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Adria Tour
  • In this photo taken on Sunday, June 14, 2020, Serbia's Novak Djokovic, centre, poses with volunteers and players after the Adria Tour charity tournament in Belgrade, Serbia. Djokovic’s charity tennis exhibition series combined with an overall softening of coronavirus restrictions in Serbia has led to a spike in the number the positive cases among professional athletes. Two tennis players ranked among the top 40 in the world and five players at Serbia’s biggest soccer club have tested positive for the virus after being involved in sporting events where fans packed into the stands and social distancing was not enforced. (AP Photo/Darko Vojinovic)
  • In this photo taken on Sunday, June 14, 2020, Serbia's Novak Djokovic, centre, poses with volunteers and players after the Adria Tour charity tournament in Belgrade, Serbia. Djokovic’s charity tennis exhibition series combined with an overall softening of coronavirus restrictions in Serbia has led to a spike in the number the positive cases among professional athletes. Two tennis players ranked among the top 40 in the world and five players at Serbia’s biggest soccer club have tested positive for the virus after being involved in sporting events where fans packed into the stands and social distancing was not enforced. (AP Photo/Darko Vojinovic)
  • Austria's Dominic Thiem celebrates with the trophy after winning the final match of the Adria Tour charity tournament against Serbia's Filip Krajinovic, in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Austria's Dominic Thiem celebrates with the trophy after winning the final match of the Adria Tour charity tournament against Serbia's Filip Krajinovic, in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Austria's Dominic Thiem celebrates with the trophy after winning the final match of the Adria Tour charity tournament against Serbia's Filip Krajinovic, in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Serbia's Novak Djokovic, left, speaks with his wife Jelena during a final match of the Adria Tour charity tournament, between Austria's Dominic Thiem and Serbia's Filip Krajinovic, in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Bulgaria's Grigor Dimitrov returner the ball to Austria's Dominic Thiem during their match of the Adria Tour charity tournament in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Bulgaria's Grigor Dimitrov serves the ball to Austria's Dominic Thiem during their match of the Adria Tour charity tournament in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Fans watch a tennis match between Serbia's Novak Djokovic and Germany's Alexander Zverev, of the Adria Tour charity tournament in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Serbia's Novak Djokovic celebrates winning against Germany's Alexander Zverev during their match of the Adria Tour charity tournament in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Germany's Alexander Zverev wipes his face during the match against Serbia's Novak Djokovic, of the Adria Tour charity tournament in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • Germany's Alexander Zverev reacts during the match against Serbia's Novak Djokovic, of the Adria Tour charity tournament in Belgrade, Serbia, Sunday, June 14, 2020. (AP Photo/Darko Vojinovic)
  • In this photo taken on Friday, June 12, 2020, Serbia's Novak Djokovic, left, and Bulgaria's Grigor Dimitrov attend a press conference prior a a charity tournament Adria Tour, in Belgrade, Serbia. Dimitrov has tested positive for COVID-19, it is announced Monday June 22, 2020, leading to the cancellation of an exhibition event in Croatia where top-ranked Novak Djokovic was due to play in the final. Organizers said Sunday the exhibition has now been canceled. (AP Photo/Darko Vojinovic)
  • Serbia's Novak Djokovic, left, celebrates with Jelena Jankovic after a tennis doubles match against Serbia's Nenad Zimonjic and Olga Danilovic during the Adria Tour charity tournament, in Belgrade, Serbia, Friday, June 12, 2020. Serbian tennis player Novak Djokovic set up a series of tennis tournaments in the Balkan region while the sport is suspended amid the coronavirus pandemic. (AP Photo/Darko Vojinovic)
  • 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, Friday June 12, 2020. Serbian tennis player Novak Djokovic set up a series of tennis tournaments in the Balkan region while the sport is suspended amid the coronavirus pandemic. (AP Photo/Darko Vojinovic)