Rafael Nadal continued his tremendous form as he beat Daniil Medvedev in straight sets to set up a final with Cameron Norrie at the Mexican Open.

Nadal found this victory over Medvedev to be more straightforward than his remarkable five-set comeback win in last month's Australian Open final between the pair, winning 6-3 6-3 in Acapulco.

The victory means the Spaniard moves on to 14-0 for the new season, which is already his best ever start to a year.

The soon-to-be world number one Medvedev at least made him work for it in the second set and earned 11 break points across two consecutive service games, but a determined Nadal rescued all 11 of them, including seven in a marathon nine-deuce game at 6-3 3-2.

"I played some amazing points on the break points," said Nadal following the win. "The second set was very emotional. Daniil was playing very aggressive – drop shots, winners. It was a very difficult set. I feel lucky to win that set because he had a lot of chances."

He will now face sixth seed Norrie on Sunday, who also came through his semi-final against third seed Stefanos Tsitsipas in straight sets, 6-4 6-4.

The Brit – who won the Delray Beach Open last week – was particularly impressive on his serve, making 92 per cent of his first serves in the opening set. That dropped to 57 per cent in the second, but the quality of his baseline shots took him to victory.

Meanwhile at the Chile Open, local wildcard Alejandro Tabilo continued his good run, having already knocked out top seed Cristian Garin, with a 6-1 6-4 win over sixth seed Miomir Kecmanovic.

Tabilo will face Pedro Martinez in the semi-finals after the Spaniard won 6-2 6-2 over Yannick Hanfmann.

Sebastian Baez will meet second seed Albert Ramos Vinolas in the other semi-final after he got past Facundo Bagnis 7-5 6-2.

Russia's Andrey Rublev wrote "no war please" on a camera lens as he joined compatriot Daniil Medvedev in calling for peace.

Rublev beat Hubert Hurkacz 3-6 7-5 7-6 (7-5) on Friday to progress to the final of the Dubai Tennis Championships.

After confirming his place in a showdown with Jiri Vesely, the 24-year-old world number seven took a pen and scribed "no to war" on the lens of a television camera.

Vesely later wrote 'no war' on a camera lens after defeating Denis Shapovalov to book his place in the final.

It is not uncommon for players to write messages on camera lenses, but a plea for peace was an emotive move from Rublev.

On Thursday, Russia invaded neighbouring Ukraine following weeks of rising political tensions. The conflict escalated further still on Friday, with reports of fighting within the capital city of Kyiv.

Rublev's actions came after Medvedev – who will succeed Novak Djokovic as world number one next week – said he wanted to "promote peace".

Medvedev has reached the final four of the Mexican Open in Acapulco.

Rublev had previously expressed his wish for peace in a news conference at the Dubai event.

"In these moments you realise that my match is not important," Rublev said, with a video clip shared to his official Instagram account.

"It's not about my match, how it affects me. What's happening is much more terrible.

"You realise how important it is to have peace in the world and to respect each other no matter what, to be united. 

"We should take care of our Earth and of each other. This is the most important thing."

Russia's Andrey Rublev wrote "no to war" on a camera lens as he joined compatriot Daniil Medvedev in calling for peace.

Rublev beat Hubert Hurkacz 3-6 7-5 7-6 (7-5) on Friday to progress to the final of the Dubai Tennis Championships.

After confirming his place in a showdown with either Denis Shapovalov or Jiri Vesely, the 24-year-old world number seven took a pen and scribed "no to war" on the lens of a television camera.

It is not uncommon for players to write messages on camera lenses, but a plea for peace was an emotive move from Rublev.

On Thursday, Russia invaded neighbouring Ukraine following weeks of rising political tensions. The conflict escalated further still on Friday, with reports of fighting within the capital city of Kyiv.

Rublev's actions came after Medvedev – who will succeed Novak Djokovic as world number one next week – said he wanted to "promote peace".

