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,

Novak Djokovic called out a drunk Australian Open heckler following his 6-1 6-4 6-4 win over Tomas Machac in the third round on Friday. Djokovic cruised past the 26th-seed Czech star in straight sets to set up a fourth-round showdown with 24th-seed Jiri Lehecka at Melbourne Park.

World No.7 Novak Djokovic put on a flawless performance to beat Czech Republic’s Tomas Machac 6-1, 6-4, 6-4 on Rod Laver Arena on Friday, January 17. Djokovic now has a 2-1 lead over Machac in the H2H record on the ATP Tour.