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.

Carlos Alcaraz has pulled out of the Australian Open after suffering a leg muscle injury in training.

The 19-year-old world number one won the US Open last September and would have been among the favourites at Melbourne Park and one of the players capable of challenging nine-time champion Novak Djokovic.

However, Alcaraz announced he would not be fit enough in time to feature, with a problem with a hamstring leaving him sidelined for the tennis season's opening grand slam.

He wrote on Instagram: "When I was at my best in preseason, I picked up an injury through a chance, unnatural movement in training.

"This time it's the semimembranosus muscle in my right leg. I'd worked so hard to get to my best level for Australia but unfortunately I won't be able to play the Care A2+ Kooyong or the Australian Open.

"It's tough, but I have to be optimistic, recover and look forward. See you in 2024 @australianopen."

The Kooyong event is an exhibition tournament ahead of the major, and it is the Australian Open where his presence will be most sorely felt.

Alcaraz has emerged as the pick of the new generation of players, with his high-intensity game winning him a legion of supporters and bringing him a host of titles already.

He earned $7.6million and picked up five singles titles last season, including the first grand slam crown of his career in New York, ending the year with a 57-13 win-loss record and the ATP top ranking.

Alcaraz's compatriot Rafael Nadal is the defending champion in Melbourne, while Djokovic returns this year after being deported from Australia 12 months ago amid a vaccination saga.

Iga Swiatek was in tears after losing to Jessica Pegula as the United States took a 2-0 United Cup semi-final lead over Poland, while Italy moved into command against Greece on Friday.

World number one Swiatek was beaten 6-2 6-2 by the impressive Pegula in just 71 minutes at Ken Rosewall Arena.

Swiatek got the better of Pegula three times last year, but the American made light work of seeing off the three-time grand slam champion this time around to put USA in front.

Pegula struck 21 winners, attacking the Swiatek serve in a commanding display just over a week before the Australian Open gets under way.

Swiatek's emotions came out after she was emphatically defeated by the world number three in Sydney.

Pegula said: "I played her today, conditions are totally different than anywhere else I played her. Obviously maybe I had a little bit of an advantage, they just flew in yesterday.

"Definitely the fastest conditions I have played her [in]. Every other place I've played her has been pretty slow. I think that favoured me a lot, and I was able to use that to my advantage and play a really super clean match.

"I think I just was able to execute my game plan probably better than I have previous times."

Frances Tiafoe backed up Pegula's win by beating Kacper Zuk, who replaced the unwell Daniel Michalski, 6-3 6-3.

That ensures Taylor Fritz has a chance to put the United States into the final if he beats Hubert Hurkacz on Saturday.

Italy are in control of the other semi-final following victories for Martina Trevisan and Lorenzo Musetti.

Trevisan upset Maria Sakkari 6-3 6-7 (4-7) 7-5 before Musetti outclassed Stefanos Sakellaridis, winning 6-1 6-1.

Novak Djokovic set up a semi-final clash with Daniil Medvedev at the Adelaide International with a straight-sets win over Denis Shapovalov.

Shapovalov wilted under pressure on his serve at the end of both sets as Djokovic claimed a 6-3 6-4 victory, though he felt the encounter was closer than the score suggested.

"The scoreline doesn't give you the right idea of what happened in the match, almost two hours for two sets, it was such a close match," Djokovic said in his on-court interview.

"I just managed to stay mentally composed in the right moments and play my best tennis."

He wrapped up the win with a backhand volley after a Shapovalov double fault handed Djokovic the key break, teeing up a meeting with Medvedev, whom he beat in the 2021 Australian Open final before losing to the Russian in the US Open showpiece later that year.

Fellow former world number one Medvedev cruised to a 6-3 6-3 win over compatriot Karen Khachanov.

Medvedev trailed 3-1 in the second set but reeled off five straight games to surge into the last four.

"We didn't play since 2019, that's pretty long," Medvedev said of his reunion with Khachanov. 

"Hopefully we can play more matches at later stages of tournaments. It's never easy, I'm happy that I managed to really raise my level, especially at the end of both sets, and I'm really happy to be through to the semis."

Sebastian Korda continued his superb run with a straight-sets win over Jannik Sinner, who was bothered by a hip issue that later forced him to pull out of his doubles match.

Korda pulled away in the second set after a tight first to win 7-5 6-1 and has won 11 of his 14 matches since the start of October.

He will take on Yoshihito Nishioka, who overcame home hope Alexei Popyrin 7-6 (7-4) 6-7 (8-10) 6-2, for a place in the final.

Former world number one Ash Barty has revealed she is pregnant with her first child.

Barty surprisingly announced her retirement from tennis last March, just two months after she ended a 44-year wait for a home triumph at the Australian Open.

The 26-year-old, who won three grand slam singles titles during her career, revealed her pregnancy via an Instagram post on Friday.

"2023 set to be the best year yet. We are so excited for our new adventure. Origi already the protective big sister," Barty wrote, alongside an image of her dog Origi next to a pair of baby shoes. 

Barty's partner Garry Kissick also took to social media to share the news, posting a similar image featuring a baby-sized Liverpool kit with the caption: "Little Red, 2023".

Barty married professional golfer Kissick last July, six years after the pair met at the Brookwater Golf Club in 2016.

In addition to last year's Australian Open, Barty enjoyed singles success at Wimbledon in 2021 and the French Open in 2019, as well as winning the women's doubles title at the 2018 US Open alongside CoCo Vandeweghe.

