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 seventh match point after four hours and one minute.
The signs did not look good for Prizmic when he dropped his opening service game and then took a medical time-out at 2-3 for treatment to his left groin.
He already had tape on his right arm and could find nothing to hurt Djokovic in the first set, but things began to change early in the second.
Djokovic won a staggering 17 of his 19 tie-breaks at grand slams in 2023, including 15 in a row from the second round in Melbourne to the Wimbledon final, but here he played a very poor one and suddenly what had seemed a straightforward occasion became anything but.
Djokovic, who was dabbing his brow and puffing his cheeks, was making a lot of uncharacteristic errors and Prizmic fought back from 2-0 down in the third set to lead by a break at 3-2.
There was concern on the face Djokovic’s coach Goran Ivanisevic, who was among the spectators watching his countryman Prizmic’s run to the French Open junior title last year.
Djokovic ultimately found a way through, but the 36-year-old’s rivals will have been watching closely.
Fifth seed Andrey Rublev was hugely relieved after edging past Brazil’s Thiago Seyboth Wild in a fifth-set tie-break.
Rublev had in his mind his good friend Daniil Medvedev’s exit to Seyboth Wild at the same stage of the French Open last summer and he trailed 4-1 in the deciding tie-break after seeing a two-set lead and then four match points come and go.
But Rublev fought his way back to clinch a 7-5 6-4 3-6 4-6 7-6 (10/6) victory after three hours and 42 minutes.
Former Wimbledon finalist Matteo Berrettini was a casualty without taking to the court, the Italian pulling out as his injury woes continued.
Berrettini had been due to face Stefanos Tsitsipas on Rod Laver Arena on Monday in one of the plum ties of the first round.
But on Sunday afternoon tournament organisers announced he had withdrawn with a right foot injury, making it the fourth time in the last eight grand slam tournaments where he has not been able to play a match.
Berrettini has been replaced in the draw by Belgian lucky loser Zizou Bergs, who will take on Tsitsipas.
Fourth seed Jannik Sinner, one of the favourites for the title following his stellar end to 2023, began his campaign with a straight-sets win over Botic van de Zandschulp.
Sinner, who beat Djokovic twice in a matter of days at the ATP Finals and Davis Cup in November, was a 6-4 7-5 6-3 winner on Rod Laver Arena.
The Italian did not play a warm-up tournament after his late finish to last season and he said: “I feel like I started off actually really well for the first match.
“Then after I had some moments where I made a couple of wrong choices, but this can happen. It was important today for me because I was looking forward to stepping on the court.”
Twelfth seed Taylor Fritz was twice a set down to Facundo Diaz Acosta and needed treatment after rolling his ankle but recovered to claim a 4-6 6-3 3-6 6-2 6-4 victory.
Former finalist Marin Cilic played his first grand slam match since the US Open in 2022 following knee surgery but was beaten in four sets by Hungary’s Fabian Marozsan.
Sinner inspires comeback to help Italy reach Davis Cup semi-finals
Jannik Sinner kept Italy's hopes of retaining the Davis Cup alive after winning matches in the singles and doubles to inspire a 2-1 comeback triumph over Argentina on Thursday.
Sinner and Matteo Berrettini edged Maximo Gonzalez and Andres Molteni 6-4 7-5 in the deciding game to set up a rematch of last year's showpiece against Australia in the final four.
However, the Italians started off on the back foot when Francisco Cerundolo downed Olympic bronze medallist Lorenzo Musetti 6-4 6-1 in an hour and 29 minutes.
Musetti converted just two of the eight break points he was presented with, as Cerundolo put Argentina on the brink of reaching the semi-finals for the first time since 2016.
But two-time grand slam champion Sinner, who won the ATP Finals last weekend, carried his momentum forward from Turin against Sebastian Baez.
The world number one breezed to a 6-2 6-1 win over his opponent, serving seven aces to the Argentine's one, while also saving all four break points he faced.
Sinner then returned to the court alongside Berrettini, with the pair replacing Simone Bolelli and Andrea Vavassori in the must-win clash.
The pair won 90% of their first-serve points and fended off all five break points they faced, earning a key break at 5-5 in the second set before surging to victory.
"It was a must-win match," said Sinner. "Very different conditions. The court is very, very fast and tough to play.
