2004 U.S. Men's Clay Court Championships – Singles

Andre Agassi was the defending champion but did not compete that year.

Tommy Haas won in the final 6–3, 6–4 against Andy Roddick.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1) 🇺🇸 Andy Roddick (final)
 * 2) 🇺🇸 Mardy Fish (first round)
 * 3) 🇺🇸 Taylor Dent (first round)
 * 4) 🇺🇸 James Blake (quarterfinals)
 * 5)  Andrei Pavel (semifinals)
 * 6) 🇺🇸 Robby Ginepri (first round)
 * 7) 🇵🇪 Luis Horna (semifinals)
 * 8) 🇦🇹 Jürgen Melzer (quarterfinals)