Alexander Zverev is targeting an elusive grand slam title after the Olympic Games gold medallist capped a fine year with ATP Finals glory.

Zverev outmatched defending champion and second seed Daniil Medvedev 6-4 6-4 to claim his second ATP Finals crown in Turin on Sunday.

Champion at the Tokyo Games, Zverev became the first player to beat the world number one and two in the semis and final since Andre Agassi in 1990, having upstaged Novak Djokovic in the final four.

After celebrating his 59 tour-level victories – the best on tour – Zverev turned his attention to grand slams.

Despite his success at the Olympics and Masters 1000 level, Zverev is yet to break through at slams having lost last year's US Open final, while reaching three semi-finals previously.

Asked if he was closer than ever to winning a slam, Zverev replied: "I think so, yeah. I mean, why not, right?

"I've kind of succeeded at every single level. There's one thing missing. I hope I can do that next year."

Zverev, who claimed a tour-leading sixth title this season, added: "They [things] couldn't be much better, to be honest.

"I'm obviously happy with how the season went, I'm happy with the finish of the season because obviously it was a great year.

"To capture the title here has been incredible."

US Open winner Medvedev also backed Zverev to conquer a grand slam tournament, saying: "Sascha is a great player who is capable of beating anybody, so he definitely can win a Grand Slam, because It’s just obvious.

"But he's not the only one and that's where it gets tough. He was in the semi-finals of the US Open and lost in five sets [to Djokovic]. Who knows maybe if he was in the final he might have beaten me.

"It's just a matter of every tournament is a different scenario and surface, you have to win seven matches to be a grand slam champion. Is he capable? Yes. Is he going to do it? We never know."

Australian Open champion Novak Djokovic does not know if he will defend his crown due to the COVID-19 mandate in Victoria.

It remains to be seen whether world number one Djokovic will fly to Melbourne in January amid vaccination requirements.

The state of Victoria, where the year's opening grand slam takes place at Melbourne Park, has introduced a vaccine mandate for professional athletes and across most industries due to the coronavirus pandemic.

As doubts over Djokovic's participation linger, the 34-year-old superstar was asked about his Australian Open plans after losing to Alexander Zverev in the semi-finals of the ATP Finals on Saturday.

"I haven't been talking to [Tennis Australia], to be honest," nine-time Australian Open champion Djokovic told reporters after his 7-6 (7-4) 4-6 6-3 defeat in Turin.

"I was just waiting to hear what the news was going to be. Now that I know, we'll just have to wait and see."

The 2021 Australian Open went ahead, albeit in February instead of January, and without fans for most of the tournament following a snap lockdown of Melbourne due to COVID-19.

Djokovic – winner of a joint-record 20 grand slam titles – was among the players critical of the conditions athletes endured prior to this year's Australian Open, with strict quarantine measures introduced.

Australian Open tournament director Craig Tiley has insisted all players, including Novak Djokovic, must be fully vaccinated against COVID-19 in order to compete at the January grand slam.

Djokovic's vaccination status is unclear, and he has so far refused to confirm whether he has been jabbed, which has led to doubts over whether he will be in Melbourne.

Victorian Premier Daniel Andrews has made it clear that tennis stars arriving for the tournament must be prepared to show proof of having protection against the virus.

For Djokovic, who is competing this week at the ATP Finals in Turin, it remains to be seen whether he is willing to go through that process.

Tiley told Channel Nine: "It's been made very clear, when the Premier announced several weeks ago that in order to participate at the Australian Open, to come into Victoria, you'll need to be fully vaccinated.

"Immediately we communicated that to the playing group, it is the one direction that you take that is going to ensure everyone's safety. All the playing group understands it, our patrons will need to be vaccinated, all the staff working at the Australian Open will need to be vaccinated.

"But when we're in a state where there's more than 90 per cent of the population fully vaccinated, they've done a magnificent job with that, it's the right thing to do."

