The tennis season has begun with Rafael Nadal, Ash Barty, Paula Badosa and Thanasi Kokkinakis among the champions at small-scale events in Australia.

Yet there has been one dominant story in the sport and little else has had a look-in in the lead-up to the Australian Open.

Now that Novak Djokovic knows his fate, there is the welcome prospect of eyes turning to matters on the tennis court, rather than the Federal Court.

With the action getting under way in Melbourne on Monday, Stats Perform looks at the main protagonists and what the numbers tell us about another high-stakes grand slam.

Djokovic absence blows open men's draw

As defending champion Djokovic heads for home, it is worth a reminder of how he has dominated this tournament.

Nine of his grand slam titles have come in Melbourne, and he has taken the trophy in each of the last three years, helping him cosy up alongside Roger Federer and Rafael Nadal on 20 majors, an all-time record they share. Of the 'Big Three', only Nadal is in the draw this year, with Federer currently on the injured list.

Djokovic has the highest win percentage in the Open Era (since 1969) at the Australian Open, among players with 20 or more wins (91.1 per cent – W82 L8). He was hoping to join Nadal (13 French Opens) and Margaret Court (11 Australian Opens) in the exclusive club of players to reach double figures for singles titles at one slam.

The Serb was also aspiring to become the first man in the Open Era to win four consecutive Australian Opens. It happened once before the tour turned professional, with Roy Emerson winning five in a row from 1963 to 1967. Djokovic has left Melbourne with the title every time that he has made it through to the semi-finals.

So who takes the title now?

Only Bjorn Borg (89.2 per cent) has a higher winning percentage in grand slam matches than Nadal (87.7 per cent) and Djokovic (87.5 per cent) in the Open Era, among players with 100 or more wins. So why not Nadal?

The 35-year-old and Djokovic have carved up 12 of the last 14 grand slam titles, Nadal winning four of those (three French Opens, one US Open). He is battling back from a foot injury lay-off and coronavirus, and might need to get the early rounds out of the way without undue stress to stand a chance at the business end.

The two exceptions in the Nadal-Djokovic sequence of slam dominance have come at the US Open, with Dominic Thiem winning in New York in 2020 and Daniil Medvedev triumphing at Djokovic's expense in last year's Flushing Meadows final. Thiem is not in Australia, but world number two Medvedev is, looking to become the third Russian man to win two slams, after Yevgeny Kafelnikov and Marat Safin.

The last man other than Federer, Nadal and Djokovic to secure back-to-back slam singles title was Andre Agassi (US Open 1999 and Australian Open 2000), but that is Medvedev's objective now, and he has the game to pull it off.

Nadal has reached at least the quarter-final stage in 15 of his last 16 grand slam appearances, winning six of those majors (four French Opens and two US Opens), so he may well be a factor.

Who else is in the frame? Alexander Zverev probably, having reached the quarter-finals in Australia in the last two seasons (SF in 2020 and QF in 2021). He won the Olympic Games and ATP Finals titles last year, so a grand slam is an obvious next step. He might want to keep double faults in check though, having served a tour-high 113 in slams last season.

Stefanos Tsitsipas reached the Australian semi-finals in 2019 and 2021, so throw him into the mix too, and Matteo Berrettini might be a threat. The Italian, a runner-up to Djokovic at Wimbledon in July, served more aces than any other player in grand slams last year (311 aces, 16.4 on average per match).

Others have more modest ambitions

Andy Murray is back at the Australian Open for the first time since 2019, when he lost in the first round against Roberto Bautista Agut in five sets and was more or less given his last rites as a tennis pro after the match, having indicated he was close to retirement.

The five-time Australian Open runner-up last won a match in this tournament in 2017, when he reached round four. A tough opener against Nikoloz Basilashvili awaits.

Spanish 40-year-old Feliciano Lopez will make his 80th appearance in a grand slam and become the second man in the Open Era with 80 or more appearances at the four majors, after Federer (81).

Do not expect an Australian to be men's champion, by the way. The last time an Australian reached the men's singles final was 2005, when Lleyton Hewitt lost against Safin, and the last home champion was Mark Edmondson in 1976.

Barty backed in stacked women's draw

For the first time since 1997, neither Serena nor Venus Williams will take part in the Australian Open. Yet the women's tour is in rude health, even without those great bastions.

