 BELGRADE, Serbia AP Novak Djokovics charity tennis exhibition series, combined with an overall softening of coronavirus restrictions in Serbia and Croatia, has been followed by an increase in the number of positive cases among professional athletes. Two tennis players ranked among the top 40 in the world and five players at Serbias 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. Djokovic, the top-ranked player in the world who previously said he was against taking a vaccine for the virus even if it became mandatory to travel, will now be tested as well, his media team said Monday. He is fine, he has no symptoms but nonetheless, he needs to do the test and then we will see whats going on, Djokovics media team said in a statement. Djokovic was the face behind the Adria Tour, a series of exhibition events that started in Belgrade and moved to Zadar, Croatia, this weekend. Grigor Dimitrov, a three-time Grand Slam semifinalist from Bulgaria, said Sunday he tested positive for the virus. Borna Coric played Dimitrov on Saturday in Zadar and said Monday he has also tested positive for the virus. Croatian Prime Minister Andrej Plenkovic was among the spectators at the beach resort and will also be tested. I am really sorry for any harm I might have caused, said Coric, who urged anyone who had contact with him to be tested. That could be a lot of people. Coric, Djokovic and other players, including Marin Cilic, played basketball with a local team last week and posed together for photos. Djokovic was supposed to play in the series final on Sunday, but that event was canceled. Djokovic and Dimitrov also played in the Adria Tours... 