Founded in 2008 and based in Washington, D.C., the Kastles won the WTT championship six times, tied for a league record.

From 2014 to 2018, the Kastles played indoors at George Washington University's Charles E. Smith Center at 22nd and G Streets NW.

It was the first time a Washington professional sports team posted an undefeated regular season and also won its league championship.

The Kastles won their 2013 season opener against the New York Sportimes, 23–15, notching their 33rd consecutive victory and equaling the winning streak of the NBA's 1971–72 Los Angeles Lakers.

In their next match, they beat the Boston Lobsters, 25–12, a 34th victory that set the U.S. record for a winning streak by a major professional sports team.

Martina Hingis was not with the team for the back-to-back losses due to her induction into the International Tennis Hall of Fame.

The 2016 Rio Summer Olympics took place during the 2016 World TeamTennis season and many teams had multiple players attend the event.

The Kastles were no exception with Leander Paes, Anastasia Rodionova, Martina Hingis and Venus Williams attending the Olympics.

On March 13, 2017, it was announced that Mark Ein and Fred Luddy (owner of the San Diego Aviators) had purchased Billie Jean King's majority ownership of the WTT.

King will retain a minority stake in WTT and continue as majority owner of the Philadelphia Freedoms franchise.

Mark Ein will become Chairman of World Team Tennis and Ilana Kloss will remain as CEO and Commissioner through 2017.

The Kastles drafted Frances Tiafoe, Nick Kyrgios, Venus Williams, Bruno Soares, Ooshihito Mishioka, Marta Kostyuk and Lyudmyla Kichenok.

Jensen and his brother, Luke, won the French Open doubles championship in 1993 and hosts a show on the Tennis Channel.