Ash Barty is world number one and a standout pick for many, only enhancing her claims after winning an Adelaide International title in the run-up to this fortnight.

But there is staggering depth on the women's side at present, and Barty will face stiff competition.

Incredibly, the last five grand slam finals have featured 10 different women, and teenager Emma Raducanu's against-all-odds US Open triumph in September shows best of all that new stars are emerging.

Yet since 2000, only three non-seeded players have reached the women's singles final at the Australian Open: Serena Williams in 2007, Justine Henin in 2010 and Garbine Muguruza in 2020. 

Barty could become the first Australian to be women's champion since Chris O'Neil in 1978, and the first to reach the final since Wendy Turnbull lost to Hana Mandlikova in 1980.

The Queenslander is the top seed, and the last time the number one failed to reach at least the fourth round at Melbourne Park was in 1979, when Virginia Ruzici lost her opening match. Barty ended a long wait for an Australian winner of the women's title at Wimbledon last year, so why not closer to home as well?

Naomi Osaka is back, so what should we expect?

Truth be told, that's hard to know. Osaka took time out from tennis after the US Open to focus on her mental health and enjoyed hanging out with friends, before deciding she missed tennis enough to go back on tour.

She had three wins at the Melbourne Summer Set tournament recently before withdrawing from a fourth match, saying her body had "got a shock" from the intensity. As defending champion in the season's first major, she has a target on her back and will need to find a way to handle that.

Over the past six seasons, only Osaka has managed to win back-to-back grand slam singles titles among the women, and she has done so twice (US Open 2018 and Australian Open 2019, plus US Open 2020 and Australian Open 2021).

The last player to win back-to-back women's Australian Open singles titles was Victoria Azarenka (2012 and 2013), so it does not happen regularly.

Osaka has an 85 per cent win rate at this tournament: since 2000, only Jennifer Capriati (90 per cent) and Serena Williams (89 per cent) have had a higher win percentage in the main draw.

You want challengers to the big two? Try sticking a pin in the draw

The Daphne Akhurst Memorial Cup, which goes to the champion, is a trophy that upwards of a dozen women will seriously believe they can win.

Aryna Sabalenka has reached the semi-finals of the last two slams but is mired in some kind of hellish serving groove, having made 74 double faults in her last four matches and lost the last three in a row.

Anett Kontaveit won a tour-high 39 matches on hard courts last year but has only been to one grand slam quarter-final – last year in Australia, losing to Simona Halep.

What about Ons Jabeur, who matched Kontaveit for a tour-high 48 wins across all surfaces last year? The Tunisian is queen of the drop shot, making 147 successful such plays on tour last year, more than any other player, and recently reached the top 10 in the WTA rankings for the first time.

Maria Sakkari reached two slam semi-finals last year, the first of her career, and the form of Barbora Krejcikova and Badosa in the past week in Melbourne marks them out as contenders. Both are recent fast-risers, Krejcikova already with a French Open title to show.

WTA Finals champion Muguruza could be the second Spaniard to twice reach the Melbourne title match, after Arantxa Sanchez Vicario (1994 v Steffi Graf and 1995 v Mary Pierce). Spain has never had an Australian Open women's singles winner: former French Open and Wimbledon champ Muguruza is an authentic contender.

Halep was runner-up to Caroline Wozniacki in 2018, a semi-finalist in 2020 and quarter-finalist last year, and a Melbourne Summer Set title was a handy warm-up for the Romanian. Consider her, too.

Monica Seles, in 1991, was the last player to triumph on her debut in the main draw, but she was already a grand slam winner (1990 French Open). Given the strength of the line-up, the prospect of a bolter coming through this field is unlikely, even if the example of Raducanu tells us anything is possible.

Novak Djokovic put the Australian Open at risk and has made other participants "look like fools" by turning up for the tournament unvaccinated, according to Stefanos Tsitsipas.

World number one Djokovic was paired with Miomir Kecmanovic in Thursday's draw for the opening round, but it remains uncertain whether he will even take part in the first grand slam of the year.

The Serbian was last week given a medical exemption to enter Australia, despite not being vaccinated, only for border officials to block it upon his arrival.

