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,

Danielle Collins has gotten into a back-and-forth with a booing crowd at the Australian Open after eliminating a local player

American tennis pro Danielle Collins didn't let the heckling crowd at the Australian Open get the best of her during her second-round victory on Tuesday.