Tiley said organisers "would love to see Novak" make the trip to a tournament he has won a record nine times.

Djokovic sits on 20 grand slam titles, the same mark as Roger Federer and Rafael Nadal. He needs one more to set the outright men's record, having lost to Daniil Medvedev in the US Open final in September.

"We have been speaking to Novak Djokovic's team and Novak and the team understand clearly that in order to come and play the Australian Open they'll need to be fully vaccinated," Tiley said, according to ABC.

"I know that he wants to play it, he's clearly indicated that and he knows the conditions that he'd have to undergo in order to be eligible to play."

The tournament is due to get under way on January 17, with the player bubbles and quarantine measures that were in force at the 2021 edition no longer in place and Melbourne Park set to operate at full capacity.

Australian player Nick Kyrgios this week said he believes the vaccine mandate is "morally wrong".

Daniil Medvedev withstood a superb fightback from home favourite Jannik Sinner to win a third straight match at the ATP Finals in Turin.

The world number two, who had already booked his semi-final slot with victory over Alexander Zverev on Tuesday, saved two match points on his way to a 6-0 6-7 (5-7) 7-6 (10-8) win in two hours and 32 minutes.

Medvedev committed just three unforced errors in a sublime opening set, wrapping it up with the minimum of fuss in 26 minutes.

A shell-shocked Sinner soon found his composure, though, and after a bruising hour and five minutes took the second set in the tie-break.

The Italian powered into a 4-2 lead in the decider, yet Medvedev fought back and sealed victory in the tie-break with a backhand winner on his second match point.

Reigning champion Medvedev will face either Casper Ruud or Andrey Rublev in the last four, with the pair facing off on Friday in the Green Group.

ACES/DOUBLE FAULTS   

Medvedev  – 18/5
Sinner – 5/2

BREAK POINTS WON 

Medvedev – 5/11
Sinner – 2/5

The MCG Ashes Test and the Australian Open will be watched by capacity crowds following the easing of coronavirus restrictions in Victoria.

Victorian premier Daniel Andrews has announced there will no longer be limits on gatherings in the state.

Andrews had revealed last month, when the latest lockdown ended, that he was hopeful at least 80,000 will be able to attend the Boxing Day Test.

Australia and England can now look forward to playing in front of a full house of 100,000 next month.

The first grand slam of the year, starting at Melbourne Park on January 17, is also set to be played without a cap on the number of spectators allowed in.

"Whether it's 100,000 people at the MCG on Boxing Day or a smaller group of people standing up at the … local pub, this is the COVID-normal that every Victorian has built," he said at a press conference.

Crowds for the 2021 Australian Open were limited to 30,000 people per day – around half capacity – prior to a snap lockdown being implemented during the tournament.

No more than 30,000 were permitted in the MCG for Australia's Boxing Day Test against India last year.

Casper Ruud fought back from a set down to claim his maiden ATP Finals victory after late replacement Cameron Norrie made a blistering start in Turin.

Norrie stepped in as a second alternate at the season-ending event at the Pala Alpitour following Stefanos Tsitsipas' withdrawal due to an elbow injury on Wednesday.

The Briton got off to a flyer in his first ATP Finals match, but eighth seed Ruud hit back to win 1-6 6-3 6-4 in the night session after losing his opening Green Group contest to world number one Novak Djokovic.

Ruud lost only two games when the two met in the San Diego Open final last month and Norrie looked hungry for revenge as he bossed the first set, grasping both break-point opportunities.

Ruud won the only break point of the second set to force a decider and just one further break was enough to get him up and running in the competition.

After becoming the first Norwegian to win an ATP Finals match, Ruud will do battle with Andrey Rublev to join Djokovic in qualifying from the group.

