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In this Sunday, June 14, 2020 photo, Serbia's Novak Djokovic, centre, poses with volunteers and players after the Adria Tour charity tournament in Belgrade, Serbia. Novak Djokovic has tested positive for the coronavirus after taking part in a tennis exhibition series he organized in Serbia and Croatia. The top-ranked Serb is the fourth player to test positive for the virus after first playing in Belgrade and then again last weekend in Zadar, Croatia. His wife also tested positive. (AP Photo/Darko Vojinovic, File)