Maria Sakkari joined eight of her fellow co-stars from the Netflix series Break Point in suffering an early exit from the Australian Open.

Of the 10 players to have featured in the series, which first aired on the streaming platform last week, only Felix Auger-Aliassime remains following Sakkari's defeat to Lin Zhu on Friday.

Sakkari, the WTA sixth seed, went down 7-6 1-6 6-4 to world number 87 Lin, who claimed her first victory over a top-10 opponent.

Lin became the sixth Chinese female player to reach the fourth round at the Australian Open in the Open Era.

"I mean honestly, am I in a dream?" Lin said in her on-court interview.

"I have to believe in myself that I have the ability to be able to play at this high level. Who knows what's going to happen? You never know."

She added in her press conference: "It means a lot. It makes me believe that I can play at this level and I can beat a player like her.

"It took me a long time to get here, and so that's why I'm so emotional. This is not the end. Let's keep going."

Sakkari's defeat saw the Greek join Thanasi Kokkinakis, Taylor Fritz, Matteo Berrettini, Casper Ruud and Ons Jabeur in exiting the season's first grand slam within the opening three rounds.

Ruud and Jabeur were the respective second seeds in the men's and women's singles, while Berrettini and Kokkinakis both fell foul of a resurgent Andy Murray, whose victory comeback over Kokkinakis lasted almost six hours and went on beyond 4:00 am local time.

Nick Kyrgios, Ajla Tomljanovic and Paula Badosa also featured in the five-part Netflix series, which will air its second batch of episodes later in the year, but all three withdrew from the Australian Open due to injury.

A downcast Sakkari, who had rubbished the suggestion of any "Netflix curse" in a previous press conference, told reporters: "I think that my level was not good at all. I started the match by being very defensive and not hitting the ball, just being scared of playing my game.

"She had basically nothing to lose. She was playing free. She was enjoying herself. She was playing very, very well. I didn't handle the situation well.

"She was barely missing anything, [not] making any unforced errors. That's how I felt. She was very solid from both sides. I've seen her on the tour. I've never seen her playing that well, to be honest.

"Of course, beating Jil [Teichmann] in the round before, she was pretty pumped and motivated to have a good result here. She has achieved it already by beating two very good players."

Lin's next opponent will be two-time Australian Open champion Victoria Azarenka, who became the eighth female player in the Open Era to win 45+ main draw matches at the Australian Open by beating Madison Keys 1-6 6-2 6-1.

Azarenka joins Serena Williams, Maria Sharapova, Lindsay Davenport, Venus Williams, Martina Hingis, Steffi Graf and Martina Navratilova on that list.

"She's a great champion," Lin said of Azarenka. "She's a great player. I will just keep playing like I played today and trust myself, enjoy the match. Who knows?"

Sebastian Korda sent two-time finalist Daniil Medvedev packing from the Australian Open but admitted: "I'm definitely the worst athlete in the family."

It was not even a show of modesty from Korda but a reflection of the sporting success his parents and siblings have achieved.

The 22-year-old American has had big wins before, yet his 7-6 (9-7) 6-3 7-6 (7-4) win against 2021 US Open champion Medvedev on Rod Laver Arena might go down as the best of the lot. It was his first win over a top-10 player in a grand slam and means Medvedev will slide out of that elite group at the end of the tournament.

Korda has made an outstanding start to the year, defeating Andy Murray and Jannik Sinner on his way to the Adelaide International 1 final, where he took a set off Novak Djokovic.

Now he is through to the fourth round of a major for a third second time after previous runs at the French Open and Wimbledon.

Reminded about his father Petr's Australian Open men's singles title in 1998, Korda stepped in to say: "Even better, though, my sisters won the Australian Open in women's golf."

LPGA Tour stars Jessica and Nelly Korda took that title in 2012 and 2019, respectively, on the way to being recognised among the biggest stars in their sport.

Mother Regina was also an established tennis player on the WTA circuit in the 1980s and early 1990s.

"I don't know what I'm going to be ranked. My mum's career-high was number 24, my dad was two," Korda said.

"Nelly, my sister was number one, my older sister Jessica was six, so I'm definitely the worst athlete in the family so far."

As it stands, Korda has moved to 28th on the provisional ATP rankings by coming through three rounds.

He won the Australian Open boys' title in 2018 but now has bigger targets, with a fourth-round tussle against Hubert Hurkacz ahead of him.

