After antagonizing the Australian Open crowd during and after her second-round match, Danielle Collins received a cold welcome from the fans as she took the court for her third-round matchup with Madison Keys.

American tennis player Danielle Collins embraced the Australian Open boos after her latest win. But there's more to her heel turn than meets the eye.

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,