Gregoire Barrere withstood a barrage of aces from John Isner and a change of court triggered by Cyclone Hale as he upset the American sixth seed at the Auckland Open.

French qualifier Barrere and US veteran Isner were forced indoors by the adverse weather threat in New Zealand, with the entire Tuesday schedule taking place on inside courts and without spectators.

Despite Isner rifling down 28 aces to move 10 away from becoming the first man to post 14,000 in ATP tour and grand slam events, Barrere stuck with him and pulled off a 6-7 (3-7) 7-6 (7-5) 6-3 victory.

He snatched the only break of the match in game eight of the deciding set, before serving out for victory, with the world number 88 firing down 10 aces himself across the contest.

Argentine seventh seed Sebastian Baez also fell at the last-32 stage, bowing out 7-6 (7-1) 6-1 to American wildcard Ben Shelton.

Serbian Laslo Djere set up a second-round clash with top seed Casper Ruud by edging out Spain's Jaume Munar 3-6 6-1 7-6 (7-4), while Czech Jiri Lehecka will face second seed Cameron Norrie next after sinking Brazilian fellow qualifier Thiago Monteiro 6-3 7-5.

Ruud and Norrie received first-round byes.

At Adelaide International 2, American eighth seed Tommy Paul battled past Australian Christopher O'Connell 6-4 7-5, setting up an appetising second-round clash with Britain's Jack Draper, who won through on Monday.

There was a home success for the Australian crowd to cheer, though, as qualifier John Millman, who beat Roger Federer at the 2018 US Open, this time dug deep for a 4-6 6-3 7-6 (8-6) win against Spain's Albert Ramos-Vinolas.

Petra Kvitova defeated Elena Rybakina in the pick of the first-round matches at the Adelaide International 2 on Monday.

Two-time Wimbledon winner Kvitova hit 21 winners to 12 unforced errors on her way to a 6-3 7-5 win against reigning SW19 champion Rybakina in a match lasting 87 minutes.

Belinda Bencic, a defeated finalist in this tournament in 2021, also advanced with a 6-3 6-4 win against former world number one Garbine Muguruza to maintain her positive form.

Fellow seeded players Beatriz Haddad Maia and Danielle Collins beat Sorana Cirstea and Karolina Pliskova respectively to book their places in the last 16.

At the Hobart International, favourite Marie Bouzkova saw off Jacqueline Cristian 7-6 (7-2) 6-3, while Lauren Davis defeated Sloane Stephens 6-2 6-2 in an all-American clash.

David Goffin got off the mark with his first victory of 2023 with a straight-sets win over fifth seed Alexander Bublik in round one of the Auckland Open.

The Belgian lost both matches at the inaugural United Cup last week, but he saw off Bublik 6-3 6-4 in 74 minutes to reach the last 16 in New Zealand.

Another seeded player fell at the first hurdle on Monday as Adrian Mannarino lost 6-4 7-6 (7-4) to J.J. Wolf.

Richard Gasquet advanced with a 6-3 6-1 win over wild card Kiranpal Pannu, while Jenson Brooksby beat Fabio Fognini 6-7 (2-7) 6-1 6-3 and will now face Diego Schwartzman.

At the Adelaide International 2, fifth seed Dan Evans suffered a 7-5 7-5 defeat to Mackenzie McDonald.

Fellow seeds Alejandro Davidovich Fokina and Miomir Kecmanovic overcame Brandon Nakashima and Kyle Edmund respectively.

Rafael Nadal will return to the Dubai Tennis Championships next month, 15 years after he last competed in the competition.

Victorious in 2006, Nadal has not played at the event since 2008 but will make his return when the competition begins on February 27.

Ranked second in the world, Nadal's campaign in the United Arab Emirates will take place after the first grand slam of the year in Melbourne, where he is bidding to retain the Australian Open title he won 12 months ago.

Since he last featured at the Dubai Tennis Championships, Nadal has established himself as one of the sport's greatest players, something Colm McLoughlin, executive vice chairman and chief executive of the tournament's sponsor Dubai Duty Free, was keen to highlight.

"As one of the most instantly recognisable personalities in global sport, and one of the most decorated players to ever grace the game, we are absolutely thrilled to welcome Rafa back to the Dubai Tennis Championships after 15 years," he said.

"The last time Rafa played in Dubai, he had won three grand slams. He returns having amassed more grand slam titles than any other male player in history."

The 36-year-old followed last year's triumph in Australia with victory in the French Open for a record 22nd grand slam title.

Andrey Rublev won last year's Dubai Tennis Championships title, beating Jiri Vesely 6-3 6-4 in the final.

