2004 BMW Open – Singles

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

Nikolay Davydenko won in the final 6–4, 7–5 against Martin Verkerk.

Seeds

 * 1) 🇩🇪 Rainer Schüttler (quarterfinals)
 * 2) 🇹🇭 Paradorn Srichaphan (first round)
 * 3) 🇨🇿 Jiří Novák (second round)
 * 4)  Martin Verkerk (final)
 * 5) 🇺🇸 Vince Spadea (second round)
 * 6)  Andrei Pavel (first round)
 * 7) 🇺🇸 Taylor Dent (second round)
 * 8) 🇺🇸 James Blake (first round)