TOPSHOT - US Serena Williams trains at the Olympic Tennis Centre in Rio de Janeiro, Brazil, on August 3, 2016, ahead of the Rio 2016 Olympic Games. / AFP / LUIS ACOSTA (Photo credit should read LUIS ACOSTA/AFP/Getty Images)
TOPSHOT - US Serena Williams trains at the Olympic Tennis Centre in Rio de Janeiro, Brazil, on August 3, 2016, ahead of the Rio 2016 Olympic Games. / AFP / LUIS ACOSTA (Photo credit should read LUIS ACOSTA/AFP/Getty Images)