Djordje Djokovic, younger brother of Novak, who is the Adria Tour tournament director gave a statement (below) shortly after his brother defeated Viktor Troicki.

He said that it had been cancelled due to Serbia being one of the countries who's citizens are still banned from entering that region; due to Coronavirus and that it isn't something which can be altered; meaning that it has to be cancelled.

“For weeks, we have been trying to find a way to organize everything and prepare a spectacle for all sports fans. There were more challenges, starting with the fact that the citizens of Serbia are not on the list of the Institute of Public Health of Montenegro; therefore we can not travel to Montenegro.

We hoped that this measure would be changed, but that has not happened yet. This is an insurmountable obstacle; because the number of members of our team is large, and without them we are not able to carry out all the technical details flawlessly.

Our idea was to play on clay that would be imported and placed in an attractive location in one of the coastal cities just for that occasion; as well as to bring and set all the accompanying details – stands, constructions and other elements; all because of strict standards that we follow.

In addition to all that, it was necessary to organise the arrival of judges, line judges, accompanying staff, and numerous experts.

Also, you should know that there are many other details related to the organisation of such an event, which we do not have available in Montenegro; that makes it difficult to organise the Adria Tour at the expected level. That is simply not possible now; that is why we decided to make the decision to cancel the tournament in this country, because we no longer have time to wait.”

This means Zadar is next up on the Adria Tour calendar; with Marin Cilic and Borna Cilic set to join proceedings. The final day of Adria Tour action in the first leg takes place today.

https://twitter.com/MichalSamulski/status/1271834750529961986?s=20