2004 Croatia Open – Singles
| Singles | |
|---|---|
| 2004 Croatia Open | |
| Champion | Guillermo Cañas |
| Runner-up | Filippo Volandri |
| Score | 7–5, 6–3 |
| Draw | 32 (4 Q / 3 WC ) |
| Seeds | 8 |
Guillermo Cañas defeated Filippo Volandri 7–5, 6–3 to win the singles title at the 2004 Croatia Open.
Carlos Moyá was the defending champion, but lost in the semifinals to Volandri.
This tournament marked the ATP Tour debut of future 24-time major champion and world No. 1 Novak Djokovic. He lost in the first round to Volandri after qualifying for the main draw.