United States' Venus Williams, left, and Serena Williams, right, play the the women's doubles semifinal match against Maria Kirilenko and Nadia Petrova, of Russia, at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Saturday, Aug. 4, 2012. (AP Photo/Elise Amendola)
United States' Venus Williams, left, and Serena Williams, right, play the the women's doubles semifinal match against Maria Kirilenko and Nadia Petrova, of Russia, at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Saturday, Aug. 4, 2012. (AP Photo/Elise Amendola)
