<P> Washington is home to two annual marathon races: the Marine Corps Marathon which is held every autumn and the Rock' n' Roll USA Marathon held in the spring . The Marine Corps Marathon begun in 1976 is sometimes called "The People's Marathon" because it is the largest marathon without prize money . The Cherry Blossom 10 - Mile Run is another annual race that began in 1973 and is conducted as part of the National Cherry Blossom Festival . The Army Ten - Miler, started in 1985, is the country's largest ten - mile race with over 26,000 participants; it is held each October and its course runs through Washington, D.C. and finishes at the Pentagon . </P> <P> Washington hosts an annual ATP Tour men's tennis event, the Legg Mason Tennis Classic at the William H.G. FitzGerald Tennis Center in Rock Creek Park . </P> <P> In July 2008, the Washington Kastles, a World TeamTennis team, played their first season in a temporary stadium in downtown Washington, D.C. finishing with a 6--8 record . In 2009, despite losing their first four matches, the Kastles won the WTT championship . The Kastles were 8--6 and just missed the playoffs in 2010 . In 2011, the Kastles moved to Kastles Stadium at the Wharf at 800 Water Street, SW in Washington right off Maine Avenue . The Kastles played the 2011, 2012 and 2013 seasons there . In 2011, the Kastles posted a perfect season of 16--0 and won the WTT Championship . The 2011 season was the 36th for World Team Tennis, and the Kastles became the first team to accomplish the feat of a perfect season . They posted a second perfect season of 16--0 in 2012, and won another WTT Championship, becoming the only professional sports team to have back - to - back undefeated seasons . In 2013, the Kastles won their first match of the season to post a record of 33 straight wins, equaling the 33 games winning streak of the 1971--72 Los Angeles Lakers of the NBA . The Kastles won the second match of the season to set a new record of 34 straight wins by a top - tier professional sports team . Even though the Kastles lost the third and fourth matches of the 2013 season, they went undefeated for the remainder of the season to finish with a 14--2 record and won their third consecutive WTT Championship . In 2014, the Kastles moved to Kastles Stadium at the Charles E. Smith Center on the campus of George Washington University and won their fourth consecutive WTT Championship with an overall record of 12--4 . In the first seven years of the franchise, the Kastles have won five WTT titles . </P>

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