WINNERS/UNFORCED ERRORS 

Ruud  – 32/22
Norrie– 30/20

ACES/DOUBLE FAULTS 

Ruud  – 10/0
Norrie – 6/3

BREAK POINTS WON 

Ruud – 2/5
Norrie – 2/2

Novak Djokovic felt he had produced "a great performance" to cruise past Andrey Rublev and reach the last four at the ATP Finals in Turin.

A 6-3 6-2 triumph for Djokovic in just 68 minutes on Wednesday moved him into the semi-finals with a match to spare.

Djokovic will face alternate Cameron Norrie on Friday already knowing he will finish top of the Green Group after straight-sets wins over Casper Ruud and Rublev this week.

The Serbian dropped serve in the first game of the match against world number five Rublev but had few problems from then on.

Victory took Djokovic to 50 wins on the ATP Tour this season. He has been beaten just six times in 2021 and is now two victories away from a record-equalling sixth ATP Finals success. 

The 34-year-old has won 12 of his 13 matches since the start of the US Open, losing only to Daniil Medvedev – his main rival for glory again here – in the final of that competition.

"It was a great performance overall," said Djokovic, who won 27 of 31 points on his first serve and had 14 aces to zero double faults. 

"I served well and that helped tremendously. I wanted to put him out of his comfort zone, taking away the time and mix up the pace.

"I knew that I had to be on my toes and start well.

"I dropped my serve again like in the first match against Ruud. It was quite a nervous start from both of us until 4-3, then with new balls I somehow managed to find the right shots at the right time. 

"I made him play. Winning the first set I put additional pressure on him, and I started to maybe play more consistently from the back of the court."

Rather than 2019 winner Stefanos Tsitsipas, who has withdrawn with an elbow injury, Briton Norrie is up next for the world number one at the ATP Finals.

"I always like playing new players, particularly in one of the greatest tournaments in the world here in Turin," added Djokovic.

"Cameron deserves to be here, it is not lucky. He worked his way to Turin with great wins in Indian Wells and some other tournaments.

"So it will be fun to watch him play against Ruud and I will get ready for my next match."

Djokovic has now made the last four of the ATP Finals on 10 occasions, with this being his 40th career win in the tournament (16 defeats).

Novak Djokovic secured his spot in Saturday's semi-finals with a straight-sets victory over Andrey Rublev at the ATP Finals in Turin.

The world number one claimed a 6-3 6-2 win over world number five Rublev in the first-ever meeting between the two on Wednesday.

Djokovic confirmed his place as winner of the Green Group with his second consecutive victory, having also beaten Casper Ruud in straight sets in his opening match on Monday.

Despite Rublev's ranking, Djokovic dispatched his opponent in one hour and eight minutes as he raced to a 40th career ATP Finals victory and his 50th on tour this year.

The start of the match was close as the Russian broke Djokovic in the opening game, but the world number one responded in kind in the next game and eventually eased away to win the first set 6-3 as Rublev made some costly unforced errors. 

The second set was decided in similar fashion, with Rublev fading as Djokovic, who faces Cameron Norrie in his last round-robin match on Friday, broke twice to comfortably claim the victory.

WINNERS/UNFORCED ERRORS 

Djokovic – 19/8
Rublev – 18/26

ACES/DOUBLE FAULTS 

Djokovic – 14/0
Rublev – 6/1

BREAK POINTS WON 

Djokovic – 4/6
Rublev – 1/1

Roger Federer has confirmed he will not participate at the Australian Open and said he would be "extremely surprised" if he is fit enough to play at Wimbledon.

The 20-time grand slam winner has played just 13 matches in 2021 as he recovers from a third knee surgery in the space of 18 months, with Federer's last appearance a disappointing straight-sets loss to Hubert Hurkacz in the quarter-finals at SW19 in July.

The Swiss great has now officially confirmed he will not be at Melbourne Park for the first grand slam of 2022, while it remains touch-and-go whether Federer will be back at Wimbledon this year.

"At the moment, I expect to be able to return in the summer of 2022," he told Tribune de Geneve having confirmed playing in Australia is out of the question. 