Medvedev has reached the final four of the Mexican Open in Acapulco.

Rublev had previously expressed his wish for peace in a news conference at the Dubai event.

"In these moments you realise that my match is not important," Rublev said, with a video clip shared to his official Instagram account.

"It's not about my match, how it affects me. What's happening is much more terrible.

"You realise how important it is to have peace in the world and to respect each other no matter what, to be united. 

"We should take care of our Earth and of each other. This is the most important thing."

 New world number one Daniil Medvedev said he wants to "promote peace all over the world", after the Russian achieved a career highlight amid the crisis in Ukraine.

Medvedev's 6-2 6-3 victory over Japan's Yoshihito Nishioka saw him advance to the final four of the Mexican Open in Acapulco on Thursday, where he will face Rafael Nadal in a repeat of last month's Australian Open final classic.

The Russian advanced shortly after Novak Djokovic's shock loss to Jiri Vesely at the Dubai Tennis Championships, which ensured that he will start next week atop the ATP world rankings for the first time.

The news came shortly after Russian president Vladimir Putin launched a military assault on neighbouring Ukraine, an act that has attracted condemnation from across the sporting world.

"Watching the news from home, waking up here in Mexico, was not easy," Medvedev told reporters.

"By being a tennis player, I want to promote peace all over the world. We play in so many different countries. I've been in so many countries as a junior and as a pro. 

"It's just not easy to hear all this news. I'm all for peace. In these moments, you understand that tennis sometimes is not that important. 

"It was not easy to play and I'm happy that I managed to win the match, but it was a bit of a rollercoaster day for me."

Medvedev's compatriot Andrey Rublev had earlier spoken out in favour of peace, calling the situation "terrible" in an Instagram post.

"In these moments you realise that my match is not important," Rublev's post read. "It's not about my match, how it affects me. What's happening is much more terrible.

"You realise how important it is to have peace in the world and to respect each other no matter what, to be united. 

"We should take care of our Earth and of each other. This is the most important thing."

Rublev teamed up with Ukrainian Denys Molchanov to win the Open 13 Provence doubles title in Marseille just days ago, having also won the singles title at the tournament in southern France.

New world number one Daniil Medvedev says Friday's Mexican Open semi-final against Rafael Nadal is his "chance to get my revenge" after last month's epic Australian Open defeat.

Medvedev progressed to the final four in Acapulco on Thursday with a routine 6-2 6-3 victory over Yoshihito Nishioka, while Nadal triumphed 6-0 7-6 (7-5) over Tommy Paul to set up their semi-final meeting.

The Russian's win capped a fine day after Novak Djokovic's loss to Jiri Vesely at the Dubai Tennis Championships meant he would next week become the new world number one for the first time in his career.

Before then, however, Medvedev must take on Nadal in Acapulco, with the pair having not faced off since last month's epic Australian Open decider, where the Spanish fought back from two set downs to clinch a record-breaking 21st major title.

"It’s always special to play against him,” Medvedev said following his win over Nishioka. “Kind of a chance to get my revenge.

“I have to learn from the best, which is him, Roger [Federer], Novak [Djokovic], Andy [Murray]. Always when they were losing a tough fight, they were trying to get their revenge. Sometimes they managed to do it, sometimes not. That’s what I’m going to try to do if I play Rafa."

Medvedev revealed he did not realise that Djokovic's loss would mean he would become number one until he started receiving congratulatory messages on Thursday.

"It’s not easy to play a match when you get this news during the day," Medvedev said.

"The first goal for me was to still win today because I’m here to try to win every match I play. But it’s definitely some great news."

Nadal was full of praise for the new world number one, admitting his excitement at their re-match.

The Spaniard prevailed in five hours and 28 minutes over Medvedev in Melbourne, winning 2-6 6-7 (5-7) 6-4 6-4 7-5 and was ready for the re-match.