Djokovic was detained for four days while waiting to appeal the case on Monday, which went in his favour at Melbourne Circuit Court.

He has since started training ahead of the Australian Open, which begins next Monday, though immigration minister Alex Hawke may yet cancel his visa for a second time.

The 34-year-old is also being investigated for breaching isolation rules in December after testing positive for COVID-19.

And as a decision regarding whether he can stay in Australia and defend his title is dragged out, Tsitsipas has become the highest-profile tennis figure to criticise Djokovic for his conduct.

"He has been playing by his own rules," world number four Tsitsipas told Indian outlet WION.

"No one would have thought: 'I can come to Australia unvaccinated and not have to follow the protocols they gave me'.

"For Novak it worked another way. It takes a lot of daring to do. Putting a Grand Slam at risk – I don't think many players would do that."

Tsitsipas, who was defeated by Djokovic in last year's French Open final, added: "There are two ways to look at it.

"One way is that almost every single player has been vaccinated and did what they had to do in order to come and play in Australia.

"We have all followed the protocols to come and compete in Australia and been very disciplined in that.

"It seems like not everyone is playing by the rules of how Tennis Australia and some governments have been putting things.

"A very small minority chose to follow their own way. It makes the majority look like they are all fools."

Djokovic has spent the past four days training on court in preparation for the Australian Open, which he has won a record nine times, including in each of the last three years.

But weighing in on the debate on Thursday, Australian deputy prime minister Barnaby Joyce said the 20-time grand slam winner must "abide by the rules" if he is to remain in the country.

"You have to be frank – the vast majority of Australians said they didn't like the idea that another individual, whether they're a tennis player or the king of Spain or the queen of England, can come up here and have a different set of rules to what everybody else has to deal with," Joyce said.

"Let's see where it goes from here… I've made my views clear. I might not agree with the fact that I have to be tested to go from New South Wales into Queensland but I do [it’. Why? Because that is the law.

"He is no better. He is still a child of God like the rest of us, isn't he? So he has got to abide by the laws."

Novak Djokovic has been drawn against Miomir Kecmanovic in the opening round of the Australian Open as the defending champion awaits to hear if he can stay in the country.

World number one Djokovic was last week given a medical exemption to enter Australia, despite not being vaccinated, only for border officials to block it upon his arrival.

The 20-time grand slam winner was detained for four days while waiting to appeal the case on Monday, which went in his favour at Melbourne Circuit Court.

Djokovic has since started training ahead of the Australian Open, which begins next Monday, though immigration minister Alex Hawke may yet cancel his visa for a second time. 

A decision on whether Djokovic can compete in the first grand slam of the year, which he has won a record nine times, could be made on Thursday.

Should he be given the all clear to take part, Djokovic will face compatriot Kecmanovic in the first round at Melbourne Park.

Thursday's draw, which was delayed by one hour and 15 minutes for unspecified reasons, also saw fellow 20-time grand slam winner Rafael Nadal paired with Marcos Giron.

Nadal is in the same half of the draw as Djokovic, meaning the pair could meet in the semi-finals, while third seed Alexander Zverev is also in the top half.

Second seed and 2021 finalist Daniil Medvedev is in the bottom half along with Stefanos Tsitsipas and will take on Henri Laaksonen first up.

In the women's draw, Australia's world number one Ash Barty will begin her quest for glory on home soil against a qualifier.

The top seed is on a collision course with defending champion Naomi Osaka, who goes face-to-face with Camila Osorio in round one on her return from a four-month break.

Reigning US Open winner Emma Raducanu is up against Sloane Stephens, who won the New York major in 2017, while Storm Sanders awaits second seed Aryna Sabalenka.

World number four Stefanos Tsitsipas is optimistic he will be fit for this month's Australian Open after coming through his first complete singles match since undergoing surgery on his right elbow last November.

Following a gruelling three-set defeat to Diego Schwartzman at the ATP Cup in Sydney on Monday, Tsitsipas was upbeat about his prospects of performing in Melbourne.

"It gets better and better every single day", Tsitsipas said of his injury. "We have plenty of time before the Australian Open begins, and I think if I take the right precautions and follow what my doctor says, then I can see myself performing at 100 per cent.

The Greek went on to reveal that medics had harboured serious doubts over his participation at the first Grand Slam of 2022, after he had been forced to withdraw from November's ATP Finals in Turin.

