Novak Djokovic was given a scare by Croatian teenager Dino Prizmic in the longest first-round match of his grand slam career.
The world number one is a big favourite to win an 11th title at Melbourne Park, where he has not lost since 2018, but he dropped the second set as 18-year-old Prizmic showed what makes him a major talent for the future.
The qualifier was briefly a break up in the third set and kept battling after Djokovic stepped things up before the defending champion finally clinched a 6-2, 6-7 (5), 6-3, 6-4 victory on his 7th match point after four hours and one minute.
It was his 90th singles match win in Melbourne.