FILE - This Aug. 4, 2012 file photo shows Serena Williams posed with her 2012 Summer Olympics gold medal during the podium ceremony of the women's singles final match at the All England Lawn Tennis Club at Wimbledon, in London. Williams has been named the WTA's Player of the Year after winning major titles at Wimbledon and the U.S. Open, and claiming gold at the London Olympics. (AP Photo/Elise Amendola, File)
FILE - This Aug. 4, 2012 file photo shows Serena Williams posed with her 2012 Summer Olympics gold medal during the podium ceremony of the women's singles final match at the All England Lawn Tennis Club at Wimbledon, in London. Williams has been named the WTA's Player of the Year after winning major titles at Wimbledon and the U.S. Open, and claiming gold at the London Olympics. (AP Photo/Elise Amendola, File)
Andy Murray of Great Britain reacts after defeating Roger Federer of Switzerland in the gold medal men's singles match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Elise Amendola)
Andy Murray of Great Britain reacts after defeating Roger Federer of Switzerland in the gold medal men's singles match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Elise Amendola)
Andy Murray of Great Britain returns to Roger Federer of Switzerland during the gold medal men's singles match at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Elise Amendola)
Andy Murray of Great Britain returns to Roger Federer of Switzerland during the gold medal men's singles match at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Elise Amendola)
United States' Serena Williams, left, celebrates with partner Venus Williams, right, after defeating Czech Republic's Lucie Hradecka and Andrea Hlavackova in a women's doubles gold medal tennis match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Victor R. Caivano)
United States' Serena Williams, left, celebrates with partner Venus Williams, right, after defeating Czech Republic's Lucie Hradecka and Andrea Hlavackova in a women's doubles gold medal tennis match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Victor R. Caivano)
** FILE ** Roger Federer of Switzerland leans on the net after he defeated Juan Martin del Potro of Argentina at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)
