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The American tennis player Bethanie Mattek-Sands is a four-times grand slam champion in doubles, and now also an Olympic gold medallist following her victory with Jack Sock in the mixed doubles in Rio. She says it's hard to compare the achievements, but as she heads to the US Open, says she feels like a member of a very exclusive club when playing in tournaments. (Image: Bethanie Mattek-Sands, credit: Getty Images)