Djokovic challenges Australian Open heckler before surviving Popyrin scare

World No 1 survives close call for second match in a row Serbian clashes with fan on way to 6-3, 4-6, 7-6 (4), 6-3 win Novak Djokovic survived a scare for the second match in succession to reach the third round of the Australian Open. The defending champion, who came through the longest first-round match of his grand slam career on Sunday, had to save four set points on his serve to avoid falling 2-1 down to Australia's Alexei Popyrin. The world No 1 eventually took the third set on a tie-break ...