"Everybody knows how difficult it is to play against Daniil," Nadal said after Thursday's win over Paul.

"I know I have to play at my highest level if I want to have any chance, and that's what I'm going to try. I have to play my game.

"Everybody knows how difficult the final was in Australia. Tomorrow is going to be another battle.

"I know he's playing well, plenty of confidence... I am excited to play that match."

Rafael Nadal set up a semi-final meeting with new world number one Daniil Medvedev after cruising past Tommy Paul 6-0 7-6 (7-5) at the Mexican Open in Acapulco on Thursday.

The Spanish fourth seed, who won last month's Australian Open against Medvedev in a five-set epic for a record-breaking 21st Grand Slam title, beat the American in two hours and three minutes.

Nadal was at his tenacious best early, winning the first set 6-0 for the second consecutive match, before Paul hit back in the second.

The Spaniard dropped only 10 points in the opening set with errors creeping into his game early in the second set allowing Paul to get 2-1 up a break.

The pair exchanged a string of four games against serve, with Nadal breaking again with Paul serving for the set, before triumphing in the tie-break.

Top seed Medvedev secured his spot in the last four with a 6-2 6-3 victory over Japan's Yoshihito Nishioka.

Medvedev, who will officially become world number one for the first time in his career next week after Novak Djokovic's loss to Jiri Vesely in Dubai, brushed aside the Japanese in one hour and 10 minutes.

The Russian sent down 12 aces and won 69 per cent on his first serve, while he converted six of eight break points across the match.

Third seed Stefanos Tsitsipas will meet Briton Cameron Norrie in the other semi-final after both triumphed on Thursday.

Tsitsipas won his quarter-final against Marcus Giron 6-3 6-4 in one hour and 17 minutes, while sixth seed Norrie made light work of Peter Gojowczyk 6-1 6-0.

At the Chile Open in Santiago, local top seed Cristian Garin was stunned by countryman Alejandro Tabilo 6-3 6-3.

Sixth seed Miomir Kecmanovic won 6-2 6-0 over Matheus Pucinelli de Almeida, while Yannick Hanfmann eased past Thiago Seyboth Wild 6-1 6-3.

Novak Djokovic has not lost any motivation for tennis, but believes he needs time to find some rhythm after a long break, as he conceded the world number one spot.

Djokovic's 86-week reign at the top of the ATP rankings will end on Monday, after the Serbian lost to qualifier Jiri Vesely 6-4 7-6 (7-4) in the Dubai Tennis Championships.

That means that Daniil Medvedev will leapfrog Djokovic regardless of whether or not he wins in Acapulco.

Using his official Twitter account, Djokovic congratulated both Vesely – who won his only previous meeting with the 20-time grand slam champion back in 2016 – and Medvedev.

"Well played @jiri_vesely, that was a great game. Wish you the best of luck for the rest of the tournament," Djokovic wrote, accompanying his post with a thumbs up emoji.

"Congratulations also to a very deserving @DaniilMedwed, who will now become world number one."

His appearance in Dubai was Djokovic's first competitive action of 2022, after he was unable to feature at the Australian Open due to his refusal to be vaccinated against COVID-19.

While suggesting he is still working his way back to full sharpness after not playing since December, Djokovic insisted he is fully motivated to carry on playing.

"My goal is to keep on playing tennis," Djokovic said in his post-match news conference.

"That's the ultimate goal. For as long as I really feel like it and as long as I can play. As long as my body allows me, as long as the circumstances in my life as well, the people that surround me [and] support me.

"I'm still motivated and I'm still p***** off when I lose a match. I care about it. I care about winning every match, as anybody else on the Tour, regardless of the age. I'm actually glad that I'm feeling a lot of emotions every single day because it means that I really want to be part of this sport, part of the Tour.

"Unfortunately, [it] wasn't my day. I congratulate Jiri. He played better. 

"The more matches I play, the more comfortable I get on the court. I need the match play. I didn't have many matches at all last few months.

