2004 Legg Mason Tennis Classic – Singles

Tim Henman was the defending champion but chose to participate in the 2004 Summer Olympics.

Lleyton Hewitt won in the final 6–3, 6–4 against Gilles Müller.

Seeds
• # 🇺🇸 Andre Agassi (semifinals)

• # 🇦🇺 Lleyton Hewitt (champion)

• # Sjeng Schalken (first round, retired due to virus)

• # 🇺🇸 Robby Ginepri (semifinals)

• # 🇺🇸 James Blake (first round)

• # 🇪🇸 Alberto Martín (second round)

• # 🇫🇷 Cyril Saulnier (quarterfinals)

• # 🇷🇺 Dmitry Tursunov (second round)