Korda has Andre Agassi in his corner, albeit distantly. He has described the four-time Australian Open winner as a "mentor", and Las Vegas-based Agassi stayed up until the early hours at home to watch the Medvedev match.

"He texted me. He's going to bed now," Korda said after his late-night win in Melbourne.

"He's one of the most special people in my life. We started talking during COVID in 2020. He's been one of the biggest parts in my rise. Just overall as a tennis player, as a human being. We spend a lot of time together. He's very special to me."

Now 10th seed Hurkacz awaits, and Korda, seeded 29th, knows that will be a tricky assignment.

"We practise quite a bit," Korda said. "Usually whenever we practise, he actually wins the tournament. I always give him jokes about that. I'm looking forward to it. It's exciting, the fourth round of a grand slam. I'll be ready to go."

Can Korda win the Australian Open, just like his dad, and keep up the family tradition of outstanding results in the country?

"It's a special place for us," he said. "We've had some really great results. Hopefully I can do one better than the juniors and do it in the pros."

For the first time in 20 years, four or fewer of the top eight seeds in the men's singles will progress to the fourth round of the Australian Open.

Daniil Medvedev's defeat to Sebastian Korda on Friday meant he joined Casper Ruud, Taylor Fritz and defending champion Rafael Nadal in heading home early from the season's first grand slam.

According to Opta, it is the first time since 2003 that the round of 16 in Melbourne will include four or fewer of the top eight players in the competition.  

Nine-time champion Novak Djokovic, meanwhile, is struggling with injury ahead of his third-round tie with Grigor Dimitrov on Saturday, while world number six and fifth seed Andrey Rublev faces a tough test against Dan Evans.

Stefanos Tsitsipas is sure of his place in round four after the Greek third seed beat Tallon Griekspoor in straight sets. Felix Auger-Aliassime will go up against Jiri Lehecka for a place in the last eight.

Coco Gauff is excited about the prospect of players from the United States winning both singles titles at the same grand slam again following a bright start to the Australian Open for the men.

The last American to win the men's singles crown at any grand slam was Andy Roddick at the 2003 US Open.

The USA is still way out in front for all-time grand slam men's singles titles with 147, though 19 years and counting is comfortably their worst barren spell during the Open Era.

This comes after 2003 was the 15th year in a row that the USA had at least one champion in the men's majors, with the likes of Pete Sampras and Andre Agassi both prolific winners.

Of course, the drought did not extend to the women, with Serena Williams, Venus Williams, Sloane Stephens and Sofia Kenin all winning at least once since Roddick's success at Flushing Meadows.

But with eight of the last 32 in the men's draw representing the USA, there is a renewed sense of optimism – and that is even accounting for their highest seed, number eight Taylor Fritz, falling in the second round.

Gauff – who beat compatriot Bernarda Pera on Friday – is the USA's next great female hope, and she is looking forward to the day Americans claim a men's and women's double at the same slam.

Asked if there was a refreshing sense of excitement around the men, Gauff said: "Yeah, definitely. I definitely think on the men's side they're thriving.

"It's like eight people in the round of 32 I saw. I think it's incredible. It's just people that you've been rooting for for a long time, and some new faces, too, that people probably haven't been rooting for a long time but fell in love with.

"I'm just excited. On the women's side, we're always like, 'the guys need to catch up, you guys need to put in your work'. I think they're here. I'm hoping that eventually, hopefully soon, we'll have our slam champion on the men's side.

"That would be pretty cool if an American woman and guy could win the same slam. I don't know when the last time that's happened or if it's ever happened. I'll be pretty excited."

Coincidentally, it last happened at Melbourne Park. In 2003, Andre Agassi and Serena Williams were victorious at the Australian Open.

Gauff is not getting carried away, but her perception is there is genuine belief among the men now, which is being fed by unity.

"I definitely think the guys are feeling it," she said. "You can see it. I think it really comes from, not the women, but the same dynamic, where everybody is doing well, so it makes you want to do well.

"We're all not competing with each other but pushing each other. I think that's what the men are having.

"They're competing against each other but also pushing each other to be better. I'm pretty sure all the American guys get along, at least that's what I think."

There were setbacks to American men's title hopes on Friday as Frances Tiafoe and Mackenzie McDonald both lost at the last-32 stage, but there was a hugely notable win too, with Sebastian Korda beating seventh seed, two-time Australian Open runner-up and former US Open champion Daniil Medvedev in straight sets.

Iga Swiatek is growing in confidence by the day after she blew Cristina Bucsa to reach the fourth round of the Australian Open.

