Article Photos: Williams sisters look ahead to 2016 Rio Olympics



Serena Williams of the U.S. holds up her trophy after her tennis victory against Maria Sharapova of Russia on the final of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)

Serena Williams of the U.S. holds up her trophy after her tennis victory against Maria Sharapova of Russia on the final of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)