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Switzerland's Roger Federer raises his trophy as he celebrates his victory against Spain's Rafael Nadal after their final match at the Swiss Indoors tennis tournament on November 1, 2015 in Basel, northern Switzerland. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

Switzerland's Roger Federer raises his trophy as he celebrates his victory against Spain's Rafael Nadal after their final match at the Swiss Indoors tennis tournament on November 1, 2015 in Basel, northern Switzerland.  AFP PHOTO / FABRICE COFFRINI        (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)