Croatia Open Umag 2004
Guillermo Canas won the title, beating Filippo Volandri 7–5 6–3 in the final.
Main draw 32 players
- 1🇪🇸Carlos MoyaSemifinals · Lost to Filippo Volandri
- 2🇨🇿Jiri NovakQuarterfinals · Lost to Guillermo Garcia Lopez
- 3🇷🇺Igor AndreevRound of 32 · Lost to Tomas Zib
- 4🇮🇹Filippo VolandriFinal · Lost to Guillermo Canas
- 5🇪🇸Alberto Martin#364Quarterfinals · Lost to Carlos Moya
- 6🇦🇷Guillermo CanasFinal · Champion
- 7🇧🇷Flavio SarettaRound of 16 · Lost to Guillermo Garcia Lopez
- 8🇸🇰Karol KuceraRound of 32 · Lost to Olivier Rochus
- 🇪🇸Guillermo Garcia LopezSemifinals · Lost to Guillermo Canas
- 🇪🇸Alex CalatravaQuarterfinals · Lost to Guillermo Canas
- 🇧🇪Kristof VliegenQuarterfinals · Lost to Filippo Volandri
- 🇧🇪Christophe RochusRound of 16 · Lost to Jiri Novak
- WC🇪🇸Fernando VicenteRound of 16 · Lost to Guillermo Canas
- Q🇫🇷Florent SerraRound of 16 · Lost to Filippo Volandri
- 🇪🇸Nicolas AlmagroRound of 16 · Lost to Alberto Martin
- 🇧🇪Olivier RochusRound of 16 · Lost to Kristof Vliegen
- 🇨🇿Tomas ZibRound of 16 · Lost to Alex Calatrava
- WC🇭🇷Zeljko KrajanRound of 16 · Lost to Carlos Moya
- 🇫🇷Arnaud Di PasqualeRound of 32 · Lost to Alex Calatrava
- 🇨🇿Bohdan UlihrachRound of 32 · Lost to Florent Serra
- 🇫🇷Jerome GolmardRound of 32 · Lost to Alberto Martin
- 🇨🇿Jiri VanekRound of 32 · Lost to Zeljko Krajan
- 🇦🇷Jose AcasusoRound of 32 · Lost to Christophe Rochus
- Q🇷🇸Novak Djokovic#12Round of 32 · Lost to Filippo Volandri
- 🇫🇷Olivier MutisRound of 32 · Lost to Kristof Vliegen
- 🇫🇷Olivier PatienceRound of 32 · Lost to Guillermo Canas
- WC🇭🇷Roko KaranusicRound of 32 · Lost to Carlos Moya
- 🇪🇸Ruben Ramirez HidalgoRound of 32 · Lost to Jiri Novak
- Q🇭🇷Sasa TuksarRound of 32 · Lost to Fernando Vicente
- Q🇨🇭Stan Wawrinka#164Round of 32 · Lost to Flavio Saretta
- 🇩🇪Tomas BehrendRound of 32 · Lost to Nicolas Almagro
- 🇷🇴Victor HanescuRound of 32 · Lost to Guillermo Garcia Lopez