A man walks past a graffiti on a wall depicting Serbia's best tennis player Novak Djokovic, in Belgrade, Serbia, Monday, Sept. 7, 2020. Title favourite Novak Djokovic was sensationally defaulted from the US Open on Sunday after hitting a line judge with a ball during his fourth-round match against Pablo Carreno Busta. (AP Photo/Darko Vojinovic)

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