Nick Kyrgios pulled out of the Sydney Tennis Classic due to testing positive for coronavirus shortly before he was due to face Italy's Fabio Fognini.

The Australian had been one of the tournament's major draws as the home favourite but now cannot compete and that has subsequently thrown his Australian Open participation into question.

Fognini took full advantage of the situation as he saw off lucky loser Daniel Altmaier 6-3 7-5 to move into the second round.

There he will be joined by – among others – David Goffin, with the Belgian winning a game for the first time in eight months as he beat Facundo Bagnis 6-4 6-4 after an injury-ravaged 2021.

Fifth-seed Lorenzo Sonego was the highest seed in action and he was made to work hard for his 3-6 6-3 7-5 win over Hugo Gaston, needing almost two hours and 45 minutes to get the job done.

The day's other game saw Jordan Thompson win on home soil, beating Marcos Giron fairly comfortably 6-4 6-2.

At the Adelaide International 2, Tommy Paul came out on top in the battle of the Americans as he cruised to an impressive 6-2 6-3 win over Frances Tiafoe in just 69 minutes.

Local boy Aleksandar Vukic clinched the biggest scalp of his professional career as the world number 156 – a wild card entry for the tournament – beat Alexander Bublik 7-6 (7-5) 6-2.

Arthur Rinderknech and Jaume Munar also progressed, the latter defeating Australia's John Millman.

Rafael Nadal saw off Maxime Cressy in straight sets in Sunday's Melbourne Summer Set final to land the 89th singles title of his career.

The world number six, playing in his first tournament in five months due to injury, has now won at least one ATP Tour trophy in every season since 2004 onwards.

American qualifier Cressy more than held his own in a first set that went the distance, though Nadal's quality told as he prevailed 7-6 (8-6) 6-3 at Rod Laver Arena, where Nadal will be hoping to go deep in the season's first grand slam later this month.

Both men held in an entertaining opening set and Cressy led 6-5 in the tie-break, but he squandered his set point and Nadal hit back to grab a foothold on the match.

The 35-year-old, who won the tournament without dropping a single set, recovered from a break down in the second to add yet another trophy to his vast collection.

Nadal, who had not played since August before coming into this tournament and had COVID-19 last month, had not previously captured a title in Australia since 2009 when landing his only Australian Open triumph to date by beating Roger Federer.

And the Spaniard looks in good shape heading into the Australian Open, which may not feature defending champion Novak Djokovic, who is awaiting the outcome of a hearing to determine whether he will be able to compete in Melbourne.

"I feel privileged and a very lucky guy to be here again," Nadal said in his on-court interview.

"I am coming back from some challenging moments in terms of injuries, so I can't be happier. It means a lot to be back and with a trophy in my hands.

"This court has always been very, very special for me. The Rod Laver Arena is very, very special for everyone and it is more special because of you guys. You guys are a great crowd and I can't thank you enough."

Elsewhere on Sunday, Gael Monfils also made a promising start to the 2022 season with a 6-4 6-4 victory over Karen Khachanov in the Adelaide International 1 final.

Khachanov battled past former US Open champion Marin Cilic in the semi-finals, but he fell short of clinching a first title in over three years.

Top seed Monfils held throughout the opening set and found a breakthrough in the 10th game, with the second set following an identical pattern.

The Frenchman did not drop a set all tournament on his way to winning a first trophy since February 2020 in Rotterdam.

Rafael Nadal fended off a battling Emil Ruusuvuori to reach the Melbourne Summer Set final as the Spanish veteran bids to land the 89th singles title of his stellar career.

Nadal, who has won at least one ATP Tour tournament in every season from 2004 onwards, will look to extend that streak into a 19th year after scoring a 6-4 7-5 win on Rod Laver Arena.

He has not captured a title in Australia since 2009, when he landed his only Australian Open triumph to date by beating Roger Federer.

Nadal will be a strong favourite against American qualifier Maxime Cressy in Sunday's final, despite being made to work hard to see out victory over 22-year-old Ruusuvuori.

The 35-year-old Mallorcan looked set for a routine win but dropped serve at 5-3 in the second set, allowing world number 95 Ruusuvuori a path back into the contest.

It provided Nadal with a test of resolve that he came through, tying up victory in an hour and 56 minutes, an encouraging sign as he continues to battle for full sharpness after a near five-month absence.

