Nicolas Jarry says there is "no doubt" he is innocent after the world number 78 was provisionally suspended for an anti-doping violation.

The International Tennis Federation on Tuesday announced the 24-year-old Chilean tested positive for non-specified substances Ligandrol metabolite and Stanozolol metabolite.

Jarry was charged as a result of a urine sample which was taken during the Davis Cup Finals in Madrid last November, but he denies any wrongdoing.

"Last November, while I was playing [in the] Davis Cup for Chile, I underwent two urine tests," Jarry posted on Instagram.

"The first one was clean but the second one detected two banned substances. The levels of these substances are so incredibly low that they are equivalent to trillionths of a gram, levels so low that neither substance could have provided me any performance-enhancing benefit.

"I would like to let you know that I have never deliberately or intentionally taken any banned substance in my career as a tennis player, in fact I am completely opposed to doping.

"Therefore, I dedicate these next days and weeks fully to determine where these substances came from so my legal team and I can clarify the situation completely.

"This has caught me and my loved ones by absolute surprise and what I would like to do beyond proving my innocence (no doubt about that) is to in future use what is happening to me as an example for all young athletes, so that cases like this never happen again.

"I say this because it strongly looks like a cross-contamination cause [from] the use of multi-vitamins made in Brazil, which my doctor recommended I take since they were guaranteed to be free from banned substances.

"My legal team and I will be working very strongly to prove my innocence and for this I have offered my full cooperation to the International Tennis Federation (ITF)."

Seventh seed Jan-Lennard Struff moved safely through to the last 16 of the Adelaide International, while Dan Evans reached the quarter-finals.

Struff was the only seed in action on Tuesday at the first edition of the tournament and he defeated lucky loser Salvatore Caruso 6-4 6-2.

Like Struff, Spaniard Albert Ramos-Vinolas won his first-round match, as did qualifier Tommy Paul and wildcard Alex Bolt.

Evans, meanwhile, is the first man into the last eight after he saw off Alexander Bublik 7-5 6-2.

Inclement weather heavily affected proceedings at the Auckland Open, though there was still time for John Millman to reach the last 16 with a hard-fought 7-6 (7-5) 6-4 win over qualifier Michael Mmoh.

Millman will play Karen Khachanov in round two, with Vasek Pospisil – a winner over Joao Sousa – set to face rising star Denis Shapovalov in an all-Canadian encounter.

Kyle Edmund defeated wildcard Alejandro Davidovich Fokina 6-2 4-6 6-3 in a back-and-forth contest.

Australian Open tournament director Craig Tiley insisted players would not be put in danger amid air quality concerns in Melbourne.

Play was delayed on the opening day of qualifying on Tuesday due to poor air quality caused by bushfires in Australia.

While organisers faced criticism for allowing play to begin, Tiley said players would not be put at risk.

"We reiterated with the players that we're making a decision based on advice, based on expert advice," he told a news conference.

"We're not going to put them in harm's way or make any decision that's going to negatively impact their health and wellbeing.

"We have a track record of that when it comes to extreme heat. I think we're one of the few major events that has to manage extreme heat like we do.

"But this is a new experience for all of us, how we manage air quality and therefore we've got to rely on those experts that advise us on how best to continue."

Slovenian Dalila Jakupovic retired during her qualifier against Stefanie Voegele when leading 6-4 5-6, with reports suggesting she was struggling with her breathing.

Australian Open qualifying was delayed on Tuesday due to poor air quality as smoke from bushfires in Australia impacted Melbourne.

Play was due to get underway at 10:00 local time (23:00 GMT), but thick smoke blanketed Melbourne, leading to it being pushed back by an hour.

Bushfires have ravaged Australia in recent months and there have been concerns over player and spectator welfare at the year's first grand slam, with the main draw beginning on Monday.

The poor air quality has already impacted the event, with the Australian Open announcing practice had also been suspended during the morning on Tuesday.

"Practice was temporarily suspended this morning due to poor air quality," a statement read.

"Qualifying matches will begin at 11am. Conditions onsite are improving and are being constantly monitored.

"Further decisions will be made using onsite data and in close consultation with our medical team, the Bureau of Meteorology and scientists from EPA Victoria.

