"""(FILES) In this file photo taken on June 12, 2020 (LtoR) German tennis player Alexander """"Sascha"""" Zverev, Serbian tennis player Novak Djokovic, Bulgarian tennis player Grigor Dimitrov and Austrian tennis player Dominic Thiem pose for a photo after a press conference of the Adria Tour, a charity exhibition hosted by Novak Djokovic, in Belgrade. - Novak Djokovic has also tested positive for coronavirus on June 23, 2020 along with Grigor Dimitrov, Borna Coric and Viktor Troicki, after taking part in an exhibition tennis tournament in the Balkans featuring world number one Novak Djokovic, raising questions over the sport's planned return in August. (Photo by Andrej ISAKOVIC / AFP)"""
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