Nadal acknowledges he may not have long left in tennis, and he wants to make the most of the opportunities that remain.

"I just love what I'm doing," he said in an on-court interview. "I always feel passionate about the sport in general and I feel a very lucky person that I can live from one of my hobbies, tennis.

"I know it's not forever and it's not a job I'm going to do for 50 years, but I want to enjoy it as much as I can while I still have the chance."

The foot injury that caused the 20-time grand slam winner to curtail his 2021 season in August has not prevented him finding winning form this week and now Paris-born Cressy awaits, with the 24-year-old world number 112 enjoying a remarkable week.

Cressy was a 7-5 7-6 (11-9) winner on Saturday against Bulgarian third seed Grigor Dimitrov, serving 17 aces on the way through to his first ATP Tour final.

At the Adelaide International 1 event, Gael Monfils will face Karen Khachanov for the trophy.

Top seed Monfils ended the spirited run of Australian wildcard Thanasi Kokkinakis, earning a 7-5 6-0 semi-final win, while second seed Khachanov battled past former US Open champion Marin Cilic 7-6 (7-3) 6-3.

Rafael Nadal was handed a walkover to the semi-finals of the Melbourne Summer Set tournament when his opponent withdrew with a foot injury.

In an ironic development, given Nadal has been so plagued by his own serious foot problems, Tallon Griekspoor had to pull out of his scheduled clash with the 20-time grand slam champion on Friday.

That was perhaps not the news Nadal wanted, given the Spaniard is competing this week to gain much-needed match practice ahead of the Australian Open. It is his first ATP Tour event since August, when a long-existing left foot problem caused him to curtail his season.

Withdrawing from a Rod Laver Arena tussle with Nadal was a painful blow to 25-year-old Dutchman Griekspoor too, and he wrote on Twitter: "These are the matches you play for."

It would have been a first career meeting with all-time great Nadal for the world number 65, who instead faces a fitness battle before the first grand slam of the year begins on January 17.

Nadal will go on to face Finland's Emil Ruusuvuori, who won 6-2 6-1 against Slovakian Alex Molcan. The other semi-final on Saturday will see Bulgarian third seed Grigor Dimitrov tackle American qualifier Maxime Cressy.

At the Adelaide International, the top three seeds sauntered through to the semi-finals. Top seed Gael Monfils brushed aside Tommy Paul 6-4 6-1, number two Karen Khachanov saw off Egor Gerasimov 7-5 6-3, and third seed Marin Cilic was a 6-3 6-2 winner over Laslo Djere.

It was also confirmed on Friday that former world number one Andy Murray has been awarded a wildcard into next week's Sydney Classic.

Murray suffered a first-round exit in Melbourne and is looking for a run of matches before launching his campaign at the Australian Open, where he is a five-time runner-up.

Rafael Nadal declared his first singles match on the ATP Tour for five months a roaring success after the Spaniard battled past Ricardas Berankis in Melbourne.

A 6-2 7-5 win for Nadal over the Lithuanian qualifier carried the 35-year-old into the quarter-finals of the Melbourne Summer Set tournament.

Playing on Rod Laver Arena, the main show court for the upcoming Australian Open, top seed Nadal was tested by Berankis but came through unscathed, breaking serve to love to clinch the victory.

This was the first time that Nadal had faced Berankis, the world number 104 who briefly entered the top 50 five years ago, and it came as the 20-time grand slam winner battles back from the left foot injury that curtailed his 2021 season.

Nadal had not competed on tour since losing to Lloyd Harris in the third round in Washington in August, and the match practice he gained at an exhibition event in Abu Dhabi last month was followed by him contracting COVID-19.

He is vaccinated though, so was able to travel once he recovered from that brush with coronavirus, and is looking to build up form and fitness before the Australian Open begins.

"Honestly, I've been going through some difficult, challenging moments the last year and a half, but in general terms I'm super happy to be back in competition," Nadal said.

"It's important to start with a victory. It gives me the chance to play another time tomorrow and that's the main thing at this moment because I didn't play for such a long time.

"The main thing is being healthy. That's probably the only thing."

Awaiting Nadal in the last-eight stage will be Dutch player Tallon Griekspoor, who fended off Australia's Alexei Popyrin in three sets.