"As always the health and safety of our players, our staff and our fans is our priority."

Air quality in Melbourne has been in the 'hazardous' and 'very poor' range since midnight local time (13:00 GMT) in readings provided by the Environment Protection Authority Victoria.

Benoit Paire held off a fighting challenge from rising star Jannik Sinner to move into the second round of the Auckland Open, while top seed Alex de Minaur withdrew from the Adelaide International.

At the first edition of the ATP tournament in Adelaide, sixth seed Cristian Garin fell to Lloyd Harris, the South African qualifier winning 7-6 (7-5) 3-6 6-4.

Jeremy Chardy defeated fellow Frenchman Gilles Simon in straight sets, with Dan Evans, Sam Querrey and home hope James Duckworth the other players to progress.

The action came as top seed De Minaur pulled out of the event after aggravating an abdominal injury while representing Australia at the ATP Cup.

"I have seen the physios, I have seen the doctors and I will be continuing to do that for the whole of the week and hopefully I will be ready to play in Melbourne," De Minaur said ahead of the Australian Open.

In Auckland, Italian Sinner – winner of the Next Generation ATP Finals in November – took number five seed Paire to a final set but the Frenchman eventually prevailed 6-4 2-6 6-4 in one hour and 55 minutes.

Defending champion Tennys Sandgren started his campaign with a routine 6-4 6-3 triumph over wildcard Michael Venus.

But last year's beaten finalist Cameron Norrie was knocked out in straight sets by qualifier Thiago Monteiro, with American Frances Tiafoe also being eliminated at the hands of qualifier Mikael Ymer.

Hubert Hurkacz and Ugo Humbert saw off Lorenzo Sonego and Casper Ruud respectively in Monday's other matches.

Novak Djokovic believes there is no clear favourite for the men's singles at the Australian Open and says the 'big three' will be challenged at the opening slam of the year.

The last 12 majors have been shared between Djokovic, Rafael Nadal and Roger Federer, with Stan Wawrinka the last man other than the trio to win a slam at the 2016 US Open.

Djokovic impressed during the inaugural ATP Cup last week, scoring wins over Nadal, Daniil Medvedev and Kevin Anderson en route to helping Serbia to glory.

The 16-time slam winner accepts the usual suspects will be considered favourites in Melbourne, but tipped the likes of Medvedev, Stefanos Tsitsipas and Dominic Thiem to challenge.

"I think it's really open, the Australian Open or any other slam," Djokovic told reporters.

"I don't think there are really clear favourites. You have obviously Federer, Nadal, myself because of the experience and everything and the rankings that we get to be probably named the top three favourites.

"But then you have Medvedev, Tsitsipas, Dominic Thiem that are really showing some amazing tennis.

"They showed that they matured on the big stage, that they can challenge the best players in the world and win against them.

"So, everybody keeps on talking about a NextGen player winning a slam. It seems like it's getting closer. Hopefully not this year. We'll see."

While Djokovic and Nadal have geared up for the Australian Open by playing the ATP Cup, helping Serbia and Spain to the final respectively, Federer opted to stay home and train in his native Switzerland.

Federer insists he has no fitness concerns despite not playing a competitive match since November.

"I've trained long and hard in the off-season and I didn't have any setbacks, which is crucial," Federer said.

On the continued success he, Djokovic and Nadal have enjoyed, Federer added: "I'm aware that at 38 I shouldn't be the favourite, it should be someone probably in their 20s, but the three of us have been able to stay as the favourites, which is great for us.

"Both guys are already showing great signs. I was watching a little bit of their ATP Cup match and thought that was a great match.

"Both guys, injury free, are always tough to beat."

Rafael Nadal feels there needs to be an agreement between the ITF and the ATP to create a single "world cup" as opposed to the separate Davis Cup and ATP Cup.

ATP world number one Nadal starred in Spain's triumph at the Davis Cup - organised by the ITF - in November, but he and his country were on the losing side at the inaugural ATP Cup on Sunday, going down to Novak Djokovic's Serbia.

The Spaniard enjoyed the new tournament but suggested the two competitions were a source of confusion.

