Croatian media is reporting that three tennis players/staff have tested positive for coronavirus in Zadar, including Borna Coric. Djokovic seems to have travelled home to Serbia. https://www.novilist.hr/vijesti/hrvatska/zarazena-jos-tri-tenisaca-sa-zadarskog-turnira-medu-njima-je-i-borna-coric/
You can practically see the droplets in this video. https://twitter.com/i/status/1274825462439608320
Here is a translated statement from Adria Tour officials from SportKlub. Djokovic crossed borders without being tested because he has no symptoms....
http://sportklub.rs/Tenis/ATP/a334796-Bez-simptoma-svi-koji-su-bili-u-kontaktu-s-Dimitrovom.html
http://sportklub.rs/Tenis/ATP/a334796-Bez-simptoma-svi-koji-su-bili-u-kontaktu-s-Dimitrovom.html
Pretty much every relevant player aside from Djokovic was pictured waiting to be tested last night. Marin Cilic, Borna Coric, Alexander Zverev, Donna Vekic, Andrey Rublev, Djordje Djokovic. [Luka Gerlanc / Cropix]
https://www.jutarnji.hr/vijesti/hrvatska/cilic-coric-zverev-i-ostale-zvijede-hitno-na-testiranju-novak-dokovic-je-imao-drugi-plan-15003874?utm_source=Linker.hr&utm_medium=widget&utm_campaign=razmjena%2bprometa
https://www.jutarnji.hr/vijesti/hrvatska/cilic-coric-zverev-i-ostale-zvijede-hitno-na-testiranju-novak-dokovic-je-imao-drugi-plan-15003874?utm_source=Linker.hr&utm_medium=widget&utm_campaign=razmjena%2bprometa
Aside from Borna Coric, Novak Djokovic's fitness coach Marko Paniki and Grigor Dimitrov's coach Kristijan Groh have also tested positive. Zverev, Cilic and other players are negative according to SportKlub. http://sportklub.rs/Tenis/ATP/a334804-Domino-efekat-Zarazeni-Coric-Djokovicev-kondicioni.html
I mean, this seems like a decent shout for the moment of transmission to Coric.