"I don't look at the age really as a restricting factor for my career. I still feel great in terms of my body and the way it's holding on, the way it's recovering. It's been serving me well, so to say. That's something that obviously encourages me to keep going."

Daniil Medvedev will become the new world number one after Novak Djokovic was beaten by Jiri Vesely at the Dubai Tennis Championships.

Medvedev entered this week knowing victory at the Mexican Open would see him move to the top of the ATP rankings for the first time.

But the Russian was still waiting to play his quarter-final on Thursday when his ascension was confirmed courtesy of Djokovic's last-eight defeat in Dubai.

Djokovic, a seven-time year-end number one, had led the rankings for 86 consecutive weeks, boosting his record total to 361 weeks.

In his first tournament since missing the Australian Open, however, the five-time Dubai champion struggled to match 123rd-ranked Vesely and went down 6-4 7-6 (7-4).

Djokovic might have known what to expect, having lost his only prior meeting with Vesely in Monte Carlo in 2016.

The Serbian looked like getting to grips with his opponent at the start of the second set, applying pressure, but was then broken again and had to respond strongly to reach a tie-break.

Again, Vesely led, and Djokovic's match was summed up by a double-fault immediately after winning back the mini-break, allowing the Czech to prevail.

The victor hailed the end of Djokovic's reign, saying in his on-court interview: "It's great for tennis to have somebody new as world number one again.

"We all know Novak missed the Australian Open, but he's been such a champion, as world number one for 361 weeks.

"Tennis needs new number ones, new generations coming up, so I think it's just great."

As Vesely advances, second seed Andrey Rublev will fancy his chances of a second straight ATP Tour title after his win at the Open 13 Provence.

Rublev stretched his winning streak to seven matches in coming from behind to beat Mackenzie McDonald and make the semi-finals, where he will play Hubert Hurkacz, who defeated Jannik Sinner.

Rafael Nadal hopes Alexander Zverev's withdrawal from the Mexico Open will "serve as a lesson" for him and other players when it comes to controlling their emotions on the court.

The world number three was pulled out of this month's tournament in Acapulco following an outburst where he hit the umpire's chair with his racquet in a tirade following a doubles defeat.

The ATP subsequently barred him from competition for a second-round singles clash, with several leading players, including Novak Djokovic, condemning the German's actions.

Speaking ahead of his own quarter-final this week, Nadal - who won a record-breaking 21st Grand Slam in at the Australian Open last month - stated he hoped the 24-year-old and other young players would learn that such behaviour is not acceptable.

"It's unfortunate, without a doubt," the Spaniard said. "I feel sorry for him as I have a good relationship with Alexander.

"In the end, he deserves the sanction because you can't act in this way.

"I think Sascha is aware of that and I hope this will serve as a lesson for him and for other young players who sometimes lose control on the court.

"I am not going to enter into what is or is not fair in terms of sanction," Nadal said. "But in the end you have to stop that type of attitude from becoming fashionable."

Zverev had been due to face Peter Gojowczyk in a singles encounter before he exploded at the end of his match with partner Marcelo Melo against Lloyd Glasspool and Harri Heliovaara.

Following an over-ruled decision from the umpire that handed the latter pair match point in a super tie-break, the duo decided the game with an ace the very next serve.

That led to Zverev smashing his racquet against the umpire's chair on multiple occasions in quick succession, punctured by a foul-mouthed tirade.

The Tokyo 2020 champion subsequently apologised for his behaviour. The Mexico Open continues until February 26.

Rafael Nadal sealed his 12th consecutive win of the new season after a straight sets victory over Stefan Kozlov at the Mexican Open.

Nadal's 12-0 record to begin the year is the best of his illustrious career, and he never looked in any trouble as he eased to a 6-0 6-3 win against the American to advance to the quarter-finals in Acapulco.