"Going into that surgery, even the doctor was unsure if it was a good idea to perform and play at the Australian Open.

"My recovery was much better than he expected, in comparison with other players that he has treated in the past, so he was surprised. He came to Dubai, and he was surprised to see me hitting close to 100 per cent.

The 2021 French Open finalist also claimed to have enjoyed his contest with Schwartzman, despite the defeat.

"It was good to see myself perform at such a level. I didn't expect it," he said. "It worked out better than I thought. I was able to hit balls that I was scared to hit two weeks ago, so I’m heading towards the right direction."

Tsitsipas, who has won seven ATP Tour events to date, is due to be in action once more in Sydney this week against Georgian, Nikoloz Basilashvili.

Diego Schwartzman sealed a 2-0 win for Argentina over Greece in Group D of the ATP Cup after edging a close contest with world number four Stefanos Tsitsipas.

Schwartzman claimed just the third victory of his career over a top-five opponent, winning 6-7 (5-7) 6-3 6-3 in Sydney.

The world number 13 fought back from a break down in the second set before taking his career head-to-head with Tsitsipas to 2-1 after battling through two hours and 42 minutes on Ken Rosewall Arena.

"I was just trying to think that it was his first match for two months after his elbow [injury], so I was thinking just to try and be in the match," Schwartzman said in his on-court interview.

"I had the chance and I think I was ready. I am very happy because playing against Stefanos and being a set and a break down is not easy, but I found a way."

Argentina, who earlier saw Federico Delbonis defeat Michail Pervolarakis in straight sets, will now face Poland on Wednesday to decide who progresses to the semi-finals.

Poland were comfortable 3-0 winners in their match-up with Georgia, Kamil Majchrzak beating Aleksandre Bakshi for the loss of just two games before Hubert Hurkacz defeated Aleksandre Metreveli 6-7 (5-7) 6-3 6-1.

Pablo Carreno Busta beat Viktor Durasovic 6-3 6-3 to put Spain ahead against Norway, and their win was assured when Roberto Bautista Agut claimed an impressive 6-4 7-6 (7-4) victory over Casper Ruud. Alejandro Davidovich Fokina and Pedro Martinez followed up with a straight-sets doubles win.

"Casper is playing unbelievable tennis, [he did] an unbelievable performance last year, and today I played very good," Bautista Agut said. "I returned very well, I made very few unforced errors and I played aggressively. I try to play matches like this and that is why I am practising hard and I am trying to show this level."

Spain are top of Group A ahead of Serbia, whose match with Chile will go down to a doubles decider.

Stefanos Tsitsipas withdrew from his ATP Cup match against Hubert Hurkacz on Saturday but eased injury fears after playing in the doubles.

The Greek star, ranked fourth in the world, is recovering from elbow surgery but suffered a flare-up of the problem in Sydney and pulled out of the Group D singles tie as a precaution.

With the Australian Open coming up later this month, the two-time Melbourne Park semi-finalist appeared comfortable as he paired up with Michail Pervolarakis for a 6-4 5-7 10-8 win.

"The recovery from my elbow surgery in November is on track for Melbourne and today was a precautionary step to make sure I make Melbourne," he said.

"We will see day by day, match by match until then."

Aristotelis Thanos stepped in for Greece and lost 6-1 6-2 as Hurkacz helped Poland into a 2-0 lead after Kamil Majchrzak had beaten Pervolarakis 6-1 6-4, making the doubles clash a dead rubber.

Spain, runners-up in 2020, showed no mercy on Chile despite the absence of Rafael Nadal as they stormed to a 3-0 win in Group A.

Roberto Bautista Agut downed Cristian Garin 6-0 6-3, while Pablo Carreno Busta defeated Alejandro Tabilo 6-4 7-6 (7-4). Doubles pairing Alejandro Davidovich Fokina and Pedro Martinez battled to a 7-6 (7-3) 4-6 10-7 victory over Tabilo and Tomas Barrios.

Argentina also enjoyed a 3-0 triumph in Group D, with Georgia coming up blank against a team led by Diego Schwartzman.

Serbia, without Novak Djokovic, earned a decisive doubles success to seal a 2-1 win over Norway, with Nikola Cacic and Filip Krajinovic downing Casper Ruud and Viktor Durasovic.

