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Spain's Rafael Nadal reacts after a winning point during his quarter-final match Croatia's Marin Cilic at the Swiss Indoors tennis tournament on October 30, 2015 in Basel, northern Switzerland. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Spain's Rafael Nadal reacts after a winning point during his quarter-final match Croatia's Marin Cilic at the Swiss Indoors tennis tournament on October 30, 2015 in Basel, northern Switzerland. AFP PHOTO / FABRICE COFFRINI        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)