Novak Djokovic has pulled out of this week’s ATP Cup in Sydney, organisers said on Wednesday, heightening doubts over whether he will defend his Australian Open title. There has been intense speculation as to whether he will travel to Australia, having refused to confirm if he has been inoculated against the COVID-19. 

“World No.1 Novak Djokovic has withdrawn from the 2022 ATP Cup,” organisers said in a statement ahead of Saturday’s start to the team tournament.