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Serena and Venus Williams of the United States walk of after they are forced through illness to quit their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00653_Day_Eight_ )

Serena Williams of the United States struggles during the warm up prior her Ladies Doubles second round match with Venus against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00598_Day_Eight_ )

Serena Williams of the United States receives treatment during the warm up before their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00565_Day_Eight_ )

Serena and Venus Williams of the United States walk of after the are forced to through illness to quit their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00562_Day_Eight_ )

Serena and Venus Williams of the United States during their Ladies Doubles second round match against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00573_Day_Eight_ )

Serena and Venus Williams of the United States during their Ladies Doubles second round match against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00567_Day_Eight_ )

Serena Williams prepares to play a return with partner Venus Williams of the U.S in their women's doubles match against Kristina Barrios of Germany and Stefanie Voegele of Switzerland at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 1, 2014. The Williams sisters retired after 3 games. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Chair umpire Kader Nouni talks with Serena and Venus Williams of the United States before the are forced through illness to quit their Ladies Doubles second round match with against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00655_Day_Eight_ )

Serena and Venus Williams of the United States walk of after the are forced to through illness to quit their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00561_Day_Eight_ )

Serena Williams and Venus Williams, left, of the U.S talk during their women's doubles match against Kristina Barrios of Germany and Stefanie Voegele of Switzerland at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 1, 2014. The Williams sisters retired after 3 games. (AP Photo/Pavel Golovkin) ( APTOPIX Britain Wimbledon Tennis )

Serena Williams of the United States struggles during her Ladies Doubles second round match with Venus against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00575_Day_Eight_ )

Serena and Venus Williams of the United States during their Ladies Doubles second round match against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00572_Day_Eight_ )

Serena Williams of the United States recieves treatment during the warm up before their Ladies Doubles second round match with Venus Williams against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00566_Day_Eight_ )

Serena and Venus Williams of the United States during the warm up before their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00577_Day_Eight_ )

Serena and Venus Williams of the United States during the warm up before their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00576_Day_Eight_ )

Serena Williams of the United States struggles during the warm up prior her Ladies Doubles second round match with Venus against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00599_Day_Eight_ )

Chair umpire Kader Nouni talks with Serena and Venus Williams of the United States before the are forced through illness to quit their Ladies Doubles second round match with against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00654_Day_Eight_ )

Serena and Venus Williams of the United States during their Ladies Doubles second round match against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00793_Day_Eight_ )

Serena Williams of the United States struggles during the warm up before her Ladies Doubles second round match with Venus Williams against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00559_Day_Eight_ )

Serena Williams of the United States during her Ladies Doubles second round match with Venus against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00794_Day_Eight_ )

US player Serena Williams (R) wipes her face as she sits talking to the doctor on court after being taken ill during her women's doubles second round match playing with US player Venus Williams (L) against Germany's Kristina Barrois and Switzerland's Stefanie Voegele on day eight of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 1, 2014. US superstar Serena Williams was at the centre of a Wimbledon health scare when she wept and appeared to be close to fainting in a doubles match with sister Venus. Serena, the world number one singles player, called the doctor to Court One just after she and Venus had warmed up for their second round match against Kristina Barrois and Stephanie Voegele. She broke down in tears as she consulted with the doctor and physio before the tournament referee and supervisor were called to court in a reflection of her status in the sport. The Williams sisters retired from the match. (GLYN KIRK/AFP/Getty Images) ( DV1802098 )

Tournament referee Andrew Jarrett (L) and tournament supervisor (R) talk on court after US player Serena Williams is taken ill during her women's doubles second round match playing with US player Venus Williams against Germany's Kristina Barrois and Switzerland's Stefanie Voegele on day eight of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 1, 2014. US superstar Serena Williams was at the centre of a Wimbledon health scare when she wept and appeared to be close to fainting in a doubles match with sister Venus. Serena, the world number one singles player, called the doctor to Court One just after she and Venus had warmed up for their second round match against Kristina Barrois and Stephanie Voegele. She broke down in tears as she consulted with the doctor and physio before the tournament referee and supervisor were called to court in a reflection of her status in the sport. The Williams sisters retired from the match. (GLYN KIRK/AFP/Getty Images) ( DV1802109 )

US player Serena Williams (C) has her temerature taken by the doctor (R) after being taken ill during her women's doubles second round match playing with US player Venus Williams against Germany's Kristina Barrois and Switzerland's Stefanie Voegele on day eight of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 1, 2014. US superstar Serena Williams was at the centre of a Wimbledon health scare when she wept and appeared to be close to fainting in a doubles match with sister Venus. Serena, the world number one singles player, called the doctor to Court One just after she and Venus had warmed up for their second round match against Kristina Barrois and Stephanie Voegele. She broke down in tears as she consulted with the doctor and physio before the tournament referee and supervisor were called to court in a reflection of her status in the sport. The Williams sisters retired from the match. (GLYN KIRK/AFP/Getty Images) ( DV1802131 )

US player Serena Williams warms up shortly before calling for the doctor after being taken ill during her women's doubles second round match playing with her sister Venus Williams against Germany's Kristina Barrois and Switzerland's Stefanie Voegele on day eight of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 1, 2014. US superstar Serena Williams was at the centre of a Wimbledon health scare when she wept and appeared to be close to fainting in a doubles match with sister Venus. Serena, the world number one singles player, called the doctor to Court One just after she and Venus had warmed up for their second round match against Kristina Barrois and Stephanie Voegele. She broke down in tears as she consulted with the doctor and physio before the tournament referee and supervisor were called to court in a reflection of her status in the sport. The Williams sisters retired from the match. (GLYN KIRK/AFP/Getty Images) ( DV1802139 )

Serena and Venus Williams of the United States during their Ladies Doubles second round match against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00569_Day_Eight_ )

Serena Williams of the United States recieves treatment during the warm up before their Ladies Doubles second round match with Venus Williams (l) against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00563_Day_Eight_ )

Serena and Venus Williams of the United States during their Ladies Doubles second round match against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 493862811MW00568_Day_Eight_ )