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.

Novak Djokovic called Danielle Collins' feisty reaction to Australian Open hecklers "funny" and "smart" after himself getting riled up during his third-round win on Friday.

Danielle Collins was involved in a heated exchange with fans during her Australian Open second-round win over Destanee Aiava, with the American telling them to "shut up".