The world number one ruthlessly dispatched the Spanish qualifier 6-0 6-1 in just 55 minutes on Margaret Court Arena on Friday.

Swiatek won the French Open for a second time last year before claiming her first US Open title and the 21-year-old is the favourite to be crowned champion at Melbourne Park.

Reflecting on her progress through the draw so far, the Pole believes she is making great strides in her quest for a fourth grand slam triumph.

"I feel I'm more and more confident since day one here," she said. "I feel like I've done so much work to feel more confident, more relaxed on court.

"I'm pretty happy I did it because it's just a little bit easier. Whe you actually play those matches, you can feel the rhythm a little bit more.

"I don't feel like the tournament is going to start now, because first rounds are always challenging.

"I'm trying to treat every match separately. I always try to have the same mindset. I can just say that I feel more confident because I'm played a couple of matches here."

Swiatek will do battle with Elena Rybakina in the fourth round and will ensure she does her homework before facing the Wimbledon champion.

"Tactically, I'm not prepared yet. We played an exhibition in Dubai, [but] it's hard kind of to take a lot from that match," she said.

"I'm pretty sure my coach is going to be ready to give me some tips. We'll see [but] I'm not really thinking about that today."

Tournament director Craig Tiley has no plans to change the Australian Open schedule despite a 4am finish for Andy Murray and Thanasi Kokkinakis.

Murray stormed back from two sets down to beat Australian Kokkinakis 4-6 6-7 (4-7) 7-6 (7-5) 6-3 7-5 early in the early hours of Friday morning on Margaret Court Arena.

The three-time grand slam champion sealed an incredible victory in a second-round thriller that took five hours and 45 minutes to settle.

That was the longest match in Brit Murray's career and the 4.05am finish was the third-latest in the history of the sport.

Murray made his feelings over having to play at that time of day very clear, but Tiley did not see an alternative option.

"You would expect from 7pm to 12pm (the evening session) in that five-hour window, you would get two matches," Tiley said. "We also have to protect the matches. If you just put one match at night and there’s an injury, you don't have anything for fans or broadcasters.

"At this point there is no need to alter the schedule. We always look at it when we do the debrief like we do every year, we've had long matches before, at this point we've got to fit the matches into the 14 days so you don't have many options."

Murray vented his frustration at the chair umpire during the match and stated after his victory that he did not see the logic in playing so late.

"I don't know who it's beneficial for," Murray said. "We come here after the match and that's what the discussion is, rather than it being like, 'epic Murray-Kokkinakis match'. It ends in a bit of a farce.

"Amazingly people stayed until the end, and I really appreciate people doing that and creating an atmosphere for us. Some people obviously need to work the following day and everything.

"But if my child was a ball kid for a tournament and they're coming home at five in the morning, as a parent, I'm snapping at that. It's not beneficial for them. It's not beneficial for the umpires, the officials. I don't think it's amazing for the fans. It's not good for the players.

"We talk about it all the time, and it's been spoken about for years. But when you start the night matches late and have conditions like that, these things are going to happen."

World number one Iga Swiatek made an emphatic statement with a 54-minute rout of Spanish qualifier Cristina Bucsa to seal her progression to the Australian Open fourth round on Friday.

Swiatek dropped only six points in a 22-minute first set, before completing a 6-0 6-1 demolition over her 25-year-old opponent at Margaret Court Arena.

The Pole led 6-0 5-0, prompting a crowd member to shout "open the bakery", before Bucsa held her serve to avoid a dreaded double bagel.

Swiatek's victory sets up a fourth-round clash with 2022 Wimbledon champion Elena Rybakina, as the Pole chases her fourth major triumph, including the French Open and US Open crowns last year.

The 21-year-old completely outclassed her opponent, winning 82 per cent of serve points, along with 65 per cent on return, including 71 per cent on Bucsa's second serve. The Spaniard only won 19 of 71 points for the match.

Despite an unconvincing first-serve percentage of 59 per cent, Swiatek never offered up a break point, hitting 15 winners throughout the lopsided contest.

Swiatek has not dropped a set in her three matches at the tournament, giving up only six games in her past two matches.

Data slam: Swiatek demolition falls short of Barty mark

Swiatek's swift victory coincidentally came on the afternoon after Andy Murray and Thanasi Kokkinakis battled until 4am local time in a five-hour-and-50-minute epic in the men's singles.

However, the Pole's 54-minute win was not as brief as last year's champion Ash Barty who disposed of Danka Kovinic 6-0 6-0 in 44 minutes at the 2021 Australian Open.