The Australian Open champion's next opponent will be Tommy Paul after he beat Dusan Lajovic 7-6 (8-6) 2-6 7-5.

"A little bit of a strange match," Nadal said following his win. "Kozlov has a different style than most other players, so you need to be very careful. Sometimes you are able to win points in a row, but then if you start to play at his rhythm, it's very difficult because he has great control from the baseline and he's very smart."

Number one seed Daniil Medvedev is also safely through after comfortably defeating Pablo Andujar 6-1 6-2, and he will now go up against Yoshihito Nishioka after his victory against Feliciano Lopez.

Stefanos Tsitsipas managed to finish his match against J.J. Wolf in less than 48 minutes as he romped to a 6-0 6-1 win, while his quarter-final opponent Marcos Giron had a much tougher time of it getting past eighth seed Pablo Carreno Busta 6-7 (7-9) 6-4 7-6 (7-4).

Cameron Norrie also came from a set down to beat John Isner 6-7 (2-7) 6-3 6-4, and the sixth seed will now face Peter Gojowczyk after the German received a walkover following his compatriot Alexander Zverev being "withdrawn" from the singles competition after attacking the umpire's chair at the end of his defeat in the doubles.

Meanwhile, in the Chile Open, second seed Albert Ramos-Vinolas beat fellow Spaniard Carlos Taberner 6-2 7-6 (7-4) and will face eighth seed Facundo Bagnis in the quarter-finals after the Argentinian secured a win against Hugo Dellien 6-2 6-2.

Thiago Monteiro fought hard to get past third seed Federico Delbonis with a 3-6 6-4 6-1 victory, and will go up against seventh seed Sebastian Baez in the last eight, who defeated Juan Ignacio Londero 6-3 6-3.

Novak Djokovic condemned the actions of Alexander Zverev, but expressed his support for the world number three after he was "withdrawn" from the Mexico Open for hitting the umpire's chair with his racquet.

Zverev was enraged during a doubles clash with partner Marcelo Melo against Lloyd Glasspool and Harri Heliovaara, after the umpire over-ruled a decision from the line judge.

That subsequently handed Glasspool and Heliovaara match point in the super tie-break, which was decided by an ace on the next serve.

Zverev quickly walked off and smashed his racquet against the umpire's chair three times, before shouting at the umpire that he had "destroyed the whole f****** match" and striking the chair again.

The German was then withdrawn by the ATP due to "unsportsmanlike conduct" ahead of a second-round singles meeting with Peter Gojowczyk.

The Olympic champion has apologised for his actions, explaining his regret at letting his fans, the tournament, and the sport that he loves down, and Djokovic believes Zverev will learn from his mistake.

"I saw the video, I saw Sascha's [Zverev] statement," Djokovic told reporters at a news conference after cruising into the quarter-finals of the Dubai Tennis Championships.

"I think he said it all in that statement. He realises that it was a mistake. I understand the frustration. Sometimes on the court, you feel in the heat of the battle lots of different emotions, different things happening in your head.

"I've made mistakes in the past where I've had tantrums on the court, so I understand what the player is going through. Of course, I do not justify his actions, but that statement has handled it in the right way. 

"He said he made a mistake and his actions were not appropriate. I think that the disqualification decision was not too harsh, I think it was correct under the circumstances. 

"Of course, it can be harsh for a player to get disqualified from a tournament. I know a year-and-a-half ago, I had something - I can't say similar - but I was disqualified from a grand slam after unintentionally hitting the line umpire.

"I realised that it was a mistake and I had to take it. Hopefully, he can reflect on that and not let something like that happen again in his life. I'm sure that he's going to approach it maturely."

Djokovic enjoyed a much calmer outing in Dubai, where he overcame Karen Khachanov in just 98 minutes 6-3 7-6 (7-2) to tee up a quarter-final tie against qualifier Jiri Vesely.

He was then keen to stress that Zverev is not the first player to produce a raging response when on the court, and insisted that the 24-year-old will recover from the outburst.

