Novak Djokovic survived a huge injury scare to get past Taylor Fritz in the Australian Open third round - but his title defence could be in ruins.

The world number one and eight-time champion in Melbourne edged Fritz 7-6 (7-1) 6-4 3-6 4-6 6-2 on Rod Laver Arena.

But the 17-time grand slam winner appeared to injure his abdominal region during the third set of the contest, which started on Friday in front of a crowd and finished on Saturday without fans as Victoria went into a five-day lockdown due to coronavirus concerns.

Fritz appeared set to reach the fourth round for the first time in his major career, but Djokovic suddenly came to life in the fifth set.

Next up for Djokovic is Milos Raonic, who he has beaten in all 11 of their meetings, but whether the Serbian is fit enough to play remains to be seen.

Djokovic told Eurosport he suspected he had suffered a torn muscle and that it was "in the clouds" whether he would be able to continue in the tournament.

Djokovic broke for 3-1 against Fritz and crucially dug himself out of a 15-40 hole in the seventh game, but a forehand into the net saw him fail to serve out the set.

Yet Djokovic was close to flawless in the tie-break, winning the first six points before closing it out, and then breaking to begin the second set.

That spurred Djokovic to win the second before the drama followed.

He took a medical timeout after the third game of the third set and then repeatedly required treatment on his abdominal region.

The injury seemed to be bothering Djokovic, who was broken after sending a forehand long in the eighth game, and Fritz closed out the set.

A struggling Djokovic was broken again in the third game of the fourth set before fans were forced to leave Rod Laver Arena ahead of restrictions being introduced in Victoria, but Fritz levelled the match.

Djokovic looked far healthier to begin the final set and he broke for 4-2 with a brilliant forehand winner after a baseline exchange, winning four straight games on his way to a post-midnight victory.

Data Slam: Djokovic's American dominance continues … just
Djokovic extended his winning streak against Americans at tour level to 17 matches. His last loss to an American opponent came against Sam Querrey at Wimbledon in 2016.

WINNERS/UNFORCED ERRORS
Djokovic – 52/53
Fritz – 62/45

ACES/DOUBLE FAULTS
Djokovic – 15/5
Fritz – 24/1

BREAK POINTS WON
Djokovic – 4/9
Fritz – 3/12