serenavenus

Serena Williams will play doubles with sister Venus, but not mixed doubles. (Clive Brunskill -- Getty Images)

Serena Williams will play doubles with sister Venus, but not mixed doubles. (Clive Brunskill — Getty Images)

LONDON, ENGLAND – JULY 30: Venus Williams and Serena Williams of the United States in action during their Women’s Doubles Tennis match against Sorana Cirstea and Simona Halep of Romania on Day 3 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club in Wimbledon on July 30, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)