# 2003 Croatia Open – Singles

Carlos Moyá was the defending champion and won in the final 6–4, 3–6, 7–5 against Filippo Volandri.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Carlos Moyá (champion)
* Fernando González (quarterfinals)
* n/a
* Olivier Rochus (first round)
* Fernando Vicente (first round)
* Rafael Nadal (semifinals)
* Filippo Volandri (final)
* David Ferrer (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 | Final | Final | Final | Final | Final |
| 1 | C Moyá | 7$^7$ | 6 | | | | | | | | | | | | | | | | | | | | |
| | J Vaněk | 6$^1$ | 4 | | 1 | C Moyá | 6 | 6 | | | | | | | | | | | | | | | |
| | F Browne | 7$^{12}$ | 6 | | | F Browne | 2 | 4 | | | | | | | | | | | | | | | |
| | Ž Krajan | 6$^{10}$ | 2 | | | | | | | 1 | C Moyá | 6 | 6 | | | | | | | | | | |
| | J-R Lisnard | 6 | 6 | | | | | | | 8 | D Ferrer | 1 | 2 | | | | | | | | | | |
| | J Knowle | 4 | 3 | | | J-R Lisnard | 3 | 6 | 5 | | | | | | | | | | | | | | |
| | H Arazi | 0 | 1 | r | 8 | D Ferrer | 6 | 4 | 7 | | | | | | | | | | | | | | |
| 8 | D Ferrer | 6 | 3 | | | | | | | | | | | | 1 | C Moyá | 6 | 6 | | | | | |
| LL | S Tuksar | 7 | | | | | | | | | | | | | 6 | R Nadal | 4 | 4 | | | | | |
| | A Montañés | 5 | r | | LL | S Tuksar | 6$^8$ | 6$^3$ | | | | | | | | | | | | | | | |
| | M Norman | 4 | 6 | 7 | | M Norman | 7$^{10}$ | 7$^7$ | | | | | | | | | | | | | | | |
| | R Ramírez Hidalgo | 6 | 3 | 5 | | | | | | | M Norman | 3 | 4 | | | | | | | | | | |
| | M Puerta | 6 | 7 | | | | | | | 6 | R Nadal | 6 | 6 | | | | | | | | | | |
| Q | J A Marín | 3 | 5 | | | M Puerta | 2 | 4 | | | | | | | | | | | | | | | |
| | A Voinea | 3 | 0 | r | 6 | R Nadal | 6 | 6 | | | | | | | | | | | | | | | |
| 6 | R Nadal | 6 | 1 | | | | | | | | | | | | | | | | 1 | Carlos Moyá | 6 | 3 | 7 |
| 5 | F Vicente | 3 | 0 | | | | | | | | | | | | | | | | 7 | Filippo Volandri | 4 | 6 | 5 |
| | D Hrbatý | 6 | 6 | | | D Hrbatý | 7$^7$ | 7$^7$ | | | | | | | | | | | | | | | |
| WC | M Radić | 1 | 6 | 6 | WC | M Radić | 6$^3$ | 6$^4$ | | | | | | | | | | | | | | | |
| | G Galimberti | 6 | 4 | 4 | | | | | | | D Hrbatý | 7 | 6 | | | | | | | | | | |
| | C Rochus | 5 | 4 | | | | | | | | A Martín | 5 | 2 | | | | | | | | | | |
| WC | I Karlović | 7 | 6 | | WC | I Karlović | 6 | 3 | 6$^2$ | | | | | | | | | | | | | | |
| | A Martín | 6 | 6 | | | A Martín | 2 | 6 | 7$^7$ | | | | | | | | | | | | | | |
| 4 | O Rochus | 3 | 2 | | | | | | | | | | | | | D Hrbatý | 6$^6$ | 1 | | | | | |
| 7 | F Volandri | 6 | 6 | | | | | | | | | | | | 7 | F Volandri | 7$^8$ | 6 | | | | | |
| | A Sávolt | 3 | 0 | | 7 | F Volandri | 6 | 6 | | | | | | | | | | | | | | | |
| WC | S Wawrinka | 6 | 6 | | WC | S Wawrinka | 4 | 3 | | | | | | | | | | | | | | | |
| Q | R Karanušić | 4 | 4 | | | | | | | 7 | F Volandri | 4 | 6 | 7$^7$ | | | | | | | | | |
| | K Vliegen | 6 | 2 | 6 | | | | | | 2 | F González | 6 | 2 | 6$^4$ | | | | | | | | | |
| Q | M Mertiňák | 0 | 6 | 3 | | K Vliegen | 0 | r | | | | | | | | | | | | | | | |
| Q | L Zovko | 4 | 4 | | 2 | F González | 3 | | | | | | | | | | | | | | | | |
| 2 | F González | 6 | 6 | | | | | | | | | | | | | | | | | | | | |