2004 Open 13 – Singles

Roger Federer was the defending champion but did not compete that year.

Dominik Hrbatý won in the final 4–6, 6–4, 6–4 against Robin Söderling.

Seeds

 * 1) 🇪🇸 Juan Carlos Ferrero (first round)
 * 2) 🇦🇷 Guillermo Coria (second round)
 * 3) 🇹🇭 Paradorn Srichaphan (first round)
 * 4) 🇧🇾 Max Mirnyi (quarterfinals)
 * 5)  Fernando González (quarterfinals)
 * 6) 🇪🇸 Albert Costa (second round)
 * 7) 🇫🇷 Arnaud Clément (semifinals)
 * 8) 🇷🇺 Marat Safin (second round)