Novak Djokovic-s Balkans charity tennis tournament suffered an embarrassing setback on Saturday when the planned Montenegro leg was cancelled over coronavirus protocol rules. The Adria Tour, which features world number one Djokovic, as well as the likes of third-ranked Dominic Thiem, number seven Alexander Zverev and Grigor Dimitrov, the world 19, got underway in Belgrade on Saturday. The Montenegro leg was due to be the third stop on June 27 and 28 after Croatia and before the conclusion in Bosnia. However, a spokesman for the organisers said the visit to neighbouring Montenegro was called off when it became apparent Serbia did not match strict health guidelines.

"The fact that citizens of Serbia are not on the list of the Montenegrin public health institute, and cannot travel to Montenegro, is an insurmountable obstacle," organisers said in a statement. Podgorica reopened its borders on June 1 for countries with fewer than 25 people infected with the coronavirus from 100,000 inhabitants. The list of those countries is regularly updated. However, Serbia does not figure on it. Asked to comment on social distancing measures during the Belgrade leg of the event, which has witnessed packed stands, Djokovic said that both Serbia and the region were relatively successful in containing the virus.