Stefanos Tsitsipas has been forced to withdraw from the ATP Finals in Turin because of an injury to his right elbow, with Cameron Norrie taking his place.

Tsitsipas was beaten in straight sets by Andrey Rublev - who faces Novak Djokovic next - in his opening Green Group match on Monday and was scheduled to take on Casper Ruud on Wednesday.

However, the 23-year-old's elbow issue means that ATP Finals debutant and Indian Wells winner Norrie will play Ruud instead, in his first match of the group stage.

Ruud's first outing ended in a straight-sets defeat at the hands of Djokovic, although the Norwegian may be more confident of his chances in this match, having beaten Norrie 6-0 6-2 in their only other encounter last month at the San Diego Open final.

Tsitsipas - who won the ATP Finals in 2019 - was forced to retire from his Paris Masters clash against Alexei Popyrin last month, also due to an ongoing elbow problem, and the Greek is no longer able to play through the pain.

Norrie is the second alternate to join the competition after an injury to one of the original eight. Jannik Sinner replaced fellow Italian Matteo Berrettini and went on to defeat Hubert Hurkacz in the Red Group on Tuesday.

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

Teenage sensation Carlos Alcaraz put in an impressive display to upstage eighth seed Jannik Sinner in straights sets in the third round of the ATP Paris Masters on Wednesday.

Alcaraz was on top for most of his 7-6 (7-1) 7-5 victory, winning 80 per cent of his first-serve points and 75 per cent of net points against Sinner.

Sinner showed determination to stay in both sets, with the Italian saving nine of the 11 break points he faced, but it was ultimately in vain.

The European Open winner will be among those sweating as the race to qualify for the ATP Finals in Turin heats up.

After the win, 18-year-old Alcaraz said: "I'm so happy for this win as Jannik was fighting for a spot at the ATP Finals. It's my third Top 10 win of the year.

"I think Jannik and I will have a great rivalry in the future... I think that I played really, really aggressive, more than him. I think that was one of the keys."

Alcaraz will now face qualifier Hugo Gaston in the next round after the Frenchman impressively knocked out 12th seed Pablo Carreno Busta 6-7 (3-7) 6-4 7-5.

Interesting day for Turin hopefuls

It was a mixed day for others looking to secure a spot at the season-ending ATP Finals later this month as Felix Auger-Aliassime – ranked 12th in the ATP Race to Turin – lost in straight sets to Dominik Koepfer, who added to his impressive list of victims after beating three-time grand slam champion Andy Murray in the first round.

Koepfer will play another Turin hopeful, the 10th-ranked Hubert Hurkacz after he beat Tommy Paul in straight sets.

Cameron Norrie also impressed in his 6-3 6-4 win over Reilly Opelka, which was his 50th tour-level win of the year.

Taylor Fritz awaits after the American stunned fifth seed Andrey Rublev 7-5 7-6 (7-2).

Medvedev and Zverev ease through but Tsitsipas out

Second seed and US Open champion Daniil Medvedev had a routine first match of the tournament as he swept past Ilya Ivashka 7-5 6-4, while Olympic Games gold medallist and fourth seed Alexander Zverev also had few problems against Dusan Lajovic 6-3 7-6 (7-5).

However, third seed Stefanos Tsitsipas exited after retiring hurt with an apparent arm injury against Alexei Popyrin in the first set with the score at 4-2 to the Australian.

Popyrin will now face fellow countryman James Duckworth, who followed up his impressive win against 14th seed Roberto Bautista Agut with a 6-3 3-6 6-3 victory against Lorenzo Musetti.

Elsewhere, 11th seed Diego Schwartzman was shocked by qualifier Marcos Giron 7-6 (7-2) 7-6 (7-4).

There were also wins for 16th seed Grigor Dimitrov against Karen Kachanov, and Sebastian Korda over Marin Cilic.

Gael Monfils will go up against world number one Novak Djokovic in the third round after the experienced French 15th seed came from behind to beat compatriot Adrian Mannarino 2-6 7-6 (7-4) 6-2.

Top seed Andrey Rublev crashed out of the St Petersburg Open after a straight-sets defeat by Dutch qualifier Botic van de Zandschulp in the quarter-finals.

