By Frank Dalleres Defending champion Novak Djokovic stirred more controversy at the Australian Open when he verbally confronted a heckling spectator during his second-round win over Alexei Popyrin. The 24-time Grand Slam winner told a fan to “say it to my face” early in the fourth and final set of a testing match against home favourite Popyrin that ended 6-3 4-6 7-6 (7-4) 6-3. “It was not a great atmosphere for me to play in to be honest but you have to find a way to win, accept the conditions you are playing in,” Djokovic told Eurosport. “People made a noise between first and second serves th…