2011 Legg Mason Tennis Classic – Singles

David Nalbandian was the defending champion, but lost to James Blake in the second round.

Radek Štěpánek won the title, defeating Gaël Monfils 6–4, 6–4, in the final.

Seeds
All seeds received a bye into the second round. • # 🇫🇷 Gaël Monfils (final)

• # 🇺🇸 Mardy Fish (withdrew due to a bruised right heel)

• # 🇷🇸 Viktor Troicki (quarterfinals)

• # 🇦🇹 Jürgen Melzer (second round, retired due to left quad injury)

• # 🇪🇸 Fernando Verdasco (quarterfinals)

• # 🇷🇸 Janko Tipsarević (quarterfinals)

• # 🇨🇾 Marcos Baghdatis (quarterfinals)

• # 🇦🇷 David Nalbandian (second round)

• # 🇷🇺 Nikolay Davydenko (third round)

• # 🇫🇷 Michaël Llodra (second round, retired)

• # 🇺🇸 John Isner (semifinals)

• # 🇧🇷 Thomaz Bellucci (third round)

• # Kevin Anderson (third round)

• # 🇧🇪 Xavier Malisse (second round, retired due to right arm injury)

• # 🇷🇺 Dmitry Tursunov (third round)

• # 🇫🇮 Jarkko Nieminen (third round)