# 2003 International Raiffeisen Grand Prix – Singles

Nicolás Lapentti was the defending champion but did not compete that year.
Andy Roddick won in the final 6–3, 6–2 against Nikolay Davydenko.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Andy Roddick (champion)
* Albert Costa (second round)
* Guillermo Coria (withdrew because of a groin muscle injury)
* Taylor Dent (first round)
* Jan-Michael Gambill (first round)
* Nikolay Davydenko (final)
* Karol Kučera (first round)
* David Sánchez (semifinals, retired because of a foot blister)

## 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 | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | A Roddick | 6 | 7$^7$ | | | | | | | | | | | | | | | | | | |
| | A Martín | 1 | 6$^5$ | | 1 | A Roddick | 6 | 6 | | | | | | | | | | | | | |
| Q | P Kohlschreiber | 6 | 0 | 6 | Q | P Kohlschreiber | 3 | 4 | | | | | | | | | | | | | |
| WC | J Melzer | 4 | 6 | 2 | | | | | | 1 | A Roddick | 7 | 6 | | | | | | | | |
| | K Carlsen | 5 | 7 | 3 | | | | | | WC | R Krajicek | 5 | 1 | | | | | | | | |
| | B Vahaly | 7 | 5 | 6 | | B Vahaly | 2 | 6 | 3 | | | | | | | | | | | | |
| WC | R Krajicek | 7 | 3 | 6 | WC | R Krajicek | 6 | 2 | 6 | | | | | | | | | | | | |
| 5 | J-M Gambill | 5 | 6 | 3 | | | | | | | | | | 1 | A Roddick | 6 | 2 | | | | |
| 4 | T Dent | 6 | 6$^3$ | 4 | | | | | | | | | | 8 | D Sánchez | 2 | 0$^r$ | | | | |
| | M Ančić | 2 | 7$^7$ | 6 | | M Ančić | 6 | 7 | | | | | | | | | | | | | |
| | J-R Lisnard | 6 | 6 | | | J-R Lisnard | 4 | 5 | | | | | | | | | | | | | |
| | M Kratochvil | 3 | 4 | | | | | | | | M Ančić | 1 | 4 | | | | | | | | |
| | D Sanguinetti | 7 | 7$^7$ | | | | | | | 8 | D Sánchez | 6 | 6 | | | | | | | | |
| | S Sargsian | 5 | 6$^5$ | | | D Sanguinetti | 4 | 4 | | | | | | | | | | | | | |
| WC | M Hipfl | 1 | 0 | | 8 | D Sánchez | 6 | 6 | | | | | | | | | | | | | |
| 8 | D Sánchez | 6 | 6 | | | | | | | | | | | | | | | 1 | Andy Roddick | 6 | 6 |
| 7 | K Kučera | 2 | 1 | | | | | | | | | | | | | | | 6 | Nikolay Davydenko | 3 | 2 |
| | M Verkerk | 6 | 6 | | | M Verkerk | 6 | 7 | | | | | | | | | | | | | |
| | D Hrbatý | 6 | 7 | | | D Hrbatý | 4 | 5 | | | | | | | | | | | | | |
| | L Horna | 3 | 5 | | | | | | | | M Verkerk | 7$^7$ | 7$^7$ | | | | | | | | |
| | F Saretta | 6 | 6 | | | | | | | | F Saretta | 6$^4$ | 6$^2$ | | | | | | | | |
| | A Sá | 2 | 2 | | | F Saretta | 6 | 6 | | | | | | | | | | | | | |
| Q | I Labadze | 6 | 4 | 6 | Q | I Labadze | 1 | 1 | | | | | | | | | | | | | |
| LL | J Weinzierl | 4 | 6 | 4 | | | | | | | | | | | M Verkerk | 5 | 1 | | | | |
| 6 | N Davydenko | 6 | 6 | | | | | | | | | | | 6 | N Davydenko | 7 | 6 | | | | |
| | K Beck | 4 | 2 | | 6 | N Davydenko | 6 | 6 | | | | | | | | | | | | | |
| Q | H Armando | 6 | 4 | 3 | | H-T Lee | 4 | 3 | | | | | | | | | | | | | |
| | H-T Lee | 4 | 6 | 6 | | | | | | 6 | N Davydenko | 7 | 6 | | | | | | | | |
| | O Mutis | 3 | 1 | | | | | | | | A Dupuis | 5 | 1 | | | | | | | | |
| | A Dupuis | 6 | 6 | | | A Dupuis | 6 | 2 | 6 | | | | | | | | | | | | |
| Q | N Zimonjić | 7$^7$ | 1 | 3 | 2 | A Costa | 4 | 6 | 2 | | | | | | | | | | | | |
| 2 | A Costa | 6$^4$ | 6 | 6 | | | | | | | | | | | | | | | | | |