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In this photo taken June 19, 2020, Serbian tennis player Novak Djokovic, second left, poses with Bulgaria's Grigor Dimitrov, left, Serbia's Viktor Troicki and Croatia's Borna Coric, right, at a tournament in Zadar, Croatia. Novak Djokovic has tested positive for the coronavirus after taking part in a tennis exhibition series he organized in Serbia and Croatia. (AP Photo/Zvonko Kucelin)