 7 | 6 | | | | | | | | | |
| | C Rochus | 6 | 6 | | | C Rochus | 0 | 0 | | | | | | | | | | | | | | |
| | A Portas | 2 | 2 | | 3 | S Schalken | 6 | 6 | | | | | | | | | | | | | | |
| 3 | S Schalken | 6 | 6 | | | | | | | | | | | | 3 | S Schalken | 6 | 6 | | | | |
| 8 | J Acasuso | 3 | 2 | | | | | | | | | | | | | R Sluiter | 3 | 4 | | | | |
| | J van Lottum | 6 | 6 | | | J van Lottum | 6 | 6 | | | | | | | | | | | | | | |
| Q | F Čermák | 6 | | | Q | F Čermák | 4 | 3 | | | | | | | | | | | | | | |
| | N Kiefer | 3 | r | | | | | | | | J van Lottum | 4 | 5 | | | | | | | | | |
| | K Beck | 3 | 5 | | | | | | | | R Sluiter | 6 | 7 | | | | | | | | | |
| | R Sluiter | 6 | 7 | | | R Sluiter | 7 | 6 | | | | | | | | | | | | | | |
| Q | P Logtens | 4 | 6 | 4 | 2 | P Srichaphan | 5 | 4 | | | | | | | | | | | | | | |
| 2 | P Srichaphan | 6 | 4 | 6 | | | | | | | | | | | | | | | | | | |
