Roddick suffered a partial tear of an abdominal muscle on his right side in practice. He joins four other marquee players in missing the Lagardere Unlimited owned tournament; fellow former world no.1 Lleyton Hewitt, American Davis Cup team-mate Sam Querrey, Canadian Milos Raonic and Japan's Kei Nishikori.
Doctors confirmed Roddick is suffering a Grade 2 strain or a partial tear of the oblique abdominal muscle on his right side. In May the 28 year-old pulled out of the French Open in May with a right shoulder injury.
Currently ranked 12th on the ATP World Tour rankings, Roddick has been
inactive in tournament play since losing in Wimbledon’s second round to
Feliciano Lopez more than a month ago. His last on court appearance was a
losing Davis Cup effort against Spain in his home town of Austin, Texas when he lost in straight sets to David Ferrer.
Jeff Newman, Legg Mason Classic tournament director said: "Make no mistake; it's disappointing to lose a player of Andy's caliber, especially in light of his success and many years of participation throughout his career here in DC. He is a great competitor and we hope he recovers quickly and is back competing very soon."
Roddick was as a teenager when he won his first Legg Mason title held at William H.G. FitzGerald Tennis Center in Rock Creek Park in 2001, beating Holland’s Sjeng Schalken in the final . He also won in 2005 and 2007 with final wins over fellow Americans James Blake and John Isner.
A year ago he was beaten in the third round by Frenchman Gilles Simon but then received the results of blood tests which showed he had been suffering from mononucleosis for several months.