Serena and Venus Williams never had lost an Olympic doubles match until Sunday night, going 15-0 and earning three gold medals together.
Their first-round opponents at the Rio de Janeiro Games, the Czech Republic's Lucie Safarova and Barbora Strycova, never had won any sort of match as a pair, at any event. And they had zero wins between them in Olympic doubles competition, going a combined 0-3 with other partners.
So it was rather stunning, to say the least, when the Williams sisters were