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LONDON, ENGLAND - NOVEMBER 13: Milos Raonic of Canada walks out for his men's singles match against Gael Monfils of France on day one of the ATP World Tour Finals at O2 Arena on November 13, 2016 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - NOVEMBER 13:  Milos Raonic of Canada walks out for his men's singles match against Gael Monfils of France on day one of the ATP World Tour Finals at O2 Arena on November 13, 2016 in London, England.  (Photo by Clive Brunskill/Getty Images)