"I'm sure that the ATP management and officials will look at the video, will probably interview the chair umpire, will take some time to decide what they want to do," he added.

"I'm never going to encourage the ATP disqualifying or fining a player because I'm not in a position to do that, why would I do that? 

"Everyone is a human being, everyone is flawed and can make mistakes, but I wouldn't say that he was the only one that ever has done something like that. 

"There were many examples of players hitting their racquet in the umpire's chair. It happens. Bottles, bags were thrown, a lot of things, a lot of bad words. It's not the only case."

Novak Djokovic is delighted to be back in competitive action after he booked his spot in the quarter-finals of the Dubai Tennis Championships.

Djokovic, whose decision not to be vaccinated against COVID-19 caused him to be deported from Australia on the eve of the year's first grand slam, eased to a 6-3 6-3 win over Lorenzo Musetti in his first match and made similarly light work of Karen Khachanov on Wednesday.

The world number one has won in Dubai on five occasions, last doing so in 2020, having elected against defending his title last year.

However, the Serbian is looking good to regain the crown in what is his first tournament on the ATP Tour in 2022, after he was unable to feature in Melbourne. 

Djokovic needed 98 minutes to see off Khachanov 6-3 7-6 (7-2) and tee up a quarter-final tie against qualifier Jiri Vesely.

"I missed it [playing competitively]. This is my life," Djokovic said, with his previous competitive appearances coming in the Davis Cup Finals in November and December.

"This is what I have known for the past 20 years. Tennis is my love. I enjoy bringing positive energy and memories for people who watch."

It was not all plain sailing for Djokovic, who offered up four break points, but the 34-year-old clawed back three of them.

"I was feeling excited and motivated," added Djokovic, who has progressed to the quarters in Dubai every time he has featured at the tournament.

"But also at the same time I was feeling stressed. Particularly at the moments when I was facing break points. I thought the atmosphere in the stadium was terrific."

Djokovic, who will lose his place at the top of the ATP rankings if Daniil Medvedev triumphs in Acapulco, should have little trouble in sealing a semi-final spot, though Vesely does come into that tie on the back of a surprise 6-2 6-4 win over world number 15 Roberto Bautista Agut, who had triumphed in Doha last week.

Murray falls short of landmark win

Second seed Andrey Rublev came from a set down to defeat Kwon Soon-woo 4-6 6-0 6-3, and will go up against American Mackenzie McDonald for a place in the last four.

There was no such joy for former world number one Andy Murray, however, who fell to Jannik Sinner 7-5 6-2.

"It is a special feeling [to share the court with Murray]," said Sinner, who will next face Hubert Hurkacz, a 6-3 6-2 winner over Alex Molcan.

"He is a legend. Winning three grand slams, many, many tournaments and he has had some unfortunate moments with surgeries. His fighting spirit is incredible.

Murray was chasing a 700th tour-level win of his career but failed to muster a single break opportunity against the Italian, who made it to the quarter-finals in Melbourne last month.

Alexander Zverev has apologised for his outburst at the Mexico Open that saw him "withdrawn" from the singles competition for attacking an umpire's chair. 

Zverev and Brazil's Marcelo Melo were in a super tie-break against Lloyd Glasspool and Harri Heliovaara when they were angered by a call made by the umpire, who overruled a decision from the line judge.

Glasspool and Heliovaara subsequently profited by delivering an ace on match point, which was followed by Zverev quickly walking off and smashing his racquet against the umpire's chair three times.

The world number three then shouted at the umpire that he had "destroyed the whole f****** match" before striking the chair again.

Zverev was due to be in second-round singles action against Peter Gojowczyk, but the ATP Tour confirmed the Olympic champion had been removed from the draw due to "unsportsmanlike conduct".

Former world number one Andy Murray condemned the 24-year-old's "reckless" outburst after his loss to Jannik Sinner, and Zverev has now apologised unreservedly for his raging response.

