The Washington Kastles, a professional tennis team based in Washington, D.C., are a franchise of the World TeamTennis Pro League and the 2009 WTT Champions. The Kastles entered the World TeamTennis League in 2008 and are owned by Mark Ein. The team is named for Kastle Systems, a security company. The Kastles captured the 2009 King Trophy by defeating Springfield in the WTT Championship on Sunday, July 26, 2009 in Washington, DC. They also captured the 2011 King Trophy by defeating St. Louis in the WTT Championship on Sunday, July 24, 2011 in Charleston, SC.

From 2008 to 2010, the team played its home matches at Kastles Stadium, a temporary outdoor stadium erected each summer in a parking lot on the site of the former Washington Convention Center. In 2011, the team announced its move to the new Kastles Stadium at The Wharf, located on the Southwest Waterfront at 800 Water Street SW, Washington DC 20024. The team played in the new facility in July 2011, and is located near the L'Enfant Plaza (Yellow/Orange/Blue/Green) and Waterfront Metro (Green) stops. Capacity is 2,600.

Venus Ebony Starr Williams (born June 17, 1980), is an American professional tennis player who is a former World No. 1 and is ranked World No. 53 as of May 28, 2012 in singles. She has been ranked World No. 1 in singles by the Women's Tennis Association on three separate occasions. She became the World No. 1 for the first time on February 25, 2002, becoming the first black woman to achieve this feat during the Open Era.

Her 21 Grand Slam titles ties her for twelfth on the all time list and is more than any other active female player except for her younger sister Serena Williams. Venus Williams' titles consist of: seven in singles, twelve in women's doubles, and two in mixed doubles. Those seven Grand Slam singles titles ties her with four other women for twelfth place on the all-time list. Her five Wimbledon singles titles ties her with two other women for eighth place on the all-time list. Venus Williams is one of only three women in the open era to have won five or more Wimbledon singles titles. From the 2000 Wimbledon Championships through the 2001 US Open, Williams won four of the six Grand Slam singles tournaments held. She is one of only five women in the open era to win 200 or more main draw Grand Slam singles matches.

Martina Hingis (born 30 September 1980) is a retired Swiss professional tennis player who spent a total of 209 weeks as World No. 1. She won five Grand Slam singles titles (three Australian Opens, one Wimbledon, and one US Open). She also won nine Grand Slam women's doubles titles, winning a calendar year doubles Grand Slam in 1998, and one Grand Slam mixed doubles title.

Hingis set a series of "youngest-ever" records before ligament injuries in both ankles forced her to withdraw temporarily from professional tennis in 2002 at the age of 22. After several surgeries and long recuperations, Hingis returned to the WTA tour in 2006. She then climbed to world number 6 and won three singles titles. On 1 November 2007, Hingis announced her retirement from tennis after testing positive for cocaine during Wimbledon in 2007. She denied using the drug, but decided not to appeal the imminent ban.

In June 2011, she was named one of the "30 Legends of Women's Tennis: Past, Present and Future" by Time.

Hingis was born in Košice, (then part of Czechoslovakia, now in modern Slovakia), to accomplished tennis players Melanie Molitorová and Karol Hingis. Molitorová was a professional tennis player, who was once ranked tenth among women in Czechoslovakia, and was determined to develop Hingis into a top player as early as pregnancy. Her father was ranked as high as nineteenth in the Czechoslovakian tennis rankings. Hingis's parents divorced when she was six, and she and her mother relocated around a year later to Trübbach in Switzerland. Her father, who continued to live in Košice as a tennis coach, said in 1997 that he had seen little of his daughter after the split.

Angela Haynes (born September 27, 1984 in Bellflower, California) is a professional tennis player from the United States. Haynes's top WTA singles ranking is World No. 95 which she attained in August, 2005. Angela is currently ranked World No. 158, race-singles World No. 260 and World No. 198 in doubles as of March 8, 2010.

Haynes' brother, Dontia Haynes, a former San Diego State University tennis player ranked among the top 100 ranked collegiate tennis players in the United States, died 23 September 2005.

Angela's clothing is provided by Adidas. Her racquets are provided by Babolat. Angela's current racquet is believed to be the Babolat Pure Storm. Angela likes to wear bandanas while playing.

Angela appears in Top Spin 2 which is for the Xbox 360, Nintendo Game Boy, and Nintendo DS.

Murphy Jensen (born October 30, 1968) is an American professional tennis player from Ludington, Michigan, and currently the coach of the Washington Kastles of World TeamTennis. His elder brother is former professional tennis player Luke Jensen. Jensen has a son William (born 1999) with actress Robin Givens, whom he dated periodically during the late 1990s.

Jensen and his brother attended the University of Southern California in Los Angeles, California.

Jensen was unheard of until 1993 when he and his brother, Luke Jensen, won the men's doubles title at the French Open.

Since retiring from the game, Jensen has acted in bit parts in films such as Wimbledon and more recently Tennis, Anyone. He currently hosts several programs on the Tennis Channel, including Open Access and Murphy's Guide.

On Open Access Jensen reports on high-profile tennis events around the world and interviews participating players about their lives and careers.

Each episode of the more comedic Murphy's Guide is a guide for tourists to a particular city where a major tennis tournament is taking place, such as Paris, London, New York, Melbourne etc. At least one major player appears at some point in the episode, and there is usually a brief segment about where enthusiasts of the game can play when in town, but the show's content mainly features Jensen attempting to navigate the city's sights, trying exotic food, and interacting with locals in his unique style. Through his experiences and misadventures, however, specific travel information about local hotels, restaurants, and attractions is conveyed, often with the help of animated maps and graphics. Many episodes also feature a scripted opening sequence, such as Jensen being made to walk the plank by the pirates of Treasure Island in Las Vegas, being psychoanalyzed by Sigmund Freud in Vienna, and impersonating James Bond and Crocodile Dundee in London and Melbourne, respectively.