Venus Williams of the United States returns a ball to her sister Serena Williams, during a practice session on the central court ahead of the upcoming 2016 Summer Olympics in Rio de Janeiro, Brazil. Venus has four gold medals, the same as her sister, Serena.

Venus Williams of the United States returns a ball to her sister Serena Williams, during a practice session on the central court ahead of the upcoming 2016 Summer Olympics in Rio de Janeiro, Brazil, Wednesday, Aug. 3, 2016. (AP Photo/Vadim Ghirda)