2004 Idea Prokom Open – Men's singles

Rafael Nadal defeated José Acasuso in the final, 6–3, 6–4 to win the Singles title at the 2004 Idea Prokom Open. It was his first career title.

Guillermo Coria was the reigning champion, but did not participate.

Seeds
• # 🇷🇺 Marat Safin (second round)

• # 🇷🇺 Nikolay Davydenko (first round)

• # 🇪🇸 David Ferrer (second round)

• # 🇷🇺 Igor Andreev (first round)

• # 🇪🇸 Alberto Martín (first round)

• # 🇪🇸 Rafael Nadal (champion)

• # 🇪🇸 Albert Montañés (first round)

• # 🇫🇷 Paul-Henri Mathieu (first round)