Determined not to take on too heavy a workload, Nadal has pulled out of the doubles tournament, despite making a winning start on Tuesday when he paired up with fellow Spaniard Jaume Munar.

He elected to play doubles initially to build up some rhythm. "In doubles, things always happen fast," Nadal said. "It makes you feel alive on the tour again. I think that was a positive thing."

Third seed Grigor Dimitrov advanced, seeing off Andy Murray's conqueror Facundo Bagnis in three sets, but Belgian fourth seed David Goffin slumped to a 7-5 6-3 loss against Slovakian Alex Molcan.

At the Adelaide International 1 tournament, there were wins at the last-16 stage for the top three seeds – Gael Monfils, Karen Khachanov and Marin Cilic – but fourth seed Frances Tiafoe was caught out by Australian Thanasi Kokkinakis, losing in three sets.

Ricardas Berankis will face Rafael Nadal in the second round of the Melbourne Summer Set after beating Marcos Giron on Wednesday.

Nadal made his return after a five-month absence due to injury when he and fellow Spaniard Jaume Munar beat Sebastian Baez and Tomas Martin Etcheverry 6-3 3-6 10-4 in a doubles match in Melbourne on Tuesday.

The 20-time grand slam champion will be back in singles action against Berankis at Rod Laver Arena on Thursday after the Lithuanian qualifier dispatched American Giron 7-5 6-4.

Fifth seed Benoit Paire was trailing 4-6 6-3 5-2 to Henri Laaksonen when the Frenchman retired from the contest.

Alexei Popyrin and Jordan Thompson advanced on home soil, beating Stefano Travaglia 7-6 (7-5) 6-3 and Christopher O'Connell 1-6 7-5 6-4 respectively.

Munar beat towering South African Kevin Anderson 6-4 6-4, while Emil Ruusuvuori, Alex Molcan and Maxime Cressy also made it through.

Marin Cilic racked up the 550th victory of his career at the Adelaide International 1, defeating Thiago Monteiro 6-4, 7-6 (7-3).

Third seed Cilic will now come up against Laslo Djere, who was level at one set apiece with Corentin Moutet when the Frenchman was disqualified after reportedly swearing at the umpire.

Thanasi Kokkinakis fought back to oust Frances Tiafoe in the final match of the day, the Australian wild card winning 3-6 7-5 6-1.

Andy Murray stumbled out of the Melbourne Summer Set tournament after a first-round defeat to Argentinian Facundo Bagnis.

In his opening ATP Tour match of the year, three-time grand slam winner Murray slipped up 6-3 5-7 6-3 against Bagnis, a player who began the year with a 30-59 win-loss career record.

Left-hander Bagnis rose to the occasion on Rod Laver Arena to earn the scalp of the former world number one.

Murray, down at 134th in the rankings after another injury-hit year, is looking to make headway on that front in 2022 under new coach Jan de Witt, so that he can avoid having to take wildcards into tournaments.

He was allowed into this tournament by that back-door route, and has also been confirmed for an Australian Open wildcard, but the Scot could not find the form that saw him beat Rafael Nadal at an exhibition event in Abu Dhabi in late December.

Bagnis said of his win: "In the beginning it was a pleasure to play against Andy and right now to beat him is amazing. I'm really happy."

He added, according to the tournament website: "Yesterday, I came to see the stadium, to see it all around because the atmosphere is different when you play on any court outside… I enjoyed it a lot. It was so good for me."

Nadal was also back in action on Tuesday, playing his first match on the main tour since August as he teamed up with fellow Spaniard Jaume Munar for a doubles win.

A foot injury meant Nadal's 2021 season ended early, but he warmed up for singles tests that lie ahead by joining Munar for a 6-3 3-6 10-4 win over Argentinians Sebastian Baez and Tomas Martin Etcheverry.

At the Adelaide International 1 tournament, there was a notable first-round win on Tuesday for Australian Thanasi Kokkinakis, who saw off compatriot John Millman 6-4 6-3.

Kokkinakis, a major talent as a youngster, is battling to reassert himself on tour after injury troubles, and beating Millman put his name up in lights for at least one day.

He reflected afterwards on the battle it has taken so far, with last year spent largely living out of a suitcase on the second-tier Challenger Tour.

