Djokovic says Zverev to join Balkan tournament line-up

Tennis world number seven Alexander Zverev will join Novak Djokovic's Balkan tournament next month, boosting the cast of top players to descend on Belgrade as the professional season is frozen by the coronavirus.

"The phenomenal news I want to announce today is that Sasa Zverev, Alexander Zverev, will come to Belgrade," Djokovic told a press conference in the Serbian capital on Monday.

The German will join world number three Dominic Thiem and Grigor Dimitrov, ranked 19, in Belgrade on 13-14 June for the first stop of the Adria Tour.

"Three of the world's greatest tennis stars. I'm really very grateful to them," said Djokovic.

Whether spectators will be allowed remains uncertain.

"I hope some rules will be changed by June 13 and maybe we'll have the opportunity to have the audience as well," the world number one said.

"Of course, this is still uncertain, like many other things related to this situation caused by the coronavirus."