2004 RCA Championships – Singles

Andy Roddick was the defending champion and successfully defended his title, defeating Nicolas Kiefer, 6–2, 6–3 in the final.

Seeds
• # 🇺🇸 Andy Roddick (champion)

• # 🇺🇸 Andre Agassi (withdrew due to a scheduling conflict)

• # 🇫🇷 Sébastien Grosjean (quarterfinals)

• # 🇹🇭 Paradorn Srichaphan (quarterfinals)

• # 🇺🇸 Mardy Fish (second round)

• # 🇸🇰 Dominik Hrbatý (quarterfinals)

• # Sjeng Schalken (second round)

• # 🇺🇸 Vincent Spadea (withdrew due to a back injury)

• # 🇺🇸 Taylor Dent (withdrew due to a virus)

• # Ivan Ljubičić (semifinals)

• # 🇸🇪 Joachim Johansson (third round)

• # 🇩🇪 Nicolas Kiefer (final)

• # 🇧🇾 Max Mirnyi (second round)

• # 🇧🇪 Xavier Malisse (third round)

• # 🇺🇸 Robby Ginepri (third round)

• # 🇸🇪 Robin Söderling (second round)

• # 🇸🇪 Thomas Enqvist (second round)