Novak Djokovic was dragged into a dogfight by talented teenager Dino Prizmic and had to dig deep to open his Australian Open title defence with a 6-2, 6-7, 6-3, 6-4 victory in the first round on Sunday. At a shade over four hours, it was Djokovic’s longest first-round match at a major and he heaped praise on the Croatian qualifier …
