See main article: 2011 Legg Mason Tennis Classic. 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.
All seeds received a bye into the second round.
See main article: 2011 Legg Mason Tennis Classic – Singles qualifying.