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Defending champion Novak Djokovic is unsure if he will be able to play in the fourth round of the Australian Open after he survived an injury scare to battle past American Taylor Fritz.
World number one Djokovic was hampered by a side injury that restricted his movement, although he still recorded a 7-6 (7-1) 6-4 3-6 4-6 6-2 victory.
Djokovic is set to meet 14th seed Milos Raonic in the next round, but said: "I know it's a tear and I don't know if I will recover from that in two days. I don't know if I will step on court."
The Serb, who is chasing a record-extending ninth men's singles title in Melbourne and a third in a row, added: "This is one of the most special wins in my life.
"It doesn't matter who I was up against or at what round, to pull this through is something I will remember for ever.
"In the third and fourth set I just served and couldn't do much with the returns. I was just putting in two first serves.
"I just tried to stay in there. I was hoping that whatever was happening was going to feel better and towards the end of the fourth it started to feel better."
Djokovic hobbled between points, clutched his side and received medical treatment, but 23-year-old Fritz, the 27th seed, could not take advantage.
The match was the final one to be played on Rod Laver Arena on day five of the tournament and began with a crowd of up to 8,000 people in attendance at the beginning.
However, the Australian state of Victoria entered lockdown for a third time at midnight on Saturday morning and Tennis Australia warned fans they would need to leave the stadium at 11.30pm, to return to their homes before the lockdown began.
The Australian Open is still able to be played and organisers are hopeful fans will be able to return from Thursday, 18 February for the final four days of play.
However, for the next five days there will be no fans allowed, in a scene similar to the US Open that was played behind closed doors in New York in August and September.
"With the bad news today, we knew that midnight was going to be the deadline for when we go into lockdown," Djokovic said. "It was unfortunate for the crowd that we didn't finish the match with them seeing the end of the match as they were enjoying it."
Canadian Raonic moved into the fourth round with a 7-6 (7-2) 5-7 6-2 6-2 win over Hungary's Marton Fucsovics.
Dominic Thiem fought off Nick Kyrgios and a rowdy crowd to overturn a two-set deficit in a thrilling match and reach the Australian Open fourth round.
Austrian third seed Thiem weathered everything home favourite Kyrgios threw at him to prevail 4-6 4-6 6-3 6-4 6-4.
Meanwhile Australian Open crowds were sent home during Novak Djokovic's match as Melbourne began a snap five-day lockdown.
At 11.30pm local time fans were asked to leave Rod Laver Arena - where Djokovic was locked in a fourth set with Taylor Fritz - after the Victoria government had earlier announced a lockdown from midnight.
Players had savoured the atmosphere of a crowd in the preceding hours before Melbourne Park closed its doors until at least Thursday.
The sight of unmasked spectators and the sound of raucous cheers at the Grand Slam this week has been a glorious reminder of the best parts of live sport at a time when empty stadiums and piped fan noise on TV are the norm.
But it was always a fragile privilege.
People must stay at home, schools are closed and gatherings are banned, although the tennis is allowed to carry on behind closed doors.