"It is difficult to put into words how much I regret my behaviour during and after the doubles match yesterday," Zverev wrote on Instagram on Wednesday. 

"I have privately apologised to the chair umpire because my outburst towards him was wrong and unacceptable, and I am only disappointed in myself. 

"It just should not have happened and there is no excuse. I would also like to apologise to my fans, the tournament, and the sport that I love.

"As you know, I leave everything on the court. Yesterday, I left too much. I am going to take the coming days to reflect – on my actions and how I can ensure that it will not happen again. I am sorry for letting you down."

Alexander Zverev has been "withdrawn" from the singles competition at the Mexican Open in Acapulco after attacking the umpire's chair at the end of his defeat in the doubles.

Zverev and Brazil's Marcelo Melo were in a super tie-break against Lloyd Glasspool and Harri Heliovaara when they were angered by a call made by the umpire.

A return on Melo's serve seemed to be called out by a line judge, but the umpire overruled the decision to put Glasspool and Heliovaara 9-6 up and give them match point, a subsequent ace ending the match in their favour.

As the pairs shook hands at the net afterwards, Zverev quickly walked off and smashed his racquet against the umpire's chair three times.

He then shouted at the umpire that he had "destroyed the whole f****** match" before striking the chair once more.

Zverev was due to face Peter Gojowczyk in the second round of the singles, but the ATP Tour confirmed the Olympic champion has been removed from the draw.

A brief statement read: "Due to unsportsmanlike conduct at the conclusion of his doubles match on Tuesday night, Alexander Zverev has been withdrawn from the tournament in Acapulco."

Rafael Nadal equalled the best start to a season in his career after winning his first match at the Mexican Open on Tuesday.

In his first match since a record 21st grand slam title in Australia, Nadal was a comfortable 6-3 6-2 winner over Denis Kudla, dropping only four points on serve.

Nadal is now 11-0 for the season, equalling the start he made in 2014, when his winning run was ended by Stan Wawrinka in the Australian Open final.

"I think I started playing well, a good victory in straight sets. That's always very positive for the confidence," said Nadal. "I think I played a very solid match for the first day.

"Of course, there are a couple of things that I can do better, but in general terms, I played well, so I can't complain at all."

Daniil Medvedev, who had also not played since the final in Melbourne, came through a tougher contest against Benoit Paire 6-3 6-4 in his opening match in Acapulco.

Medvedev held a two-set lead and looked in control before Nadal came roaring back to claim the Australian Open title, but the Russian could claim a landmark achievement in his first tournament since that heartbreak.

Medvedev, who faces Pablo Andujar next, will become world number one if he wins in Mexico, regardless of Novak Djokovic's performances in Dubai.

"It's always not easy to come back after some rest and some time off competition," he said. "I felt like my sensations were not at the top today, but I managed to fight until the end against a very tough opponent, and I'm happy that I managed to win."

Stefanos Tsitsipas racked up the 200th win of his career, holding off Laslo Djere to win two tie-breaks. He will now face J.J. Wolf, who surprised Lorenzo Sonego by fighting back from a set down to win 3-6 7-6 (9-7) 6-2.

Cameron Norrie was a straight-sets winner over Daniel Altmaier, while Yoshihito Nishioka battled through against veteran Feliciano Lopez.

Tommy Paul progressed after Matteo Berrettini retired when the American was poised to tie the match at one set all. John Millman also had to call an early halt to his match with Marcos Giron after a freak accident on court in which the Australian accidentally hit a ball into his eye.

At the Chile Open, home favourite Alejandro Tabilo beat Renzo Olivo in straight sets, while fifth seed Federico Coria was earlier knocked out by Yannick Hanfmann.

Miomir Kecmanovic defeated Marco Cecchinato, while there were also wins for seeds Sebastian Baez and Facundo Bagnis.