Davis Cup - http://www.daviscup.com/
Annual International team tennis tournament for men. Includes information on players and groups, draws and results, ranking, ties, news and event history.
My Tennis Lounge - http://www.mytennislounge.com/
A place where tennis fans can talk about the game.
United States Tennis Association - http://www.usta.com/
The national governing body for the sport of tennis and the recognized leader in promoting and developing the sport’s growth on every level in the United States.