"It was a gruelling year travelling," said Kokkinakis. "I've played a couple of times [in Adelaide] but just in exhibitions, so to play a real meaningful tournament and beat such a quality opponent, a proven veteran like Johnny, means a lot. I played great, and the support was great, so I'm really happy."

Laslo Djere and Soonwoo Kwon began 2022 by cruising through the opening round of the ATP Adelaide International, both earning straight set wins to reach the round of 16. 

Number seven seed Djere beat Spaniard Roberto Carballes Baena 7-5 7-6 (7-1) on the hard surface, while eighth seed Kwon comfortably saw off Japan's Yoshihito Nishioka 6-1 6-2.

Elsewhere, Thiago Monteiro earned an entertaining 6-2 3-6 7-6 (7-2) win over Daniel Altmaier, and the Brazilian will now face number three seed Marin Cilic in the round of 16 after the 2014 US Open champion was given a first round bye.

The other encounter on Monday saw Steve Johnson come through in three sets against wildcard Aleksandar Vukic, 6-4 2-6 6-4. The American will go up against second seed Karen Kachanov in the last 16.

Two-time Grand Slam semi-finalist Gael Monfils is the top seed for the ATP 250 tournament, with Cilic, Khachanov and Frances Tiafoe among the other big names who will enter the competition in the next round.

Rafael Nadal is set to start his 2022 season at the Melbourne ATP 250 ahead of the Australian Open.

Nadal this week appeared on the entry list for the first grand slam of the year, which begins on January 17.

The Spaniard has not featured on the ATP Tour since August, when he lost against Lloyd Harris at the Citi Open in Washington D.C.

But Nadal is going to be back into the swing of things in the next month. The Melbourne 250 starts on January 4 and will serve as a warm-up for the Australian Open.

Gael Monfils is headlining the ATP 250 event in Adelaide during the same week, while Novak Djokovic – whose participation at the Australian Open is as of yet unclear, although he is also listed for entry – is set to lead Serbia at the ATP Cup in Sydney. 

Djokovic has not yet revealed his COVID-19 vaccination status. If he is not fully vaccinated, the 34-year-old may not be able to compete in Melbourne, barring a medical exemption.

Nadal has dropped down to world number six after another injury-hit season, in which he won two titles, triumphing in Barcelona and Rome.

He has only won the Australian Open once, in 2009, but has since been beaten four times in the final, in 2012, 2014, 2017 and 2019.

Since the start of the 2020 season, Nadal has played in four finals, winning them all, including last year's delayed French Open.

Marin Cilic won his 20th title on the ATP Tour by battling past Taylor Fritz in the final of the St Petersburg Open on Sunday.

A decade on from lifting the trophy for the first time, Cilic outlasted his American opponent 7-6 (7-3) 4-6 6-4 in a gruelling contest lasting two hours and 23 minutes.

It took the Croatian to four tournament wins on Russian soil, the 33-year-old having also twice won the crown in Moscow, while it also saw him join truly elite company in the men's game.

Only five other active male players have won 20 or more titles: Roger Federer (103), Rafael Nadal (88), Novak Djokovic (85), Andy Murray (46) and Juan Martin del Potro (22).

"Coming 10 years after winning in 2011 and also winning now, it's so, so special for me, especially this part of my career," said Cilic. "Having now a family, two sons, I want to absolutely dedicate this trophy to my newborn son."

Cilic had the chance to reach 20 titles last week in Moscow, only to lose in straight sets to home favourite Aslan Karatsev.

With 12 aces and 78 per cent of first-serve points won, the former world number three was aggressive in his efforts to make sure this was not another missed opportunity.

After taking the first set, Cilic twice led by a break in the second but allowed Fritz to level the contest and keep alive his hopes of a first title since Eastbourne two years ago.

Fritz went a break ahead in the decider but Cilic battled back to level at 4-4. A double fault from the world number 28 gave Cilic the chance to serve out the contest, and he duly obliged, converting his first match point with a volley.

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. 

Jannik Sinner continued his push for an ATP Finals spot with a straight-sets defeat of Reilly Opelka in the first round of the Vienna Open, while Carlos Alcaraz exacted revenge on Andy Murray.

Sinner won his fourth title of what has been an outstanding season for the Italian in Antwerp last weekend and is only 110 points adrift of Hubert Hurkacz in the battle for the final place in the season-ending event in Turin.

