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PARIS, FRANCE - JUNE 06: Novak Djokovic poses with the Trophy 'La Coupe des Mousquetaires', at Place de la Concorde on June 6, 2016 in Paris, France. Novak Djokovic wins his first French Open and becomes the first man since 1969 to hold all four Grand Slam titles concurrently. (Photo by Stephane Cardinale - Corbis/Corbis via Getty Images)

PARIS, FRANCE - JUNE 06:  Novak Djokovic poses with the Trophy 'La Coupe des Mousquetaires',  at Place de la Concorde on June 6, 2016 in Paris, France.  Novak Djokovic wins his first French Open and becomes the first man since 1969 to hold all four Grand Slam titles concurrently.  (Photo by Stephane Cardinale - Corbis/Corbis via Getty Images)