Novak Djokovic has leapt to the defence of Australian Open villain Danielle Collins as crowd behaviour continues to cause issues at Melbourne Park. The 10-time champion battled a heckler, berated technology,

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.