2004 Kremlin Cup – Men's singles

The 2004 Kremlin Cup - Men's Singles was a male tennis tournament which took place at the Olympic Stadium in Moscow. Taylor Dent did not return to defend his title from the 2003 Cup. Nikolay Davydenko won in the final 3–6, 6–3, 7–5 against Greg Rusedski. It was Davydenko's 2nd title of the year and 4th title overall.

Seeds
• # 🇷🇺 Marat Safin (second round)

• # 🇸🇪 Joachim Johansson (quarterfinals)

• # 🇸🇰 Dominik Hrbatý (semifinals)

• # 🇺🇸 Vince Spadea (first round)

• # 🇷🇺 Mikhail Youzhny (semifinals)

• # 🇨🇿 Tomáš Berdych (first round)

• # 🇮🇹 Filippo Volandri (second round)

• # 🇷🇺 Nikolay Davydenko (champion)