Defending champion Rafael Nadal shocked the US Open on Sunday when he collapsed in an agony of cramps during a news conference while 2009 champion Juan Martin del Potro suffered a painful, error-strewn exit. | Minutes before she was due to play her second-round match at the U.S. Open, Venus Williams withdrew from the tournament due to an autoimmune disease with which she was recently diagnosed. | Serbian tennis star Novak Djokovic hasn't earned his No. 1 ranking by taking the conventional road. There's his odd ritual of excessive ball bouncing before serves, which can break an opponent's concentration. There's his new gluten-free diet, which he's sa... | Wimbledon hopeful Simona Halep wants surgery to reduce the size of her breasts. After winning a host of junior titles and a place in the finals of the junior French Open last year, Halep is seen as one of the tennis stars of the future. But, the 5-foot-5-in... | Maria Sharapova got 2010 off on the right foot on Saturday with victory over Venus Williams in an exhibition match in Thailand. | Andre Agassi, the former Wimbledon champion, has admitted the long lion-mane hairstyle he wore during the 1990s was actually a wig. | Eight times grand slam winner Andre Agassi has admitted using the recreational drug crystal meth and lying to men's governing body the ATP to escape a ban. | Serena Williams was in the process of getting her behind kicked by Samantha Stosur on Sunday when she found herself living a surreal John McEnroe moment. |