Djokovic, a 10-time title winner at Melbourne Park, moved into the fourth round with his most confident performance of the week, a 6-1, 6-4, 6-4 victory over the 26th-seeded Machac — who actually won their most recent previous encounter, last season.

Count Novak Djokovic as being in Danielle Collins' corner. He thinks her response to booing fans at the Australian Open was absolutely fine — which should come as no surprise, given the way Djokovic gets into back-and-forths with hecklers at his matches,