World No 1 will 'wait and see' after vaccination is mandated Zverev to face Medvedev in final after 7-6 (4), 4-6, 6-3 win Novak Djokovic refused to say whether he will compete at the Australian Open after it was confirmed that players will have to be vaccinated against Covid-19 to enter the tournament. The world No 1 was asked whether he would play in Melbourne following his ATP Finals defeat to Alexander Zverev. "We'll see," Djokovic replied.