Novak Djokovic will face Nick Kyrgios in a practice match ahead of the Australian Open.

Djokovic marked his return to Australia by beating Sebastian Korda to win his 92nd Tour-level title on Sunday in Adelaide.

Kyrgios, meanwhile, did not feature in the inaugural United Cup for Australia after withdrawing due to injury.

They will now meet in a practice match at Rod Laver Arena on Friday, ahead of the season's first grand slam.

Ticket proceeds will go to the Australian Tennis Foundation.

The duo have had a turbulent relationship in the past, though last year appeared to be on better terms.

Kyrgios came to Djokovic's defence when the Serbian was denied entry to Australia and subsequently deported ahead of the 2022 Australian Open due to his COVID-19 vaccination status.

Australia's policy on non-vaccinated individuals entering the country has now changed, and Djokovic had his three-year suspension from the nation revoked, allowing him to compete in Melbourne this year.

Krygios has a 2-1 record against Djokovic, though both of his wins came back in 2017.

They last met in the final of Wimbledon last year, with Djokovic coming out on top 4-6 6-3 6-4 7-6 (7-3).

Novak Djokovic battled back from match point down to win his first tournament of the year with a thrilling victory over Sebastian Korda in the final of the Adelaide International 1.

The 35-year-old certainly did not have it all his own way as the American gave a brilliant account of himself, but Djokovic had the nous to get his 92nd tournament win over the line 6-7 (8-10) 7-6 (7-3) 6-4.

During a gruelling encounter that lasted three hours and 11 minutes, there was precious little to separate them with only three breaks of serve in total.

Two of those came in the first set. Korda had the initial advantage, a gorgeous backhand down the line punishing a stranded Djokovic, but he instantly hit back as his opponent found the net with what looked a routine shot.

The subsequent tie-break was similarly neck-and-neck until a Djokovic slice went long and then he put another return into the net to hand Korda the set, the Serbian venting his frustration at his team at the interval.

Korda then had the opportunity to win the championship towards the end of the second set, but Djokovic worked the situation bravely before a smashed volley emphatically saved him, with another tie-break soon arriving.

Djokovic surged into a 6-1 lead and eventually grasped his third set point, and from then on there only looked like being one winner, with the 21-time grand slam champion pouncing on his first break point in the decider to take the win.

This tournament was of course Djokovic's first in Australia since being deported ahead of the 2022 Australian Open due to his unvaccinated status.

Upon his return to the country where he has won nine grand slams, Djokovic was feeling the love.

"It's been an amazing week and [the fans] made it even more special. For me to be standing here is a gift, definitely," Djokovic said in the trophy ceremony.

"I gave it all today and throughout the week in order to be able to get my hands on the trophy.

"The support that I've been getting in the past 10 days is something that I don't think I've experienced too many times in my life, so thank you so much [to] everyone for coming out every single match."

Success ensured Djokovic levelled Rafael Nadal (92) for fourth-most men's singles titles in the Open Era, with only Ivan Lendl (94), Roger Federer (103) and Jimmy Connors (109) winning more.

Taylor Fritz claimed the deciding victory as the United States stormed into an unassailable 3-0 lead over Italy in the United Cup final.

Jessica Pegula and Frances Tiafoe paved the way for Fritz to be the hero with their victories over Martina Trevisan and Lorenzo Musetti earlier in Sunday's final in Sydney.

While Musetti retired hurt while trailing 6-2, WTA world number three Pegula dispatched Trevisan in straight sets, carrying on the form that saw her defeat Iga Swiatek in the USA's semi-final win over Poland.

And Fritz ensured that the inaugural United Cup went his nation's way with a 7-6 (7-4) 7-6 (7-6) win over Matteo Berrettini, who clawed back the first championship point but was unable to prevent his opponent taking the second.

"It's great. It’s amazing for the team to win this event. We came in with really high hopes, or at least I did, for the event," said Fritz, who is ranked ninth in the world by the ATP after winning three titles in 2022.

"I was really happy to be in that position to clinch the match."

There were jubilant scenes as the USA team rushed to celebrate with Fritz, though Tiafoe was perhaps slightly overzealous.

"Just the emotions when you win and everyone comes running at you, it’s amazing," Fritz said. "I don’t know if you saw the replay but Frances basically headbutted me!"

Aryna Sabalenka warmed up for the Australian Open by winning her first WTA title since May 2021 as she beat Linda Noskova in the Adelaide International 1 final on Sunday.