Teenage Czech qualifier Linda Noskova upset former world number one Victoria Azarenka to set up a semi-final showdown with Ons Jabeur at the Adelaide International.

In a match lasting almost three hours, Noskova triumphed 6-4 6-7 (3-7) 7-6 (8-6) to continue a dream run in Australia.

Noskova has already beaten third seed Daria Kasatkina in Adelaide and, on only her sixth appearance in a WTA main draw, has won five straight matches.

Further progress will be no easy feat, with top seed Jabeur – a losing finalist at Wimbledon and the US Open in 2022 – grinding out a 7-6 (7-5) 7-5 win over Ukrainian Marta Kostyuk.

On the other side of the draw, second seed Aryna Sabalenka held off a resurgent Marketa Vondrousova to win 6-3 7-5. The Belarusian had led 4-1 in the second set before losing four of the next five games and failing on match point prior to finally seeing it out.

Irina-Camelia Begu defeated fourth seed Veronika Kudermetova 7-5 6-4 to set up a last-four clash with Sabalenka.

At the ASB Classic in Auckland, top seed Coco Gauff outclassed Zhu Lin 6-3 6-2, winning 90 per cent of first-serve points, firing down eight aces, and not giving up a single break point.

Seventh seed Danka Kovinic also won 6-3 6-2 against Viktoria Kuzmova to set up a semi-final clash with Gauff, while world number 95 Ysaline Bonaventure ousted third seed Leylah Fernandez 6-4 6-2 to reach a first Tour-level semi-final where Rebeka Masarova awaits.

Emma Raducanu was in tears as she retired with an ankle injury at the ASB Classic 11 days before the Australian Open starts, while Coco Gauff beat Sofia Kenin to reach the quarter-finals.

Raducanu dished out a bagel to qualifier Viktoria Kuzmova in the first set of the round of 16 match in Auckland on Thursday, but the 2021 US Open champion was unable to continue after losing the second set 7-5.

The 20-year-old Brit ended a disappointing 2022 season early due to a wrist injury and suffered another blow ahead of the first major of this year, leaving the court in tears.

Gauff will be eyeing her maiden grand slam title in 2023 and she impressively dispatched fellow American Kenin 6-4 6-4 in the second round in the capital of New Zealand.

Top seed Gauff and her compatriot were forced to play indoors due to the rain and it was the 18-year-old who prevailed, breaking three times and saving six of the break points she faced.

The teenager will face Zhu Lin of China for a place in the semi-finals after she beat Venus Williams 3-6 6-2 7-5.

Leylah Fernandez inflicted a crushing 6-0 6-1 defeat on Julia Grabher after losing only two games in her first-round win over Brenda Fruhvirtova and the Canadian will now face Ysaline Bonaventure, who defeated Rebecca Marino in three sets.

Top seed Ons Jabeur made a winning start to the season at the Adelaide International, seeing off Sorana Cirstea 7-6 (7-3) 6-1 to set up a meeting with Marta Kostyuk

Irina-Camelia Begu claimed the scalp of Jelena Ostapenko with a 6-3 6-0 upset of the seventh seed, while Victoria Azarenka was a 6-2 7-5 winner against Zheng Qinwen and teenager Linda Noskova got past Claire Liu in straight sets.

Novak Djokovic is resigned to again missing marquee tournaments in the United States after confirming his stance on COVID-19 vaccinations remains unchanged.

The 21-time grand slam winner is set to sit out the Indian Wells Open and Miami Open after the US extended the requirement for all non-American nationals to be vaccinated.

Djokovic's participation at August's US Open may also be in doubt should those requirements, which are currently in place until April 10, continue to be extended.

But having also been forced to miss events in the likes of the US, Canada and Australia last year, Djokovic accepts he may have to do the same in 2023.

"I don't think there's anything official yet, so when it is we can speak about it," Djokovic told reporters on Thursday when asked about the US restrictions.

When told the rules have been certified by the US Transportation Security Administration, Djokovic replied: "I mean, if it is official then it is – what can I do? Nothing. 

"You know my position, so it is what it is. I'm hoping [to play], but if I can't go, I can't go."

Djokovic, cleared to compete in Australia this year, was speaking after defeating Quentin Halys 7-6 (7-3) 7-6 (7-5) in the last 16 of the Adelaide International.

The 35-year-old, who beat Constant Lestienne in straight sets in his opening singles match of 2023, trailed 5-2 in the first set but recovered well and then edged the second set.

"It was a great performance from my opponent today and I want to congratulate him for a great fight," Djokovic said in his on-court interview. "He played like a top-10 opponent. 

"He was serving big, hitting his spots and on a fast court like this it's tough to break, so two tie-breaks is a realistic score in today's match. I'm glad to overcome the challenge."

Djokovic will now face Denis Shapovalov, who saw off Roman Safiullin 6-4 6-3, for a place in the semi-finals.

"Denis is one of the most complete players out there," Djokovic said of his next opponent. "He has a very dynamic style of tennis. 

"I haven't played him for a while so I'm looking forward to it. Every match from here gets tougher."

Sebastian Korda also advanced on Thursday with a 6-4 6-4 victory against Roberto Bautista-Agut, while Jannik Sinner beat Thanasi Kokkinakis 7-6 (7-2) 6-4.

At the Maharashtra Open in Pune, top seed Marin Cilic withdrew from his quarter-final with Tallon Griekspoor due to a knee injury.

World number 95 Griekspoor will now face Aslan Karatsev for a place in the final.