Croatia Open Umag 2003
Carlos Moya won the title, beating Filippo Volandri 6–4 3–6 7–5 in the final.
Main draw 32 players
- 1🇪🇸Carlos MoyaFinal · Champion
- 2🇨🇱Fernando GonzalezQuarterfinals · Lost to Filippo Volandri
- 4🇧🇪Olivier RochusRound of 32 · Lost to Alberto Martin
- 5🇪🇸Fernando VicenteRound of 32 · Lost to Dominik Hrbaty
- 6🇪🇸Rafael NadalSemifinals · Lost to Carlos Moya
- 7🇮🇹Filippo VolandriFinal · Lost to Carlos Moya
- 8🇪🇸David FerrerQuarterfinals · Lost to Carlos Moya
- 🇸🇰Dominik HrbatySemifinals · Lost to Filippo Volandri
- 🇪🇸Alberto Martin#364Quarterfinals · Lost to Dominik Hrbaty
- 🇸🇪Magnus NormanQuarterfinals · Lost to Rafael Nadal
- 🇦🇷Federico BrowneRound of 16 · Lost to Carlos Moya
- WC🇭🇷Ivo KarlovicRound of 16 · Lost to Alberto Martin
- 🇲🇨Jean Rene LisnardRound of 16 · Lost to David Ferrer
- 🇧🇪Kristof VliegenRound of 16 · Lost to Fernando Gonzalez
- 🇦🇷Mariano PuertaRound of 16 · Lost to Rafael Nadal
- WC🇭🇷Mario RadicRound of 16 · Lost to Dominik Hrbaty
- LL🇭🇷Sasa TuksarRound of 16 · Lost to Magnus Norman
- WC🇨🇭Stan Wawrinka#164Round of 16 · Lost to Filippo Volandri
- 🇷🇴Adrian VoineaRound of 32 · Lost to Rafael Nadal
- 🇪🇸Albert MontanesRound of 32 · Lost to Sasa Tuksar
- 🇭🇺Attila SavoltRound of 32 · Lost to Filippo Volandri
- 🇧🇪Christophe RochusRound of 32 · Lost to Ivo Karlovic
- 🇮🇹Giorgio GalimbertiRound of 32 · Lost to Mario Radic
- 🇲🇦Hicham AraziRound of 32 · Lost to David Ferrer
- 🇨🇿Jiri VanekRound of 32 · Lost to Carlos Moya
- QCRCJuan Antonio MarinRound of 32 · Lost to Mariano Puerta
- 🇦🇹Julian KnowleRound of 32 · Lost to Jean Rene Lisnard
- Q🇭🇷Lovro ZovkoRound of 32 · Lost to Fernando Gonzalez
- Q🇸🇰Michal MertinakRound of 32 · Lost to Kristof Vliegen
- Q🇭🇷Roko KaranusicRound of 32 · Lost to Stan Wawrinka
- 🇪🇸Ruben Ramirez HidalgoRound of 32 · Lost to Magnus Norman
- 🇭🇷Zeljko KrajanRound of 32 · Lost to Federico Browne