Sabalenka lost in all three of her final appearances in 2022, but she began 2023 in emphatic fashion and crowned a fine week with a 6-3 7-6 (7-4) triumph.

Noskova, who at 18 years and 43 days old became the youngest finalist of a WTA 500-level or above event since 2008, looked up for a scrap as both players threatened to break in the early stages.

But Sabalenka soon took the initiative with the match's first break to go 4-2 up thanks to a ferocious backhand, and she subsequently cruised to seal the set.

The teenager kept things tighter for much longer in the second and went close to tying the match as she found herself 5-4 up and at deuce.

But a tiebreak beckoned, and Noskova's pair of double faults helped Sabalenka open a 5-1 lead, eventually seeing out the win at the second time of asking with a powerful serve that gave her young opponent too much to do.

Sabalenka clinched her success without dropping a single set over the course of the week, something she will hope provides a springboard as she aims to improve on her previous best at the Australian Open, where she reached the fourth round in 2021 and 2022.

Coco Gauff won the third WTA title of her career as she warmed up for the Australian Open by sweeping past Rebeka Masarova in the final of the ASB Classic.

The 18-year-old was too good for Masarova throughout in Auckland, easing to a 6-1 6-1 victory in just an hour and 15 minutes on Sunday.

Gauff forced a break point in Masarova's first service game, and though the Spanish-Swiss player was able to rescue it, she was not so lucky in her next two as her ruthless opponent won the first set with back-to-back breaks.

That theme continued in the second as unforced errors from Masarova, who won just two out of 15 points on her second serve (13.3 per cent), saw Gauff break again immediately.

The American was then forced to save break points on her own serve but did so impressively as she rescued all 10 against her in the contest.

Masarova was able to get on the board again after saving another two break points, but that was as good as it got, with ultimately Gauff romping to victory in front of an impressed New Zealand crowd.

"It's been a great week for me, despite the rain," Gauff said, referring to tournament's frequent weather disruption, which also delayed the final and forced a pause at the end of the first set.

"It's my first title on hard [court] since I was 15, so I'm happy to do well on a surface that I love.

"It gives me a lot of confidence [ahead of the Australian Open]. You're never sure how your first week is going to go, but it's been a great week."

Four-time major champion Naomi Osaka has withdrawn from the 2023 Australian Open.

The 25-year-old Japanese is a two-time Australian Open winner (2019 and 2021), but tournament organisers confirmed on Sunday she will not be adding to that tally in 2023.

No reason has yet been cited for Osaka's decision, although she has not played since pulling out of the Pan Pacific Open in Tokyo in September.

Osaka endured a difficult 2022 at grand slams, losing in the first round at both the French Open and US Open, while she was bundled out in the third round of last year's Australian Open and did not compete at Wimbledon due to an Achilles injury.

The former world number one's withdrawal follows that of men's top seed Carlos Alcaraz and seven-time major winner Venus Williams due to injury. 

Reigning women's singles champion Ash Barty has also since retired following her triumph in January last year.

Osaka is currently ranked 42nd in the world and will be replaced by Dayana Yastremska in the main draw.

Tallon Griekspoor clinched his first ATP Tour title by fighting back to beat Benjamin Bonzi 4-6 7-5 6-3 in Saturday's final at the Tata Open Maharashtra in Pune.

Both Griekspoor and Bonzi were taking part in their first Tour-level final after strong campaigns in India, and it was the Frenchman who took the opener, holding firm before clinching the vital break in the 10th game.

The crucial game came at the same point in the second set, with Griekspoor converting his second break point of a back-and-forth game to snatch the momentum before levelling things up.  

Griekspoor was on top from there, breaking again in the third game of a tight decider – in which he was forced to save a further two break points – before repeating the trick to finish the job.

Asked how he mustered his response after a disappointing start, the Dutchman said: "I don't know. I think even in the first set I played well, I just played two bad games and made it hard for myself.

"All I did was keep fighting for every point, keep trying to play my best tennis. It worked out well, it was all good in the end.

"There were more nerves than usual, but it wasn't too bad. We both played really well with our service games. The nerves are always there, but I'm pleased with how I handled it today." 

Novak Djokovic clinched a 6-3 6-4 win against Daniil Medvedev in the Adelaide International semi-finals on Saturday, overcoming an injury scare to tee up a final meeting with Sebastian Korda. 

Djokovic made a fast start by breaking in Medvedev's second service game, though there was concern when the 21-time grand slam winner required a lengthy medical timeout at 5-2 up in the opening set.

With Djokovic's long-awaited return to the Australian Open just over a week away, the sight of the Serbian clutching his left hamstring was an unwelcome one, but he eventually returned to the court to take the opener 6-3.