A recent US Open quarter-finalist, world number 69 Van de Zandschlup claimed the first top-10 win of his career on Friday.

The 26-year-old also advanced to the semi-finals of an ATP event for the first time.

There, he will face 2011 champion Marin Cilic, who was a 6-4 3-6 6-3 winner over third seed Roberto Bautista Agut.

Denis Shapovalov was another big-name casualty in Russia, the second seed going down 4-6 3-6 against world number 53 Jan-Lennard Struff.

Although, there were better fortunes for fifth seed Taylor Fritz. The Indian Wells semi-finalist is yet to drop a set this week after prevailing 6-4 6-2 against John Millman.

Elsewhere, Matteo Berrettini was the victim of another upset at the Erste Bank Open in Vienna.

The Wimbledon champion went down 1-6 7-6 (7-2) 6-7 (5-7) following a two-hour 40-minute battle with Carlos Alcaraz.

Reaching his first ATP 500 semi-final, the Spanish teenager claimed another big scalp having defeated Stefanos Tsitsipas at Flushing Meadows last month.

However, second seed Alexander Zverev remained on course for a fifth title of the season, as he claimed his 300th tour-level win.

The Australian Open finalist beat Felix Auger-Aliassime 6-4 3-6 6-3, avenging his fourth-round defeat by the Canadian at Wimbledon in July.

Alexander Zverev and Jannik Sinner moved into the quarter-finals of the Vienna Open on Thursday. 

Italian Sinner beat home hopeful Dennis Novak 6-4 6-2 to set up a tantalising showdown with Casper Ruud. 

Should he win that match, Sinner will move ahead of Hubert Hurkacz in the race to qualify for this year's ATP Finals, while victory for Ruud will strengthen the Norwegian's standing. 

"It's going to be tricky," said Sinner. "He's in a better position than I am for the race. I think right now it's tough to say and tough to do because in the end you try always not to think about that, but in the end you think about that because you believe." 

Zverev was given a sterner test, eventually overcoming Alex de Minaur 6-2 3-6 6-2 in one hour and 42 minutes. The Olympic gold medallist will now face Felix Auger-Aliassime, who fought back from a set down to defeat Cameron Norrie. 

Frances Tiafoe came from a set down to upset top seed Stefanos Tsitsipas 3-6 6-3 6-4 and earn a quarter-final meeting with Diego Schwartzman after the Argentine overcame Gael Monfils 7-6 (7-5) 4-6 6-2. 

In St Petersburg, home favourite and sixth seed Karen Khachanov lost a gruelling three-set encounter to Marin Cilic. 

The Croatian, who won the title in Russia in his last appearance in 2011, was 4-1 down in the deciding set but took all five of the final games to triumph after two and a half hours on court. 

"Everybody is playing good. The tournament is great. It's the end of the season, so everybody wants to finish on a great level," said Cilic, who next faces Roberto Bautista Agut. "For me, it was great to play this kind of a match today." 

Another Russian, Aslan Karatsev, fell to John Millman 6-3 6-2. Taylor Fritz and Botic van de Zandschulp also progressed in straight sets. 

Stefanos Tsitsipas survived a minor scare in the first round of the Vienna Open before ultimately going on to beat Grigor Dimitrov in straight sets.

It was neck-and-neck for much of the first set, with neither player losing serve, but Dimitrov appeared to have the upper hand when he got to 6-3 in the tiebreak.

Tsitsipas recovered emphatically, however, the top seed reeling off five successive points to win the set and he went on to book his spot in the second round thanks to a 7-6 (8-6) 6-4 victory. He will face Frances Tiafoe next.

"Grigor is a tough competitor and the level of tennis was really high today. We both competed at our highest [level]," Tsitsipas said afterwards.

"That was great tennis that was being played during the entire match and I got really close to my [best] offence and showed incredible attitude [in] the last game, which was the one that was the most crucial of the match."

Alexander Zverev, seeded second, was also made to work in his first-round clash with Filip Krajinovic.

While he blew the Serbian away in the first set, he found himself 5-2 down in the second as Krajinovic looked set to level the match, but Zverev scrapped his way back and then served to love to win 6-2 7-5. Alex de Minaur awaits the German.

