Andy Murray Andy Murray

Gold medalist Andy Murray poses during the podium ceremony of the men's singles gold medal tennis event at the Olympic Tennis Center in Rio on Sunday. Luis Acosta/AFP/Getty Images hide caption

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Luis Acosta/AFP/Getty Images

Serbia's Novak Djokovic kisses the trophy after winning the final of the French Open tennis tournament against Britain's Andy Murray in four sets 3-6, 6-1, 6-2, 6-4, at the Roland Garros stadium in Paris, Sunday. Michel Euler/AP hide caption

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Michel Euler/AP

Serbia's Novak Djokovic has won the Australian Open six times — in 2008, 2011, 2012, 2013 and 2015, and then on Sunday. William West/AFP/Getty Images hide caption

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William West/AFP/Getty Images

Roger Federer of Switzerland (left) and Andy Murray of Great Britain hold up their trophies after the men's singles final match at Wimbledon Sunday. Clive Brunskill/Getty Images hide caption

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Clive Brunskill/Getty Images