Serbian President Aleksandar Vucic says the "harassment" of men's tennis world No.1 Novak Djokovic must end, with the player left in limbo by the cancellation of his visa days out from the Australian Open.

The extraordinary, escalating soap opera surrounding the world's best men's player took a new turn on Wednesday night when he flew straight into a political storm and a visa controversy on arrival into Tullamarine Airport after a 14-hour flight from Dubai.

Watch the video above for more on Novak's border bungle

The nine-time Open champion may have been armed with the vaccination exemption that will allow him to compete in Melbourne but apparently not with the correct visa to enter the country.

He is now facing deportation after his visa was revoked by the Australian government.