Official Websites Of Tennis Organizations:

ATP Tour
Australian Open - Official Site by IBM
Roland Garros - Official Site by IBM
Wimbledon by IBM, Official Site of The Championships
US Open - Grand Slam Tennis - Official Site by IBM
Davis Cup - Official Website
Masters Series - Official site

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Associated Press
Reuters

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Tennis Websites:

Tennis - CBS.SportsLine.com
ESPN.com - Tennis
Yahoo! Sports: Tennis
Excite Sports: Tennis
FOXSports.com - Tennis

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Russian Tennis Websites:

Sports.ru
Sport.rbc.ru
Sport-express.ru
Tennis-russia.ru