# 2003 Idea Prokom Open – Men's singles

José Acasuso was the defending champion but did not compete that year.
Guillermo Coria won in the final 7–5, 6–1 against David Ferrer.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Juan Carlos Ferrero (quarterfinals)
* Carlos Moyá (first round)
* Guillermo Coria (champion)
* David Nalbandian (second round)
* Filippo Volandri (first round)
* David Sánchez (second round)
* Dominik Hrbatý (second round)
* Olivier Mutis (quarterfinals)

## 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 C Ferrero | 6 | 6 | | | | | | | | | | | | | | | | | | | | |
| WC | B Dąbrowski | 3 | 1 | | 1 | J C Ferrero | 4 | 7 | 6 | | | | | | | | | | | | | | |
| Q | F Čermák | 6 | 6 | | Q | F Čermák | 6 | 5 | 2 | | | | | | | | | | | | | | |
| Q | F Urban | 4 | 2 | | | | | | | 1 | J C Ferrero | 1 | 6$^1$ | | | | | | | | | | |
| | A Sávolt | 1 | 1 | | | | | | | | L Horna | 6 | 7$^7$ | | | | | | | | | | |
| | L Horna | 6 | 6 | | | L Horna | 6 | 6 | | | | | | | | | | | | | | | |
| WC | M Fyrstenberg | 5 | 3 | | 7 | D Hrbatý | 3 | 1 | | | | | | | | | | | | | | | |
| 7 | D Hrbatý | 7 | 6 | | | | | | | | | | | | | L Horna | 2 | 2 | | | | | |
| 3 | G Coria | 6 | 6 | | | | | | | | | | | | 3 | G Coria | 6 | 6 | | | | | |
| | V Hănescu | 3 | 4 | | 3 | G Coria | 6 | 6 | | | | | | | | | | | | | | | |
| | C Rochus | 6 | 6 | | | C Rochus | 1 | 0 | | | | | | | | | | | | | | | |
| | F Browne | 3 | 3 | | | | | | | 3 | G Coria | 6 | 6 | | | | | | | | | | |
| Q | M-K Goellner | 6 | 4 | 6 | | | | | | 8 | O Mutis | 3 | 4 | | | | | | | | | | |
| | M Kratochvil | 4 | 6 | 3 | Q | M-K Goellner | 4 | 2 | | | | | | | | | | | | | | | |
| | A Voinea | 2 | 4 | | 8 | O Mutis | 6 | 6 | | | | | | | | | | | | | | | |
| 8 | O Mutis | 6 | 6 | | | | | | | | | | | | | | | | | 3 | Guillermo Coria | 7 | 6 |
| 6 | D Sánchez | 6 | 6 | | | | | | | | | | | | | | | | | | David Ferrer | 5 | 1 |
| | M Norman | 4 | 2 | | 6 | D Sánchez | 3 | 4 | | | | | | | | | | | | | | | |
| | G Galimberti | 3 | 2 | | | A Vinciguerra | 6 | 6 | | | | | | | | | | | | | | | |
| | A Vinciguerra | 6 | 6 | | | | | | | | A Vinciguerra | 1 | 2 | | | | | | | | | | |
| Q | B Ulihrach | 6$^2$ | 2 | | | | | | | | D Ferrer | 6 | 6 | | | | | | | | | | |
| | D Ferrer | 7$^7$ | 6 | | | D Ferrer | 6 | 4 | 6 | | | | | | | | | | | | | | |
| | M Rosset | 2 | 4 | | 4 | D Nalbandian | 4 | 6 | 3 | | | | | | | | | | | | | | |
| 4 | D Nalbandian | 6 | 6 | | | | | | | | | | | | | D Ferrer | 6$^2$ | 6 | 6 | | | | |
| 5 | F Volandri | 4 | 0 | | | | | | | | | | | | | R Ramírez Hidalgo | 7$^7$ | 3 | 4 | | | | |
| | M Puerta | 6 | 6 | | | M Puerta | 3 | 3 | | | | | | | | | | | | | | | |
| | R Ramírez Hidalgo | 7 | 3 | 6 | | R Ramírez Hidalgo | 6 | 6 | | | | | | | | | | | | | | | |
| | J Knowle | 5 | 6 | 1 | | | | | | | R Ramírez Hidalgo | 6$^7$ | 6 | 6 | | | | | | | | | |
| WC | M Matkowski | 0 | 1 | | | | | | | | G Blanco | 7$^9$ | 4 | 0 | | | | | | | | | |
| | G Blanco | 6 | 6 | | | G Blanco | 3 | 6 | 6 | | | | | | | | | | | | | | |
| | A Portas | 7$^7$ | 6$^6$ | 7 | | A Portas | 6 | 1 | 4 | | | | | | | | | | | | | | |
| 2 | C Moyá | 6$^4$ | 7$^8$ | 5 | | | | | | | | | | | | | | | | | | | |