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MASON, OH - AUGUST 19: Roger Federer of Switzerland and Novak Djokovic of Serbia pose for photographers after their match during the men's final of the Western & Southern Open at Lindner Family Tennis Center on August 19, 2018 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 19:  Roger Federer of Switzerland  and Novak Djokovic of Serbia pose for photographers after their match during the men's final of the Western & Southern Open at Lindner Family Tennis Center on August 19, 2018 in Mason, Ohio.  (Photo by Matthew Stockman/Getty Images)