Having shown his staying power in a low-key start to the second set, Djokovic claimed the vital break following some excellent work at the net in the seventh game, though Medvedev was ultimately the master of his own downfall after producing a double fault at break point.

Djokovic then faced break point in the next game as Medvedev desperately tried to claw his way back into the contest, but a huge second serve eventually saw him hold off the Russian, who was unable to trouble him thereafter.

Speaking court-side after teeing up his 131st ATP Tour final, Djokovic played down concerns over his hamstring issue, saying: "Thankfully, it was nothing too serious. 

"If it was, I wouldn't have been able to continue. I just tried with a medical timeout and some anti-inflammatories and I just settled in.

"The more the match went on, the more my hamstring was warmer, I guess, and bothering me less. So hopefully tomorrow it will be okay."

Asked whether he considered retiring in order to save himself for the first grand slam of the year, Djokovic added: "I can't say it didn't cross my mind today on the court. 

"But you just can't calculate on the court. At this stage of my career, every match counts, every match is a present in a way, so I just try to give my best and win wherever I am."

Yoshihito Nishioka also struggled with an injury in the day's other semi-final, but the world number 36 was less fortunate than Djokovic as he retired midway through his clash with Korda.

Korda took a close opening set via a tie-break after Nishioka ranted at a second umpire in as many days, raging when a point was replayed following an error from a line judge.

Nishioka saw his serve broken in the first game of the second set before calling a medical timeout after seeming to struggle with a leg injury, and his subsequent retirement ensured Korda advanced to his fifth ATP Tour final.

Lucia Bronzetti downed Valentini Grammatikopoulou to seal Italy's place in the final of the inaugural United Cup.

Despite losing to Poland in their City Final in Brisbane, Italy claimed a place in the Sydney play-offs as the best-placed runner-up.

Having led 2-0 overnight, Italy were pegged back by Stefanos Tsitsipas' battling 4-6 7-6 (7-2) 6-4 win over Matteo Berrettini.

That put the pressure on Bronzetti's meeting with world number 199 Grammatikopoulou.

Yet despite losing her two previous matches against Grammatikopoulou, world number 54 Bronzetti made no mistake, cruising to a 6-2 6-3 victory.

Italy will now face the United States, who beat Poland 5-0 in their semi-final, in the final on Sunday.

Coco Gauff marched into ASB Classic final with an emphatic defeat of Danka Kovinic, while Linda Noskova upset Ons Jabeur to set up an Adelaide International showdown with Aryna Sabalenka.

Gauff beat Kovinic 6-0 6-2 to move into her first hard-court final since claiming the title in Linz back in October 2019.

The top seed from the United States won the first eight games of a one-sided semi-final, making another statement just over a week before the Australian Open gets under way.

Gauff took only 73 minutes to dispatch seventh seed Kovinic and will face qualifier Rebeka Masarova in the final on Sunday.

Spaniard Masarova reached her first WTA Tour final courtesy of a 6-3 6-3 victory over Ysaline Bonaventure.

The 130-ranked Masarova, a junior French Open singles champion in 2016, served with assurance and struck 16 winners to break new ground.

It was also a memorable Saturday for Czech teenager Noskova, who claimed the scalp of world number two Jabeur with a 6-3 1-6 6-3 victory in Adelaide.

It was the 18-year-old Noskova's second win over a top-10 opponent this week, having also knocked out Daria Kasatkina.

Second seed Sabalenka will be a strong favourite to deny world number 102 Noskova the title on Sunday after she saw off Irina-Camelia Begu 6-3 6-2.

Venus Williams has withdrawn from the Australian Open due to injury and Iga Swiatek's participation could be in doubt.

The American was given a wildcard for the first grand slam of the year, but suffered an injury setback at the ASB Classic this week.

Williams was beaten by Zhu Lin of China in the second round of the tournament in Auckland on Thursday and it was revealed on Saturday she will not play at Melbourne Park.

The 42-year-old, who has shown incredible longevity in her illustrious career, is a seven-time grand slams singles champion and winner of 14 major doubles titles.

Williams won four of her grand slam doubles crowns at the Australian Open and lost her two singles finals in 2003 and 2017.

Australian Kim Birrell has been awarded Williams' wildcard place nine days before the tournament gets under way.

Meanwhile, world number one Swiatek has withdrawn from the Adelaide International 2 next week due to a shoulder injury.

Swiatek was in tears after she was beaten by Jessica Pegula while representing Poland against the United States in the United Cup on Friday.