"I haven't had so much time to adapt to the conditions, but I'm happy about today."
Data Debrief: The Italian Job
Italy edged closer to becoming only the sixth nation to retain the Davis Cup since the final stage was introduced 52 years ago, and first since the Czech Republic in 2013.
But they were inspired by Sinner once again, who proved why he will end the year at the summit of the ATP rankings.
And after leading Italy to their first Davis Cup title since 1976 with a victory against Australia's Alex de Minaur last year, he will fancy his chances this time around.
Ebden and Thompson send Australia to third straight Davis Cup semi
Matthew Ebden and Jordan Thompson booked Australia's place in the Davis Cup semi-finals after the pair clinched their deciding match against the United States to win 2-1.
The pair, who won gold at the Paris Olympics, beat Tommy Paul and Ben Shelton 6-4 6-4 to put Lleyton Hewitt's side into their third successive semi-final at the men's team event.
Australia, who have won the tournament 28 times, largely had Thanasi Kokkinakis to thank after his remarkable triumph over Shelton in the first match of the day.
Kokkinakis saved four match points and let slip six of his own before eventually prevailing 6-1 4-6 7-6 (16-14) in an engrossing encounter that lasted two hours and 14 minutes.
However, in the rematch of a recent ATP Finals group-stage match, Taylor Fritz emerged victorious over Alex De Minaur as he did in Turin a week ago.
Despite De Minaur going 2-0 up in the second set, Fritz roared back to earn a 6-3 6-4 victory to send the tie the distance in Malaga.
But Australia held their nerve, and will discover their opponents later on Thursday when reigning champions Italy take on Argentina.
Ebden and Thompson’s win came after United States’ captain Bob Bryan opted for a late change, with Paul and Shelton replacing Austin Krajicek and Rajeev Ram.
“We were expecting the other pair, but we knew they’ve got incredible players who can play doubles,” said Ebden.
“We were ready. A slight adjustment obviously. More huge serving singles players than the doubles craft, maybe, but it was just as big a challenge as any.
"Out here, finals live match, just to play with Jordan here was real fun. Following what Kokk did, unfortunately Alex went down, but what a day. So fun, so happy.”
Data Debrief: Australia ready to right Davis Cup wrongs
Australia have failed to win the Davis Cup since 2003, but they will be confident of halting that streak this time around.
If they take the trophy, they will have reason to thank Kokkinakis, whose tie-break win against Shelton was the longest an Australian player had featured in at the tournament, surpassing Pat Rafter's win over David Rikl in the 1997 quarter-finals of the competition (15-13).
Ebden and Thompson also shone when it mattered most, serving four aces compared to Paul and Shelton's two, while also winning 92% of their first-serve points.
Paolini and Bronzetti seal fifth Billie Jean King Cup for Italy
Victories for Jasmine Paolini and Lucia Bronzetti handed Italy their fifth Billie Jean King Cup title as they overcame Slovakia in Wednesday's final in Malaga.
Italy, who were beaten in last year's final by Canada, overcame Poland in the semi-finals on Monday as Paolini partnered Sara Errani for a decisive doubles win over world number two Iga Swiatek and Katarzyna Kawa.
The showpiece contest began with Bronzetti triumphing 6-2 6-4 against Viktoria Hruncakova, before Paolini took to the court to face Rebecca Sramkova.
The world number four – who won doubles gold at the Paris Olympics in August to cap her breakout year – eased past Sramkova by a 6-2 6-1 scoreline to ensure a doubles match was not required.
Speaking after Italy claimed the trophy for the first time since 2011, Bronzetti heaped praise upon her team-mate and revealed she had struggled to sleep before playing in front of 12-time grand slam champion King.
"Jasmine raised her level really high this year. She's an example for all of us," Bronzetti said.
Asked about King's presence in the crowd, Bronzetti added: "She is a great person, a great legend. I didn't sleep very well.
"You're not playing just for yourself. You're playing for your team and your country. We all want this trophy, and it is our dream, all Italians."
Data Debrief: Five-star Italy
Italy have claimed their fifth Billie Jean King Cup, having previously triumphed in 2006, 2009, 2010 and 2013.
Only the United States (18), Czechoslovakia/Czechia (11) and Australia (seven) have won more. Spain and Russia (also including the USSR and Russian Tennis Federation) have also tasted success five times.
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