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Novak Djokovic from Serbia returns the ball during his Madrid Open tennis tournament final match against Andy Murray from Great Britain in Madrid, Spain, Sunday, May 8, 2016. Djokovic won 6-2 3-6 and 6-3 (Photo by Rodrigo Garcia/NurPhoto via Getty Images)

Novak Djokovic from Serbia returns the ball during his Madrid Open tennis tournament final match against Andy Murray from Great Britain in Madrid, Spain, Sunday, May 8, 2016. Djokovic won 6-2 3-6 and 6-3 (Photo by Rodrigo Garcia/NurPhoto via Getty Images)