"The next four or five months are crucial. In the spring, I will already see things much more clearly. The truth is that I would be incredibly surprised if I were to play again at Wimbledon [in 2022]."

"When you get right down to it, it doesn't make much difference whether I return in 2022 or not until 2023, at 40 or 41. It doesn't matter. The question is rather will I manage to torture myself again day after day for my comeback?

"My heart says 'yes' today. So, I'm taking things step by step. I have experienced similar challenges many times in my career sometimes without the public being aware of it. Even though I know that the end is near, I want to try to play some big matches again. It won't be easy but I will try."

Now aged 40, Federer's latest injury setback led to suggestions he could call time on his glittering career, though his coach Ivan Ljubicic this week said he was not contemplating such a decision.

Federer accepts he may never play in a grand slam final again and is at peace with that fact, but still "believes in these miracles" as he aims to once again compete among the elite level.

"If I do my rehabilitation intensively, there is a chance that I will get back to a high level," he added. 

"If I do strength training, go on the bike, swim, do balance exercises, work on my upper body, then I believe in it.

"Will I return to the Tour for a smaller round or for something bigger? Nobody knows, neither the doctors nor me. But I'm fighting for it. To be clear, my world will not collapse if I never play another grand slam final.

"But it is my ultimate dream to return once again. And in fact, I still believe in it. I believe in these kinds of miracles. I have already experienced them. 

"Sports history sometimes writes such miracles. I am realistic – it would be a great miracle but there are miracles in sport."

Daniil Medvedev eventually overcame Alexander Zverev in a high-quality contest to record his second win of this year's ATP Finals.

The Russian sealed a 6-3 6-7 (3-7) 7-6 (8-6) victory in a tight encounter in which there was only one break of serve, which came in the first game of the match for Medvedev in Turin.

Exactly a year to the day since the two faced each other in the same tournament in London, it looked like history might repeat itself to an even greater extent as Medvedev won the first set 6-3, as he had done in 2020 in a straight-sets win.

The defending champion was dominating from the baseline, but the second set saw a drastic improvement from Zverev, who hit 13 aces having managed just one in the first set.

The German could still not get close to breaking the Medvedev serve, but was able to win the tie-break to level things up.

The third set followed a similar pattern, almost inevitably ending with another tie-break. Despite saving two match points, Zverev could do nothing about the third as Medvedev secured the win and he will qualify if Hubert Hurkacz beats Matteo Berrettini in Red Group later on Tuesday.

WINNERS/UNFORCED ERRORS 

Medvedev – 36/27
Zverev – 48/25

ACES/DOUBLE FAULTS 

Medvedev – 14/1
Zverev – 18/2

BREAK POINTS WON 

Medvedev – 1/4
Zverev – 0/4

Nick Kyrgios believes the Australian Open should be cancelled as he threw his support behind rival Novak Djokovic, insisting the COVID-19 vaccine mandate is "morally wrong".

It remains to be seen whether world number one Djokovic will defend his Australian Open title in Melbourne in January due to vaccination requirements.

The state of Victoria, where the year's opening grand slam takes place at Melbourne Park, has introduced a vaccine mandate for professional athletes and across most industries amid the coronavirus pandemic.

The 2021 Australian Open went ahead, albeit in February instead of January, and without fans for most of the tournament following a snap lockdown of Melbourne due to COVID-19.

Djokovic was among the players critical of the conditions athletes endured prior to this year's Australian Open, with strict quarantine measures introduced.

Kyrgios and Djokovic have clashed in the past, but the former backed the nine-time Australian Open champion as he called for the upcoming grand slam to be scrapped.

"I don't think the Aus Open should go ahead, just for the people in Melbourne – you’ve got to send a message," Australian former world number 13 Kyrgios said on his 'No Boundaries' podcast.

"How long did [Melbourne] do in lockdown? 275 days or something?"