Casper Ruud and Felix Auger-Aliassime, seeded fourth and sixth respectively, were two other high-ranking players who also secured progression, boosting their ATP Finals qualification hopes.

Ruud was pushed hard by Lloyd Harris but eventually outfought the South African in his 7-5 7-6 (7-2) win, while Auger-Alisassime made fairly light work of Ricardas Berankis 6-3 6-2.

Indian Wells champion Cameron Norrie, who is also in with a shot of reaching the ATP Finals, beat Marton Fucsovics 7-6 (7-4) 6-1 to set up a meeting with Auger-Aliassime – the British number one is 11th in the FedEx ATP Race to Turin rankings, one above his next opponent.

At the St Petersburg Open, fifth-seed Taylor Fritz was the highest-ranked player in action and he needed a little over an hour to beat Emil Ruusuvuori 6-1 6-4.

Pablo Andujar defeated Federico Delbonis to set up a meeting with second seed Denis Shapovalov, while Ilya Ivashka beat Laslo Djere for the right to tussle with tournament favourite Andrey Rublev next.

Alexander Zverev rued a missed opportunity to win the Indian Wells Masters as he crashed out in the quarter-finals at the hands of home favourite Taylor Fritz.

American Fritz saved two match points to pull off an upset 4-6 6-4 7-6 (7-3) win over Olympic gold medallist Zverev.

Third seed Zverev was aware he had become hot favourite to triumph in California after Stefanos Tsitsipas crashed out to Nikoloz Basilashvili earlier on Friday, with US Open champion Daniil Medvedev already eliminated.

And the German was frustrated with his performance against Fritz, which left him unable to add to the Masters 1000 titles he has already won in Madrid and Cincinnati this year.

"It was just not really my day, to be honest," said Zverev, who had beaten Jenson Brooksby, Andy Murray and Gael Monfils to reach the last eight.

"I was close to winning, but the level of tennis was just not there for me.

"Mentally this is not easy for me. My next tournament is Vienna, so hoping I can deal with it well there, but right now I just want to go home.

"It was a very long season and I have played well but this one hurts because I knew that, after Stefanos lost this morning, I was kind of the favourite to win this tournament, but my tennis wasn't there yet."

Zverev had won 20 of his previous 21 matches on hard courts and led 5-2 in the deciding set.

But Fritz was not to be denied, firing 36 winners to secure the second top-five win of his career, with this triumph adding to impressive victories over Italian duo Matteo Berrettini and Jannik Sinner this week.

Fritz said: "This is the farthest I've ever been in a big tournament. 

"It is easily the best win of my life, against a really tough opponent on arguably the biggest match I could possibly play, so it's great.

"The biggest thing was match point down, I wanted to make him serve it out, so I just fought as hard as I could to hold that game.

"Then I got fortunate in his service game and from there I felt in control and felt really good under the pressure. I kept fighting. The crowd pushing me on meant so much.

"It is amazing. Especially the way that match ended with such high emotions with the crowd. The crowd was amazing and it is a dream come true."

Stefanos Tsitsipas and Alexander Zverev both crashed out in the quarter-finals on a day of upsets at the Indian Wells Masters.

Tsitsipas – the second seed – suffered a shock defeat to Nikoloz Basilashvili in a memorable outing for the Georgian in the Californian desert on Friday.

Afterwards, third seed Zverev was upstaged by Taylor Fritz in another boilover at the ATP Masters 1000 tournament.

BASILASHVILI BANISHES STEFANOS FOR MAIDEN MASTERS SF

In the biggest win of his career, 29th seed Basilashvili conquered French Open runner-up Tsitsipas 6-4 2-6 6-4.

Basilashvili's powerful groundstrokes from the baseline troubled Tsitsipas throughout as he reached his first Masters 1000 semi-final.

Prior to this year, Basilashvili had never won a main-draw match at Indian Wells in four previous appearances.

"I have played really great matches this tournament," said Basilashvili, who is the first Georgian in a Masters 1000 semi-final since Irakli Labadze in 2004. "I was not that happy with how I played today but I was happy with how I managed my stress levels.

"First time in the quarter-finals and it is a big court and Stefanos is a super tough player. I had to keep my physical levels and energy levels in a really good shape because I knew mentally I would be a little bit tight and stressed."