WINNERS/UNFORCED ERRORS

Swiatek – 15/6
Bucsa – 4/21

ACES/DOUBLE FAULTS

Swiatek – 3/0
Bucsa – 1/3

BREAK POINTS WON

Swiatek – 5/10
Bucsa – 0/0

Seventh seed Coco Gauff cruised safely into the Australian Open fourth round with a straight-sets victory over compatriot Bernarda Pera on Friday.

Gauff, 18, triumphed 6-3 6-2 in one hour and 35 minutes in a competitive contest where Pera, 10 years the teenager's senior, put up a fight with her powerful left-sided forehand a feature in their first-ever meeting.

But Gauff made fewer unforced errors and produced seven aces to help her clinch a fourth-round meeting with 17th seed Jelena Ostapenko.

"Today was a tough match," Gauff said during his on-court post-match interview. "Bernarda hit the ball really hard. I was really just trying to hang in there and take the ground when I could.

"Last season she had a long match streak so I knew she'd be a tough player to beat. But I'm happy to be through to the second week."

The 2022 French Open finalist broke Pera in the fourth game and secured the opening frame inside 48 minutes.

Gauff went two breaks up in the second set, leading 4-1, but Pera offered some resistance with a break back on a double fault from the teenager. But Gauff responded to progress, converting her fourth match point.

Data Slam: Gauff maintains hot start to 2023

Gauff, who knocked off 2021 US Open champion Emma Raducanu in the second round, continued her perfect start to the calendar year, having triumphed at the Auckland Open earlier this month. Gauff won five matches in Auckland, including the final 6-1 6-1 over Rebeka Masarova.

ACES/DOUBLE FAULTS

Pera – 1/7
Gauff – 7/3

WINNERS/UNFORCED ERRORS

Pera – 24/40
Gauff – 23/29

BREAK POINTS WON

Pera – 1/5
Gauff – 4/16

Two-time grand slam runner-up Ons Jabeur says it is "time to recover and get healthier" after her shock second-round elimination from the Australian Open on Thursday.

The Tunisian second seed committed 50 unforced errors as she was bundled out of the opening major of the 2023 season, losing 6-1 5-7 6-1 loss to Marketa Vondrousova.

The defeat comes after the 28-year-old's outstanding 2022 season where she reached the finals of both the Wimbledon Championships and the US Open.

Cameras spotted Jabeur dropping to her knees in apparent despair in the halls of Rod Laver Arena after leaving the court following her loss to Vondrousova.

The Tunisian skipped the mandatory post-match press conference, but opened up on her emotion and condition on Instagram on Friday.

"Despite the health issues, I will keep fighting and come back stronger and stronger," Jabeur posted on Instagram. "Time to recover and get healthier."

Andy Murray does not believe night matches dragging on into the early hours is beneficial to anybody.

Murray came back in stunning fashion at the Australian Open in a second-round match that started late on Thursday but dragged well into Friday in Melbourne.

The former world number one reached the third round with a marathon 4-6 6-7 (4-7) 7-6 (7-5) 6-3 7-5 victory over Thanasi Kokkinakis.

At five hours and 45 minutes, the five-set thriller was the longest match of Murray's career and the second-longest in Australian Open history, as the Briton claimed victory shortly after 04:00 local time.

Murray, though, sees no benefit of playing so deep into the night.

"I don't know who it is beneficial for," he said in a press conference. "We come here after the match, and that's what discussion is [about], rather than it being [on an] epic match.

"It ends in a bit of a farce. Amazingly, people stayed until the end. I really appreciate people doing that, creating an atmosphere for us.

"Some people need to work the following day. If my child was a ball kid for a tournament [and] they are coming home at five in the morning, I'm snapping at that.

"It's not beneficial for them, it's not beneficial for the umpires, the officials. It's not good for the players. We talk about it all the time. When you start the night matches, these things are going to happen."

Murray's career appeared to reach a potential end at this very tournament four years ago due to his longstanding hip issues, and it is a testament to his determination that he remains capable of going the distance in matches.

But he acknowledged there could be a health risk from long encounters such as this one, adding: "Potentially. It's strange because the courts are fast.

"When we started tonight, it felt like there was no pressure in the ball. It's just difficult to hit winners. There was a 70-shot rally yesterday, which is not normal. [We] probably need to look at that."

Kokkinakis was blunter in his assessment, posting on Twitter: "This f****** sport, man."

