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BASEL, SWITZERLAND - OCTOBER 28: Grigor Dimitrov of Bulgaria looks dejected after missing a point during the second day of the Swiss Indoors ATP 500 tennis tournament against Rafael Nadal of Spain at St Jakobshalle on October 28, 2015 in Basel, Switzerland. (Photo by Harold Cunningham/Getty Images)

BASEL, SWITZERLAND - OCTOBER 28:  Grigor Dimitrov of Bulgaria looks dejected after missing a point during the second day of the Swiss Indoors ATP 500 tennis tournament against Rafael Nadal of Spain at St Jakobshalle on October 28, 2015 in Basel, Switzerland.  (Photo by Harold Cunningham/Getty Images)