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Serena and Venus Williams stunned in Rio Olympic doubles
(CNN) -- They were one of the biggest favorites for gold -- but Serena and Venus Williams won't be topping the podium together at the Rio 2016 Olympics. The sisters, who won the women's doubles title in 2000, 2008 and 2012, were stunned in the first round by the Czech pairing of Lucie Safarova and Barbora Strycova.