Murray did the 20-year-old a favour by knocking Hurkacz out of the ATP 500 tournament in the Austrian capital on Monday and seventh seed Sinner eased to a 6-4 6-2 win over American Opelka two days later.

Sinner, who will overtake Pole Hurkacz if he reaches the semi-finals this week, won 93 per cent of points behind his first serve and did not face a break point in a resounding win and will play Dennis Novak in the second round.

Murray beat Alcaraz at Indian Wells this month, but the 18-year-old rising star from Spain turned the tables on the three-time grand slam champion with a 6-3 6-4 second-round win in Vienna.

Former world number one Murray struggled with his serve and was broken five times as he made an early exit.

Third seed Matteo Berrettini beat Nikoloz Basilashvili 6-7 (5-7) 6-2 6-3 to reach the third round, while Diego Schwartzman, Gael Monfils and Lorenzo Sonego moved into the second round.

In the St Petersburg Open, defending champion Andrey Rublev beat Ilya Ivashka 6-4 6-4 to reach the quarter-finals along with Denis Shapovalov, a 2-6 6-3 6-0 winner against Pablo Andujar.

Jan-Lennard Struff also moved into the last eight, with Karen Khachanov and Marin Cilic securing first-round wins.

The top two seeds will do battle in the European Open final following commanding victories for Jannik Sinner and Diego Schwartzman on Saturday.

Sinner, the number one seed, moved into his fifth final of the season with a 6-2 6-2 defeat of Lloyd Harris in Antwerp.

The 20-year-old Italian, who is in the hunt for a maiden ATP Finals spot, dominated Harris from the baseline and saved all three break points he faced.

There were only 16 unforced errors from the racket of the composed Sinner, who will be bidding to win his fourth title of the season on Sunday.

Sinner said: "I am very happy to be in the final. I just love playing here and love playing indoors, so hopefully I can play a great match again tomorrow."

Schwartzman ended 20-year-old American Jenson Brooksby's impressive run with a 6-4 6-0 victory.

The Argentinian struck 15 winners and secured five breaks as he marched into the championship match.

Russian second seed Aslan Karatsev will come up against Marin Cilic in his first final on home soil after knocking compatriot Karen Khachanov out of the Kremlin Cup.

Karatsev beat Khachanov 7-6 (9-7) 6-1, while sixth seed Cilic – a two-time winner of the tournament in Moscow – got the better of Ricardas Berankis 6-3 6-4.

Jenson Brooksby enhanced his growing reputation and set up showdown with Diego Schwartzman in the European Open semi-finals.

The 20-year-old American, who took a set off Novak Djokovic and rattled the world number one at the US Open, is shaping up as potentially his country's biggest hope for the future in the men's game.

Californian Brooksby crushed Spain's world number 44 Alejandro Davidovich Fokina 7-5 6-0, and second seed Schwartzman awaits after the Argentinian took down another 20-year-old American, Brandon Nakashima, scoring a 6-4 6-2 quarter-final win.

Schwartzman is the man who ended Andy Murray's hopes at the tournament in Antwerp.

Brooksby, who had to win two qualifying matches to reach the main draw, said: "Tomorrow will be a great match. I'm really looking forward to it. I'll get some rest tonight and get ready to battle again tomorrow."

The other semi-final will see Italian top seed Jannik Sinner take on South African seventh seed Lloyd Harris following their respective straight-sets wins over Arthur Rinderknech and Marton Fucsovics.

There will be an all-Russian semi-final at the Kremlin Cup in Moscow, after Aslan Karatsev and Karen Khachanov won through to the final four.

Second seed Karatsev sank the hopes of Frenchman Gilles Simon, breaking serve five times on the way to a 6-4 6-3 win, while third-seeded Khachanov edged out Australian John Millman. A 7-5 7-6 (7-4) grind featured 19 aces by Khachanov, the 2018 Kremlin Cup champion, who saved four set points in the second set.

Marin Cilic thrashed Pedro Martinez 6-1 6-2 to set up a tussle with Ricardas Berankis, the Lithuanian ending Adrian Mannarino's run with a 6-2 7-6 (7-1) success. Frenchman Mannarino had stunned Russian top seed Andrey Rublev in the previous round.