The Citi Open is a professional tennis tournament held annually in Washington, D.C. It is part of the ATP Tour and WTA Tour, featuring both men's and women's competitions. The event typically takes place in early August and attracts top players from around the world, offering a mix of singles and doubles matches. Founded in 1969, the Citi Open is one of the oldest tennis tournaments in the United States. It is played on outdoor hard courts at the Rock Creek Park Tennis Center, providing a vibrant atmosphere for fans and players alike. The tournament serves as a key preparation event for the US Open.