PARIS, FRANCE - NOVEMBER 5: John Isner of USA reacts during 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: John Isner of USA reacts during day 4 of the BNP Paribas Masters held at AccorHotels Arena on November 5, 2015 in Paris, France. (Photo by Jean Catuffe/Getty Images)