Co-founded by Arthur Ashe, Donald Dell, and John A. Harris, the Mubadala Citi DC Open in Washington, DC, is one of the oldest and most prestigious tournaments in tennis and is the only combined ATP & WTA 500 tournament in the world. Held annually in Rock Creek Park since its founding, the Mubadala Citi DC Open is also the longest-running pro tennis event to be held in an equal-access public park. American Andre Agassi holds the record for most titles in the US capital, winning five (1990-91, 1995, 1998-99.) Past champions also include Ken Rosewall, Jimmy Connors, Chris Evert, Martina Navratilova, Ivan Lendl, Yannick Noah, Monica Selles, Martina Hingis, Andy Roddick, Kim Clijsters, Venus and Serena Williams, and many more.