FRITZ SAVES MATCH POINTS TO UPSET ZVEREV

Next up for Basilashvili is 31st seed Fritz, who fended off two match points to surprise Olympic Games gold medallist Zverev 4-6 6-4 7-6 (7-3).

Fritz dropped the opening set and rallied from 5-2 down in the decider as he earned his second top-five victory of his career en route to his first Masters 1000 semi-final.

"I was really down and out but I found a way to put myself into it," Fritz said in his on-court interview. "I really wanted to make him have to close me out and I was able to get back into the match.

"Normally you would be so nervous in those situations and in the third set tie-break, but I felt so confident being aggressive, going after my game. It feels really great to play well with the pressure on."

It is the second Masters 1000 tournament of the season to feature three players in their first semi-final – Basilashvili, Fritz and Cameron Norrie – after the Miami Open.

Daniil Medvedev was ousted from the Indian Wells Masters, the US Open champion and top seed stunned by former world number three Grigor Dimitrov in a thrilling comeback.

Dimitrov had been a set and a double break down against the Russian star on Wednesday, before launching a remarkable rally for his first win over a top-two opponent since 2016.

Meanwhile, second seed Stefanos Tsitsipas and third seed Alexander Zverev both won to secure their spots in the last eight.

MEDVEDEV SHOCKED IN THE DESERT

Dimitrov roared back to triumph 4-6 6-4 6-3 over Medvedev, who had won 18 of his past 19 matches on North American soil.

Bulgarian star Dimitrov trailed 4-1 in the second set after dropping the opener before stunning the first-time grand slam champion midweek.

"I just felt something at 1-4 and I calmed myself down and started to take better decisions and started to control the pace of the game, which I really believed helped me," Dimitrov – the 23rd seed – said. "In the end it was just very solid and smart play."

Dimitrov finished the match with 25 winners, while he was also excellent at the net, helping him claim his first quarter-final appearance at an ATP Masters 1000 event this season.

Medvedev sent down 5-1 aces but only managed a 54 per cent first-serve percentage, while he also faced 10 break points across the match. Dimitrov won five games in a row to claim the second set.

"I don't remember myself losing three service games, even four service games ever, I guess, on hard courts," Medvedev said.

"That shows how slow this court is and the conditions, more like clay, I would say, which I don't like, because to lose serve four times is just unacceptable."

Dimitrov will face eighth seed Hubert Hurkacz in the quarter-finals after he got past Australian Open semi-finalist Aslan Karatsev 6-1 6-3.

Medvedev added: "Grigor played [the] second part of the match better than anybody did against me [at the] US Open that I won. Playing this level, I don't see him losing to anybody, but let's see the result."

ZVEREV MAKES STATEMENT WITH MONFILS WIN

Olympic Games gold medallist Zverev bulldozed his way past 14th seed Gael Monfils 6-1-6-3 en route to the last eight.

German star Zverev claimed his 20th win from his last 21 matches, needing just over an hour to dispatch Monfils.

Zverev claimed 19 of 25 points at the net, hitting 19 winners including 11 with his forehand, while converting four of eight break points.

"I felt well on the court today. Gael is someone I haven't beaten before, so I knew had to play my best tennis and I definitely was not far away," Zverev said during his on-court interview.

Zverev will take on American 31st seed Taylor Fritz, who defeated 10th seed Jannik Sinner 6-4 6-3.

TSITSIPAS OUTLASTS DE MINAUR

French Open runner-up Tsitsipas saw off a tough challenge from Australian Alex de Minaur to secure his spot in the quarter-finals 6-7 (3-7) 7-6 (7-3) 6-2.

Tsitsipas fought back from a set down to win against the 22nd seed, triumphing in two hours, 43 minutes.

Greek star Tsitsipas showed grit to outlast the tiring De Minaur and will face 29th seed Nikoloz Basilashvili after he knocked off fellow seed Karen Khachanov 6-4 7-6 (8-6).

"That was incredible the way I just stayed in the match," Tsitsipas said. "I had to go through so many difficulties in order to find a solution and I executed towards the end of the match."

There were further top-10 casualties, with sixth seed Casper Ruud also bowing out 6-3 6-3 to 11th seed Diego Schwartzman, who will meet Cameron Norrie in the quarters.