Kyrgios also referenced Brooklyn Nets star and NBA champion Kyrie Irving, who is yet to feature this season due to his refusal to be vaccinated against coronavirus, which is preventing him from practicing or playing – New York has a mandate in place that states players must have had a COVID-19 jab.

Kyrgios – an Australian Open quarter-finalist in 2015 – added: "Kyrie, Novak … These guys have given so much, sacrificed so much. They are global athletes who millions of people look up to.

"I just think it is so morally wrong to force someone to be vaccinated.

"I'm double vaccinated, but I just don't think it's right to force anyone [to be vaccinated] and say 'you can't come and play here because you're not vaccinated'.

"There are other solutions around it, [such as] to get tested every day. In the [United] States I know they've got rapid tests, and it's coming to Australia. It's 85 per cent success rate, you wait 15 minutes and then you're allowed to play."

Victorian sports minister Martin Pakula hit back on Tuesday, telling reporters: "I really like Nick Kyrgios and I cheer for him every time he plays and I certainly don't want to have beef with Nick Kyrgios but I actually couldn't follow the logic of his comments. We've had a long lockdown so the Australian Open shouldn't proceed? I'm not sure I follow that.

"I think the opposite applies. Melburnians, Victorians and, frankly all Australians, are absolutely gagging for major events. Our economy needs it, our state psyche needs it. It's a global grand slam, it's going to go ahead."

Novak Djokovic "feels amazing" after surpassing Pete Sampras for the year-end number one record on the ATP Tour.

Djokovic was presented with the trophy for finishing the year ranked number one for the seventh time after defeating Casper Ruud 7-6 (7-4) 6-2 in his ATP Finals opener on Monday, breaking a tie with idol Sampras.

A 20-time grand slam champion – a joint record held alongside Rafael Nadal and Roger Federer, Djokovic revelled in his latest achievement.

"It feels amazing and it feels even better when you win a match and then get your hands on the trophy that I have been blessed to lift seven times," Djokovic said in Turin.

"[I have won] one more than Pete Sampras, who was my childhood hero. He was the one that got me into tennis. He was also an inspiration to me and I dreamt of being a Wimbledon champion and World No. 1 like he was.

"Fast forwarding to today, it is quite amazing to be in this position. I am very grateful. It is something I am very much appreciating and not taking for granted."

World number one Djokovic is looking for his sixth ATP Finals title, though his last success came in 2016.

Djokovic produced a confident performance in his opening match against Ruud, dropping just four points behind his first serve and rallying from a break down in a tight opening set.

The top seed – who tied Ivan Lendl for second-most wins (39) in the history of the ATP Finals – will also face Stefanos Tsitsipas and Andrey Rublev in the Green Group.

"It was a really terrible start, but also funny because I’m still trying to figure out what happened," Djokovic said. "Casper started strong. He was serving well. The altitude, fast court, fast balls – it favours big servers. I knew he had a solid serve, but maybe not as good as Medvedev or Zverev. 

"He did positively surprise me with this serve, particularly in the first set. I just managed to read it better in the second set. But it was a close one."

Djokovic, meanwhile, expressed his shock amid the unknown whereabouts of WTA player Peng Shuai.

The Women's Tennis Association (WTA) has opened an investigation into Peng's sexual assault allegations against a former China leader.

Shuai, 35, posted on Chinese social media site Weibo allegations against Zhang Gaoli – the ex-vice premier and member of the Chinese Communist Party's Politburo Standing Committee – claiming he had forced her to have sexual relations with him.

In the post, published on Tuesday before subsequently being deleted, the 2013 Wimbledon doubles champion alleged that the pair had extramarital relations and she had developed feelings for him.

All of Peng's content has since been removed from Weibo and numerous reports suggest she has not been seen in recent days.

"I did hear about it a week ago. Honestly, it's shocking that she's missing, more so that it's someone that I have seen on the tour in the previous years quite a few times," said Djokovic.