"[The ATP Cup] is a long competition. It's a tough way to start the season," Nadal said. "I don't know. I think it's a great competition but, at the same time, I can't change my mind.

"Two world cups in [just over] one month is not real. It's not possible. So, we need to find a way to fix it and we need to find a way to make a big deal with ITF and ATP to create a big world team cup competition, not two world cups in one month.

"I think that's confusing for the spectators. We need to be clear in our sport.

"And for the health of our sport and the benefit of our sport, in my opinion, it is mandatory that we fix it.

"I think it is a great competition. I am excited to be part of it, excited to represent my country.

"I enjoyed sharing the week with my friends on the team. The organisation has been fantastic, honestly, everything as good as possible. Just, in my mind, we need to create one thing and not two."

Meanwhile, Nadal was unhappy with some sections of the crowd in Sydney, where a partisan Serbian contingent roared on rival Djokovic, who beat the world number one 6-2 7-6 (7-4) in the second singles rubber, before joining forces with Viktor Troicki to beat Pablo Carreno Busta and Feliciano Lopez 6-3 6-4 in the doubles decider.

"Honestly, the crowd was fantastic every single day," Nadal continued. "But, sometimes, people from some countries, they probably don't understand how tennis is.

"They think it is more like football, but the atmosphere in tennis is different. The respect for the players should be there. At some point, the respect - from a small part of the crowd - was not there."

Novak Djokovic drove Serbia to glory in the ATP Cup final, sinking Spain with a sublime singles win over Rafael Nadal and a clinical doubles performance.

Tuning up for the defence of his Australian Open title, Djokovic helped Serbia recover from the loss of the first singles rubber, when Roberto Bautista Agut scored a 7-5 6-1 victory over Dusan Lajovic.

With the pressure growing late on Sunday evening in Sydney, Djokovic rose to the occasion against world number one Nadal and landed a 6-2 7-6 (7-4) success for a 29th win in the pair's 55-match career rivalry.

That meant the inaugural edition of this event would be decided on doubles, and while Djokovic returned after a brief break to partner Viktor Troicki for Serbia, Nadal was only a spectator.

Pablo Carreno Busta and Feliciano Lopez lined up for Spain, but they could not resist the Serbian pairing and fell 6-3 6-4, the match ending at 01:05 local time on Monday morning.

An emotional Djokovic said of Serbia's 2-1 triumph: "I'll remember this experience for the rest of my life as it is definitely one of the nicest moments in my career."

Nadal was as intense at courtside as he can be in match action, but he was also essentially powerless to influence the outcome as Davis Cup winners Spain fell short of what would have been a famous double.

Serbia, backed by a large contingent of their supporters roaring approval inside the Ken Rosewall Arena, moved one game away from the trophy after a strong service game from Troicki.

And while Lopez and Carreno Busta staved off the immediate threat, there was never any doubting Djokovic would complete the job once he got ball in hand.

He served out to love, sank to the court, then embraced Troicki before being mobbed by the rest of the Serbia squad.

Djokovic hurled a racket into the crowd, caught by a thrilled female fan, before he and Troicki wrapped themselves in a Serbia flag.

Djokovic said on Amazon Prime: "I've been very fortunate and blessed to have an amazing career in the last 15 years, but playing for the team and playing for the country with some of my best friends for a long, long time, you just can't match that, that's too special."

Troicki explained teaming up with Djokovic had been a treat, saying: "I remember playing with him since we were nine, 10, and to share such a moment with him... I'll remember it for the rest of my life. It's unreal."

Reilly Opelka squandered three match points to join fellow American seed Taylor Fritz in suffering a first-round exit at the inaugural Adelaide International.

Eighth seed Opelka took the first set against Pablo Cuevas and passed up three opportunities in a second-set tie-break before succumbing to a 5-7 7-6 (11-9) 7-6 (7-2) defeat.

Fritz, seeded fifth, slipped to a 6-4 7-6 (7-4) loss to Alexander Bublik, who now owns a 2-0 lead in their head-to-head record having also triumphed in Chengdu last year.

In the day's other match, Laslo Djere needed three sets to defeat Alexei Popyrin.

Novak Djokovic extended his hard-court dominance against Rafael Nadal as he brought Serbia level with Spain in the ATP Cup final.