Murray, a five-time finalist in Melbourne, will face Roberto Bautista Agut in the third round, having progressed to that stage of the Australian Open for the first time since 2017.

Andy Murray made a record-breaking fightback in the longest match of his career to beat Thanasi Kokkinakis in an Australian Open thriller in the early hours of Friday morning.

After finding himself two sets down, Murray drew on the fighting spirit he has produced so many times over the years to secure an incredible 4-6 6-7 (4-7) 7-6( 7-5) 6-3 7-5 win on Margaret Court Arena.

The battling Brit came off the ropes to become he first player in Open era history to win 10 grand slam matches from two sets down.

With the clock having ticked past 4am local time, the 35-year-old finally triumphed in what was the second-longest match (five hours and 45 minutes) in Australian Open history, only beaten by the 2012 final between Novak Djokovic and Rafael Nadal (five hours and 53 minutes). 

Here, Stats Perform takes a closer look at some of the numbers from Murray's incredible win.

Murray's unbeaten grand slam streak against Australian players continues

Murray's success over Kokkinakis ensured his unbeaten record against Australian opponents at majors remained intact, making it 12 out of 12.

The former world number one has lost all five of his finals at the Australian Open, but he is now into the third round at the tournament for the first time since 2017.

His victory over Kokkinakis made him just the fifth male player in the Open era to win more than 50 main-draw matches at the Australian Open, joining illustrious company in Roger Federer, Djokovic, Nadal and Stefan Edberg.

Murray's greater experience shows against big-serving opponent

Kokkinakis seized control of the match by taking the first two sets, but as Murray dragged the contest into the later stages, the Brit's experience in big matches showed.

The 37 aces fired down by Kokkinakis was his highest career tally in an ATP-level main-draw match and 27 more than Murray served up. Kokkinakis racked up an astonishing 102 winners to Murray's impressive 69.

Three-time grand slam champion Murray became just the seventh male player to feature in 250 grand slam main draw matches, roaring back to surpass Todd Martin and Federer for the most major victories from two sets down. It was his first such triumph at the Australian Open.

Murray has now won both meetings with Kokkinakis, after also defeating him in the 2015 Davis Cup, and sets up a third-round clash with Roberto Bautista Agut, with whom he holds a 3-3 head-to-head record.

Andy Murray could scarcely believe he managed to fight from two sets down to topple home favourite Thanasi Kokkinakis in five sets at the Australian Open.

In an epic match that began on Thursday but ticked well into the early hours of Friday in Melbourne, Murray prevailed 4-6 6-7 (4-7) 7-6 (7-5) 6-3 7-5 in the second-longest match in Australian Open history.

With the clock having ticked past 04:00am local time, the five-time finalist finally triumphed to become the first player in Open era history to win 10 grand slam matches having lost the opening two sets.

"I don't know. Unbelievable that I managed to turn that round," said Murray, who has reached the third round of the Australian Open for the first time since 2017.

"Thanasi was serving unbelievable. I don't know how I managed to get through it. Yeah, I have a big heart.

"I'm aware I don't look particularly happy when playing but I'm at my happiest on the inside.

"I've always loved competing and always showed my emotions when I've played. I've been criticised a lot for it over the years but that's who I am."

Finally, in a message to the fans that stuck around at Melbourne Park, Murray said: "Thanks so much to everyone for staying. It's ridiculously late. You didn't need to do that but it really helps me and Thanasi when we have all of you creating an amazing atmosphere. I think we should all get off to bed now."

Kokkinakis was in cruise control when he doubled his lead with a tie-break victory in the second set.

But he then appeared to start feeling the pressure in the third set, smashing his racquet following an angry dispute with the umpire after receiving a time violation.

Taking advantage of his opponent's loss of composure, Murray battled back from 5-2 down to force another tie-break, where Kokkinakis lost four points on his serve as the match was pushed to a fourth set.

Having been one game from defeat, the tide was turning in Murray's favour, as he teed up a decider that had looked so unlikely.

Murray spurned his first seven break points but brilliantly won his eighth attempt with the set tied at five games apiece, putting the former world number one on the verge of a stunning success.

He made no mistake as he clinched victory with a forehand winner, ending the match after five hours and 45 minutes.

Only the 2012 final between Novak Djokovic and Rafael Nadal (five hours and 53 minutes) beating it in terms of longevity in the tournament's history.

Ons Jabeur became the latest big-name casualty at the Australian Open when she suffered a second-round defeat to Marketa Vondrousova.

