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PARIS, FRANCE - NOVEMBER 5: Roger Federer of Switzerland answers to the media during a press conference on day 4 of the BNP Paribas Masters held at AccorHotels Arena on November 5, 2015 in Paris, France. (Photo by Jean Catuffe/Getty Images)

PARIS, FRANCE - NOVEMBER 5: Roger Federer of Switzerland answers to the media during a press conference on day 4 of the BNP Paribas Masters held at AccorHotels Arena on November 5, 2015 in Paris, France. (Photo by Jean Catuffe/Getty Images)