Thiem apologizes for playing in Djokovic's tennis event

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FILE - In this Friday June 12, 2020 file photo Serbia's Novak Djokovic, second left, poses with Germany's Alexander Zverev, left, Bulgaria's Grigor Dimitrov, second right, and Austria's Dominic Thiem after a press conference prior a a charity tournament Adria Tour, 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. Grigor Dimitrov, a three-time Grand Slam semifinalist from Bulgaria, said Sunday he tested positive. (AP Photo/Darko Vojinovic)