Other than Jiri Lehecka’s attempt at staging a comeback, Novak Djokovic also faced difficulties from a disrespectful crowd and even the umpire had to intervene.

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.

Novak Djokovic has put himself at loggerheads with the Australian Open’s host broadcaster by refusing to give any more on-court interviews until he receives an apology from anchorman Tony Jones.

Novak Djokovic booked his spot in the Australian Open quarter-finals with a straight-sets win over Jiri Lehecka before snubbing the post-match interview.