"It's not much more to say than hope that she will be found, that she's okay. It's terrible … I can imagine just how her family feels that she's missing."

Andrey Rublev returned to form by downing Stefanos Tsitsipas in their first match of the ATP Finals in Turin on Monday. 

Rublev had only won two of his past seven contests before arriving at the season-ending tournament at the Pala Alpitour but saw off fourth seed Tsitsipas 6-4 6-4. 

The fifth seed from Russia gained sweet revenge, having lost to his Greek opponent in this event in London last year. 

Rublev did not face a break point as he levelled his head-to-head record with Tsitsipas at 4-4 with a statement win. 

The Moscow native won 90 per cent of points behind his first serve and broke Tsitsipas once in each set, sealing victory in an hour and a half. 

Rublev joined world number one Novak Djokovic at the top of the Green Group on a night to forget for Tsitsipas. 

WINNERS/UNFORCED ERRORS 

Rublev – 31/7
Tsitsipas – 31/17

ACES/DOUBLE FAULTS 

Rublev – 9/3
Tsitsipas– 12/2

BREAK POINTS WON 

Rublev – 2/7
Tsitsipas – 0/0

Novak Djokovic made a confident start to his ATP Finals with a straight-sets victory over Casper Ruud in Turin.

The world number one is looking for his sixth ATP Finals title, though his last success came in 2016, and he overcame his Norwegian opponent 7-6 (7-4) 6-2 on Monday.

Ruud showed glimpses of the form that saw him become the first Norwegian to qualify for the season-ending tournament, but despite coming close to edging the first set, he never looked like upsetting the Serbian, who recently clinched the year-end number one ranking for a record seventh time.

It started well enough for the 22-year-old, breaking Djokovic in the first game and going 2-0 up before the crowd had settled.

His opponent soon recovered to break back, showing some of his trademark steel to come out on top in the longer rallies. Ruud was able to take the first set to a tie-break, but Djokovic secured it with a beautiful forehand-winner down the line.

Ruud pulled off some impressive winners himself on occasion, with some nice drop shots in particular, but he was rarely able to keep up with the number one seed's pace and power.

Djokovic won 20 of 21 first-serve points in the opening set, and his overall performance stepped up another notch in the second as he returned the favour to Ruud by breaking him in the first game.

The result was never in doubt from there, with Djokovic dominating on his serve again, only failing to get his first serve in once in the second set.

Ruud did not manage another break point after the opening game of the match and was forced to see his opponent comfortably serve out to open his tournament with a victory.

WINNERS/UNFORCED ERRORS 

Djokovic – 23/13
Ruud – 23/20

ACES/DOUBLE FAULTS 

Djokovic – 10/0
Ruud – 9/4

BREAK POINTS WON 

Djokovic – 3/5
Ruud – 1/1

There was agony for Matteo Berrettini as he was forced to retire in his first match of the ATP Finals against Alexander Zverev on home soil.

Italian Berrettini appeared to suffer an abdominal injury when trailing 1-0 in the second set after Zverev won the first 7-6 (9-7) in their opening Red Group match in Turin on Sunday.

Sixth seed Berrettini dropped his racket and put his head in his hands as he grimaced after crashing a forehand into the net and underwent lengthy treatment to his left side.

The world number seven attempted to continue, but was clearly in pain as he served and duly brought the contest to an end at the Pala Alpitour.

Berrettini cut an emotional figure and was embraced by Zverev before being given a great ovation as he trudged off the court, with his opponent standing to applaud.

Zverev had saved two set points in the opening set and came from 5-3 down in the breaker to edge in front before the match came to a premature end.

WINNERS/UNFORCED ERRORS 

Zverev – 21/9
Berrettini– 16/23

ACES/DOUBLE FAULTS 

Zverev – 10/1
Berrettini – 5/0

BREAK POINTS WON 

Zverev – 0/5
Berrettini – 0/2