After Roberto Bautista Agut fended off Dusan Lajovic 7-5 6-1 in the opening rubber, the Sydney crowd saw the world's top two players lock horns in a critical showdown.

Djokovic took it 6-2 7-6 (7-4) for a 29th win in his 55-match rivalry with Nadal, who helped Spain win the Davis Cup last year.

And that meant the inaugural ATP Cup would be decided by a doubles showdown, which was set to get under way after 23:00 local time.

Djokovic and Nadal have played each other more times in singles than any men's tennis rival pairing in the Open era and this latest meeting went largely in keeping with recent trends.

Nadal had won three of their past five matches, but all those wins came on clay, his preferred surface, while Djokovic's successes in the mini sequence came on grass in the 2018 Wimbledon semi-finals and on hard court in last year's one-sided Australian Open final.

Djokovic was made to work harder than the scoreline suggested to take the opening set, and then the world number two withstood severe pressure on his serve in the sixth game of the second set, fending off five break points including three at love-40.

It was Nadal's turn to produce heroics in the 11th game, saving two break points - the first with a volley onto the baseline and the second when lashing a backhand clean winner down the line.

With a large Serbian contingent inside the Ken Rosewall Arena, the crowd favoured Djokovic, yet the match was still in the balance as it went to the second-set tie-break.

Djokovic gave himself a crucial mini break to lead 5-4 though, lancing a backhand out of Nadal's reach. Nadal sliced inches wide and then lashed a forehand into the net, and the rubber belonged to Serbia.

Djokovic said: "Every time I get to play Rafa, we get to play a lot of exciting points. There were some incredible exchanges today. I started off the match perfectly really, everything worked for me.

"I think my serve got me out of trouble in the second set when he was love-40. If he broke my serve at that moment, the match could have easily gone to a third set and it's anybody's game.

"I'm just really glad to hold my nerve in the end."

Andrey Rublev claimed the first ATP Tour title of 2020 by defeating Corentin Moutet 6-2 7-6 (7-3) in the final of the Qatar Open.

Moutet, 20, beat Milos Raonic in the second round and on Friday overcame Fernando Verdasco and top seed Stan Wawrinka in three sets to reach his first final at this level.

However, getting the better of Rublev - the runner-up in 2018 - proved too much of a challenge, with the promising 22-year-old kicking off his season by claiming a third ATP Tour title of his career that will send him into the top 20 for the first time.

Rublev did not drop a single set throughout the tournament and after taking a 6-1 lead in the second-set tie-break against Moutet he did not look like missing out on the trophy.

"It's amazing. For the moment I have no words. I'm always really happy to play here and to win a title here is something special for me. It's an amazing start to the season and I can hope to continue the same level," Rublev said in his on-court interview.

"There's still much to work on, but I'm happy to become a top-20 player. I still have huge room to improve and I want to try to my maximum and see what happens."

Serbia and Spain both prevailed in the ATP Cup to set up a dream final that could see Novak Djokovic face Rafael Nadal.

Having won all three matches of their quarter-final tie with Canada in the quarter-finals, Serbia again remained unbeaten versus Russia, while Spain dispatched hosts Australia with successive singles wins.

Reigning Australian Open champion Djokovic came through an engrossing three-setter with US Open finalist Daniil Medvedev.

Djokovic had lost his last two meetings with Medvedev, who threatened a comeback in Sydney after he recovered from a hugely disappointing first set to force a decider.

The world number two struck the ultimately decisive break in the fifth game of the third. However, typically obdurate to the end, Medvedev had three break-back points before Djokovic finally took his second match point.

It finished, fittingly, with the type of lengthy baseline rally that defined a captivating contest, Medvedev firing a cross-court forehand into the net to give Serbia an unassailable 2-0 lead with a 6-1 5-7 6-4 victory.

Earlier Dusan Lajovic beat Karen Khachanov 7-5 7-6 (7-1), and Serbia also came through in the dead rubber doubles clash as Nikola Cacic and Viktor Troicki defeated Teymuraz Gabashvili and Konstantin Kravchuk.

