# 2003 Copenhagen Open – Singles

Lars Burgsmüller was the defending champion but lost in the second round to Olivier Rochus.
Karol Kučera won in the final 7–6$^{(7–4)}$ , 6–4 against Rochus.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Jarkko Nieminen (first round)
* Wayne Arthurs (semifinals)
* Karol Kučera (champion)
* Radek Štěpánek (semifinals)
* Kenneth Carlsen (first round)
* Martin Verkerk (first round)
* Mario Ančić (first round)
* Raemon Sluiter (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 | Semifinals | Final | Final | Final | Final |
| 1 | J Nieminen | 3 | 2 | | | | | | | | | | | | | | | | | | | | |
| | O Rochus | 6 | 6 | | | O Rochus | 6 | 6 | | | | | | | | | | | | | | | |
| | J Melzer | 4 | 4 | | | L Burgsmüller | 1 | 2 | | | | | | | | | | | | | | | |
| | L Burgsmüller | 6 | 6 | | | | | | | | O Rochus | 6 | 6 | | | | | | | | | | |
| | J Vaněk | 6 | 2 | 6 | | | | | | | T Behrend | 4 | 1 | | | | | | | | | | |
| WC | R Nørby | 4 | 6 | 3 | | J Vaněk | 7$^7$ | 3 | 3 | | | | | | | | | | | | | | |
| Q | T Behrend | 6 | 6$^7$ | 7$^7$ | | T Behrend | 6$^4$ | 6 | 6 | | | | | | | | | | | | | | |
| 7 | M Ančić | 4 | 7$^9$ | 6$^2$ | | | | | | | | | | | | O Rochus | 6 | 6$^2$ | 6 | | | | |
| 4 | R Štěpánek | 7$^7$ | 3 | 6 | | | | | | | | | | | 4 | R Štěpánek | 3 | 7$^7$ | 4 | | | | |
| | A di Pasquale | 6$^3$ | 6 | 3 | 4 | R Štěpánek | 6 | 1 | 6 | | | | | | | | | | | | | | |
| WC | F Nielsen | 1 | 1 | | Q | M Larsson | 4 | 6 | 1 | | | | | | | | | | | | | | |
| Q | M Larsson | 6 | 6 | | | | | | | 4 | R Štěpánek | 6 | 1 | 6 | | | | | | | | | |
| | J Gimelstob | 4 | 3 | | | | | | | | K Beck | 4 | 6 | 2 | | | | | | | | | |
| | K Beck | 6 | 6 | | | K Beck | 4 | 7$^7$ | 1 | | | | | | | | | | | | | | |
| | A Dupuis | 6 | 6 | | | A Dupuis | 6 | 6$^5$ | 0/r | | | | | | | | | | | | | | |
| 6 | M Verkerk | 4 | 4 | | | | | | | | | | | | | | | | | | Olivier Rochus | 6$^4$ | 4 |
| 5 | K Carlsen | 7$^7$ | 3 | 4 | | | | | | | | | | | | | | | | 3 | Karol Kučera | 7$^7$ | 6 |
| | M Kratochvil | 6$^3$ | 6 | 6 | | M Kratochvil | 7$^7$ | 7$^8$ | | | | | | | | | | | | | | | |
| | J-R Lisnard | 7 | 6 | | | J-R Lisnard | 6$^5$ | 6$^6$ | | | | | | | | | | | | | | | |
| Q | G Müller | 5 | 4 | | | | | | | | M Kratochvil | 5 | 2 | | | | | | | | | | |
| Q | M Dell'Acqua | 6$^6$ | 6$^4$ | | | | | | | 3 | K Kučera | 7 | 6 | | | | | | | | | | |
| | M Rosset | 7$^8$ | 7$^7$ | | | M Rosset | 6$^5$ | 3 | | | | | | | | | | | | | | | |
| | K Vliegen | 2 | 3 | | 3 | K Kučera | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| 3 | K Kučera | 6 | 6 | | | | | | | | | | | | 3 | K Kučera | 6 | 6 | | | | | |
| 8 | R Sluiter | 6$^4$ | 5 | | | | | | | | | | | | 2 | W Arthurs | 2 | 4 | | | | | |
| | M Norman | 7$^7$ | 7 | | | M Norman | 6 | 7$^8$ | | | | | | | | | | | | | | | |
| | C Mamiit | 2 | 0 | | | K Pless | 4 | 6$^6$ | | | | | | | | | | | | | | | |
| | K Pless | 6 | 6 | | | | | | | | M Norman | 7$^9$ | 5 | 4 | | | | | | | | | |
| | B Vahaly | 4 | 4 | | | | | | | 2 | W Arthurs | 6$^7$ | 7 | 6 | | | | | | | | | |
| WC | A Vinciguerra | 6 | 6 | | WC | A Vinciguerra | 7$^7$ | 4 | 6$^6$ | | | | | | | | | | | | | | |
| | O Mutis | 6$^5$ | 2 | | 2 | W Arthurs | 6$^4$ | 6 | 7$^8$ | | | | | | | | | | | | | | |
| 2 | W Arthurs | 7$^7$ | 6 | | | | | | | | | | | | | | | | | | | | |