Roland Garros - The French Open  
   Features live scores and information on the tournament, player statistics, schedule of play, and real-time audio.
   http://www.rolandgarros.com/

grand slam records and statistics  
   A listing of all final round results, and extensive individual and head-to-head records and statistics.
   http://ourworld.cs.com/atomalt/index.htm

US Open  
   Live scores and draws, ticket information, online tournament store, streaming audio and video of interviews, and games.
   http://www.usopen.org/

Australian Open  
   Provides scoreboard, news, photos, players, and tournament information.
   http://www.ausopen.org/

Wimbledon - The All England Lawn Tennis and Croquet Club  
   Information on the club, live scores and draws, video clips from past matches, history of the tournament, and streaming audio of Radio Wimbledon during the tournament.
   http://www.wimbledon.com/