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)