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Defending women's singles champion Serena Williams reached the third round before falling to Elina Svitolina of Ukraine.
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Steve Johnson put on an inspired singles performance by reaching the quarterfinals and narrowly losing to eventual gold medalist Andy Murray in a third-set tiebreak.
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Madison Keys made it all the way to the semifinals in women's singles.
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Steve Johnson and Jack Sock secured a bronze medal in men's doubles by defeating Canadians Daniel Nestor and Vasek Pospisil.
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Bethanie Mattek-Sands was overjoyed to win a gold medal in mixed doubles with Jack Sock, defeating fellow Americans Venus Williams and Rajeev Ram in the final.
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Venus Williams and Rajeev Ram pose with their silver medals in mixed doubles.
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Bethanie Mattek-Sands and Jack Sock celebrate their gold medals in mixed doubles.
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Bethanie Mattek-Sands and Jack Sock, and Venus Williams and Rajeev Ram, pose with bronze medalists Lucie Hradecka and Radek Stepanek of the Czech Republic.