MELBOURNE, Australia — With Novak Djokovic clutching his leg and struggling to breathe, it looked like the “Big 4” semifinal lineup at the Australian Open might not come together.

Then Djokovic’s championship instincts kicked in.

The top-ranked Serb held off No. 5 David Ferrer in a second-set tiebreaker Wednesday night and then raced through the third set for a 6-4, 7-6 (4), 6-1 win, setting up a rematch of last year’s final against fourth-ranked Andy Murray.

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