Jabeur has been hampered by knee and back injuries at the start of the season and the second seed suffered more pain on Rod Laver Arena, where the excellent Vondrousova sealed a 6-1 5-7 6-1 win in the early hours of Friday morning in Melbourne.

Vondrousova has been troubled by multiple wrist injuries since she was a runner-up at the French Open in 2019, but appears to have put those issues behind her.

The Czech left-hander dominated the first and final sets after Jabeur showed her fighting spirit in the second to force a decider at Melbourne Park.

A runner-up at Wimbledon and the US Open last year, tenacious Tunisian Jabeur appeared to be in some pain and struggling for breath during a match in which she made 50 unforced errors.

The world number two struck 27 winners to her opponent's 17, but followed the likes of Rafael Nadal, Casper Ruud and Emma Raducanu in making early exits when she overcooked a forehand.

Vondrousova, ranked 78th after an injury-hit 2022 season in which missed three of the four grand slams, will face compatriot Linda Fruhvirtova in round three.

Aryna Sabalenka was stuck in the biggest crisis of her tennis career 12 months ago, but the Belarusian big-hitter has found light at the end of a dark tunnel.

In a second-round win over Wang Xinyu at the 2022 Australian Open, Sabalenka served 19 double faults, and it was remarkable that she still pulled off the victory.

But it was no blip. In four matches, stretching from the 2021 WTA Finals to two tournaments in Adelaide at the beginning of the 2022 season, Sabalenka served a total of 74 double faults.

She considered it a success in round three at the Australian Open when she served 10 double faults against Marketa Vondrousova, such was the extent of her problem.

"I think it's more mental," Sabalenka said at the time, "because I put a lot of pressure on myself about my serve, and the last matches I was trying to control everything on my serve; my legs, my arm, the ball toss. And it was overthinking."

A year on, and Sabalenka is looking a different player, one that perhaps might finally be ready to win a singles grand slam.

That breakthrough might come this fortnight, with Sabalenka in scintillating form on Thursday as she beat Shelby Rogers 6-3 6-1 on Rod Laver Arena.

And here's the thing: she served three aces and not one double fault.

The yips have been cured.

"I worked a lot on my serve," said the 24-year-old after the Rogers match. "Like, really a lot. You can't even imagine how much I worked. I'm just super happy right now that everything is working.

"Oh, my God, I did almost everything to try to fix my serve. The whole year we were trying different things mentally, mental stuff, technique, technical, trying to breathe differently.

"I tried a lot. I watched a lot of different videos, from when I had no problems, when I had problems, trying to understand what is different."

Sabalenka had three double faults in her first-round win over Tereza Martincova, but three is fine, normal even. Zero in round two is something special.

The fifth seed will tackle Belgium's Elise Mertens on Saturday for a place in the last 16, knowing she managed to make it through to round four last year with a malfunctioning game.

The sky is the limit for Sabalenka if the serve is reliable. A three-time slam semi-finalist, her all-round numbers against Rogers were good, with 32 winners against 18 unforced errors a healthy ratio.

She reached the title match at the WTA Finals in November, a big moment at the end of a challenging year. Now a bigger goal is in her sights.

Novak Djokovic described his hamstring injury as "not good at all" after the muscle caused him fresh concern during a second-round win at the Australian Open.

The nine-time Melbourne Park champion needed off-court treatment in set two of his match against French qualifier Enzo Couacaud.

He lost that set, but Djokovic was able to step it up to complete a 6-1 6-7 (5-7) 6-2 6-0 victory over the world number 191.

Speaking afterwards, Djokovic was asked about the left hamstring and painted a bleak picture.

He told Eurosport: "It's not good at all, to be honest with you. I take it day to day. It was better last match, the feeling, than tonight.

"It's really up to God to help me, and the physio and everyone. I hope I'll be able to recover and be ready for a tough match-up next match."

Grigor Dimitrov awaits Djokovic in round three, with the Bulgarian a tricky customer, albeit one who trails 9-1 in the rivalry between the pair.

Djokovic's latest win, his 23rd match victory in succession at the Australian Open, was nothing if not eventful, with Couacaud turning his ankle early on and looking in danger of having to abandon the biggest match of his career.

Later on, Djokovic demanded the umpire take action after claiming rowdy fans were distracting him by shouting out.

"There was a lot happening in tonight's match," Djokovic said in an on-court interview.

"Enzo deserves credit for the fight. He played some great tennis, especially in the second set. I managed to respond well in the third and especially in the fourth. Let's keep it going."