Djokovic said he wanted an apology from Channel 9 and Tony Jones, who called the 24-time Grand Slam champion overrated and a has-been during an on-air appearance at Melbourne Park.

Djokovic, 37, said comments made by Channel Nine presenter Tony Jones "made a mockery of Serbian fans" and were "insulting and offensive" towards him. The presenter and Australian TV network have now apologised.

The umpire was forced to intervene as Novak Djokovic grew frustrated during his fourth-round match against Jiri Lehecka on Sunday. The 10-time Australian Open champion took the first two sets with ease but Lehecka stepped it up in the third, making it a closer contest.