MELBOURNE, Australia — 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, including Friday night at Rod Laver Arena.

Tennis great Novak Djokovic applauded Danielle Collins for her witty response to the Australian crowd's heckling during her second-round match. Collins humorously stated that the hecklers' ticket money would fund her next five-star vacation.

Tennis purists felt unsettled as Danielle Collins went right at a rowdy Australian crowd after taking out a hometown favourite in incredible scenes. But the exchange is actually healthy for the sport.