See No. 13 in the count down of the winners and losers, and the best, worst or most memorable stories from the 2016 Olympics.
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Jack Sock was the sole tennis player to win two medals in Rio, that in men's doubles alongside the steady Steve Johnson (bronze) and mixed doubles with the vivacious Bethanie Mattek-Sands (gold). Don't look now—or do—but he was also the only pro under age 30 to make that mixed-dubs medal stand.