Paying tribute to Medvedev, Djokovic said of the match: "[It was] exciting, exhausting, joyful, dreadful all at once. At one point we both refused to miss from the baseline, so it was a lot of rallies and it was very exhausting. A very physical battle, but also a mental battle.

"He showed why he's one of the best players in the world, why he's top five. This kind of consistency and this kind of solid game from back of the court, big serves, got him to where he is. He deserves to be there.

"[It was] definitely one of the most exciting matches I have played against him or any other top player in the last few years."

World number one Nadal was similarly tested by Alex de Minaur, whose energy and intensity had the home crowd in Sydney on their feet as he took the first set in his quest to level the tie after Roberto Bautista Agut easily beat Nick Kyrgios 6-1 6-4.

US Open champion Nadal did not have a break point until the 12th game of the second, but he took it to force a decider and subsequently raced away to claim a 4-6 7-5 6-1 success.

Wary of the obvious threat posed by Djokovic and Serbia in the final, Nadal said on court: "It's going to be a super tough final against Serbia.

"Novak likes to play here and Serbia has a great team and is playing very well. But Roberto played an amazing match this afternoon and we have a good team, so we are ready for it."

World number two Novak Djokovic has withdrawn from the Adelaide International.

The 16-time grand slam champion was scheduled to play at the inaugural edition of the event ahead of the Australian Open, but his withdrawal was announced on Saturday.

Djokovic, 32, has been in action for Serbia at the ATP Cup, winning all five of his singles matches to help his nation into the final.

Adelaide International tournament director Alistair MacDonald said: "We understand his decision and wish him the very best of luck for the remainder of the ATP Cup and the upcoming Australian Open."

A record seven-time Australian Open champion, Djokovic will again enter the tournament in Melbourne as one of the favourites.

The Australian Open begins on January 20.

Juan Martin del Potro will miss the upcoming Australian Open as he continues his recovery following knee surgery.

Del Potro, 31, is yet to return to the ATP Tour since undergoing surgery in June last year in the latest setback of an injury-ravaged career.

The 2009 US Open champion's comeback will not come at Melbourne Park, with his withdrawal from the year's first major confirmed on Saturday.

"Our two-time quarter-finalist Juan Martin del Potro has withdrawn from #AusOpen 2020 as he continues to recover from a knee injury," the tournament announced via its official Twitter account.

"Wishing you all the best with your recovery @delpotrojuan. We hope to see you back in Australia soon."

Del Potro has played just one Australian Open since 2015, reaching the third round two years ago.

He missed three of the four grand slams last year, having looked to be nearing his best again in 2018, when he reached the US Open final, French Open semis and Wimbledon quarters.

The 2020 Australian Open starts on January 20.

Rafael Nadal aimed a verbal volley at ATP Cup organisers by saying Spain were dealt a rough hand for their Final 8 clash with Belgium.

The world number one suffered a shock 6-4 7-6 (7-3) defeat to David Goffin in the second singles rubber, after Roberto Bautista Agut overcame Kimmer Coppejans in the opener.

Nadal and Bautista Agut later scrambled a 6-7 (7-9) 7-5 10-7 doubles victory over Sander Gille and Joran Vliegen to carry Spain through to the semi-finals.

The inaugural ATP Cup saw its pool matches split between Sydney and Brisbane on the Australian east coast, and Perth on the west coast, which is where Spain were initially stationed.

The tournament's final stages are being held in Sydney, though, and that meant a long journey for Spain, and a quick turnaround once they arrived in Australia's largest city.

Nadal paid Goffin a compliment by saying: "David played a great match, better than me."

But the 19-time grand slam winner made it clear he was not happy, saying the humidity inside the Ken Rosewall Arena should have been taken into account, pointing to the ventilation technology available to make conditions more comfortable for players.

"I was suffering a lot physically today," Nadal said.

"It was big humidity, but at the same time it’s fair to say we were in the worst position to play the Final 8, because we came from Perth. That is a three-hour time change, different weather conditions, playing against a team that have been here for the last 10 days and we are the only team coming from Perth and playing until the last day of Perth.

"And arriving here at two in the evening with jetlag, with everything, and today we had very heavy conditions out there.

"So probably we had the worst situation possible to play this tie."

Spain survived though, setting up a clash with hosts Australia in the final four on Saturday.

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