Ten-time Australian Open champion Novak Djokovic has thrown his support behind Danielle Collins in her battle with Aussie crowds.

Machac could not capitalise on Djokovic's frustrations or sickness, and the fired-up Serbian channelled his energy into a fantastic final service game ...

It seems inevitable but Novak Djokovic and Carlos Alcaraz say it's too early to lock in a blockbuster Australian Open quarter ...