Jiri Lehecka (No. 29 in the world) takes on Novak Djokovic (No. 7) in the Round of 16 at the Australian Open.Djokovic secured a three-set win over Tomas Machac (6-1, 6-4, 6-4) in the

Novak Djokovic moved into the fourth round with his most confident performance of the week,against the 26th-seeded Tomas Machac.

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,