A supporter of Serbia’s Novak Djokovic waves a Serbian flag during a Davis Cup quarterfinal tennis match against Spain’s Albert Ramos-Vinolas, in Belgrade, Serbia, Friday, April 7, 2017. (AP/RSS Photo/Darko Vojinovic)
A supporter of Serbia’s Novak Djokovic waves a Serbian flag during a Davis Cup quarterfinal tennis match against Spain’s Albert Ramos-Vinolas, in Belgrade, Serbia, Friday, April 7, 2017. (AP/RSS Photo/Darko Vojinovic)