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.


 * 1) 🇪🇸 Carlos Moyá (champion)
 * 2)  Fernando González (quarterfinals)
 * 3) n/a
 * 4) 🇧🇪 Olivier Rochus (first round)
 * 5) 🇪🇸 Fernando Vicente (first round)
 * 6) 🇪🇸 Rafael Nadal (semifinals)
 * 7) 🇮🇹 Filippo Volandri (final)
 * 8) 🇪🇸 David Ferrer (quarterfinals)