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Janko Tipsarevic of Serbia defeats Sam Querrey of the US during their US Open 2016 Men's Singles match at the USTA Billie Jean King National Tennis Center in New York August 30, 2016. / AFP / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

Janko Tipsarevic of Serbia defeats Sam Querrey of the US during their US Open 2016 Men's Singles match at the USTA Billie Jean King National Tennis Center in New York August 30, 2016. / AFP / TIMOTHY A. CLARY        (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)