Yes, you are right. Thought the heckler was speaking some foreign language like Serbian. But on second listen it is an Aussie Dunderhead with the annoying indecipherable Aussie accent daring to harass The Djoker.novak is most likely talking to somebody on his team...not the hackler
All Serbs do not have to support Djoker but cannot imagine any Serb actively heckling Djoker at the Australian Open. It is simply unthinkable.Not that I approve unfair crowd behaviour, but why should a Serbian be forced to support Djokovic? If that would be the case, I'd feel sorry for Serbians.