The 2010 Legg Mason Tennis Classic was a tennis tournament played on outdoor hard courts. It was the 42nd edition of this event and was part of the ATP World Tour 500 series of the 2010 ATP World Tour. It took place at the William H.G. FitzGerald Tennis Center in Washington, D.C., USA, from August 1 through August 8, 2010. Unseeded David Nalbandian, who entered the main draw on a wildcard, won the singles title.

ATP entrants

List of Association of Tennis Professionals (ATP) singles entrants, as of July 26, 2010.

Seeds

Other entrants

The following players received wildcards into the singles main draw The following players received entry from the qualifying draw:

Finals

Singles

🇦🇷 David Nalbandian defeated 🇨🇾 Marcos Baghdatis, 6–2, 7–6(7–4)

Doubles

🇺🇸 Mardy Fish / Mark Knowles defeated 🇨🇿 Tomáš Berdych / 🇨🇿 Radek Štěpánek, 4–6, 7–6(9–7), [10–7]