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.

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Djokovic condemned the actions of Alexander Zverev, but expressed his support for the world number three after he was "withdrawn" from the Mexico Open for hitting the umpire's chair with his racquet.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

Jannik Sinner saved three match points to avoid a shock defeat to Alejandro Davidovich Fokina in the first round of the Dubai Tennis Championships.

After losing the first set, the world number 10 staved off defeat in a nerve-wracking second-set tie-break.

The fourth seed clung on as Davidovich Fokina saw a trio of opportunities to clinch a shock win go begging, the Spaniard made to pay as his Italian counterpart fought back to prevail 4-6 7-6 (8-6) 6-3.

Sinner, who will next face former world number one Andy Murray, said: "It was a very tough match. I know him, but we've never played against each other.

"It was the first time for both of us and it was a tricky one, saving three match points. On the first one I got lucky because it was out, but not so far [out]."

Second favourite Andrey Rublev won both the singles and doubles titles in Marseille last week and continued his fine form with a 6-4 7-5 win over Daniel Evans that saw the Russian send down 28 winners.

Sixth seed Denis Shapovalov had to recover from a set down to see off Marton Fucsovics, though fifth seed Hubert Hurkacz enjoyed a more routine straight-sets triumph over Alexander Bublik.

Eighth seed Roberto Bautista Agut made relatively light work of Arthur Rinderknech but defending champion and seventh seed Aslan Karatsev was stunned 7-5 6-3 by Mackenzie McDonald.

Karen Khachanov needed a little shy of three hours to beat Alex de Minaur, his dubious reward a second-round clash with Novak Djokovic as the world number one continues his return to the Tour following his controversial Australian Open absence.

Alexander Zverev saved two match points and battled back to salvage a dramatic victory over Jenson Brooksby at the Mexican Open in what was the latest finish in tennis history.

Second seed Zverev – the defending champion in Acapulco - wrapped up a dramatic win at 04:55 local time after his own lengthy contest had followed two other epic three-setters earlier on the schedule.

Zverev at one stage looked like he was on the way out but ultimately triumphed 3-6 7-6 (12-10) 6-2 to book a second-round tie against Peter Gojowczyk.

The German had beaten Brooksby in a match that also went to a decider when they clashed at Indian Wells in October and he was pushed to the limit again in a battle lasting 200 minutes.

Having dropped the first set, Zverev had to fend off three break points at 3-3 in the second and saved match points at 6-5 and 10-9 down as part of an epic tie-break that went in his favour. 

Zverev was then more comfortable as he broke twice in the decider to seal victory, his American opponent paying the price for converting just one of his seven break-point opportunities in a match that made history for its late finish.

The previous latest ATP finish time was Lleyton Hewitt's 2008 Australian Open clash with Marcos Baghdatis, which ended at 04:34 local time.

Elsewhere, Stefan Kozlov overcame cramps in the second set to outlast Bulgarian Grigor Dimitrov 7-6 (10-8) 5-7 6-3, with that match lasting three hours and 21 minutes.

John Isner sent down 29 aces and saved a match point as he trailed 5-2 in the third set, ultimately winning 7-5 6-7 (4-7) 7-6 (7-3) over veteran Fernando Verdasco in another epic topping the three-hour mark that helped to push back the start time for Zverev and Brooksby.

Seventh seed Taylor Fritz got past Frenchman Adrian Mannarino 6-3 6-3, while Dusan Lajovic knocked off Sebastian Korda 6-4 4-6 7-5 and eighth seed Pablo Carreno Busta beat Oscar Otte in straight sets.

At the Chile Open in Santiago, eighth seed Facundo Bagnis won 6-3 6-0 over Bernabe Zapata Miralles in the round of 32.

Brazilian Thiago Monteiro got past local Nicolas Jarry 7-6 (11-9) 6-4, while qualifier Juan Ignacio Londero and wildcard Thiago Seyboth Wild also progressed.

Alexander Zverev saved a match point and battled back to salvage a dramatic victory over Jenson Brooksby at the Mexican Open in what was the latest finish in tennis history.

Second seed Zverev – the defending champion in Acapulco - wrapped up a dramatic win at 04:55 local time after his own lengthy contest had followed two other epic three-setters earlier on the schedule.

Zverev at one stage looked like he was on the way out but ultimately triumphed 3-6 7-6 (12-10) 6-2 to book a second-round tie against Peter Gojowczyk.

The German had beaten Brooksby in a match that also went to a decider when they clashed at Indian Wells in October and he was pushed to the limit again in a battle lasting 200 minutes.

Having dropped the first set, Zverev had to fend off three break points at 3-3 in the second and saved a match point at 6-5 as part of an epic tie-break that went in his favour. 

Zverev was then more comfortable as he broke twice in the decider to seal victory, his American opponent paying the price for converting just one of his seven break-point opportunities in a match that made history for its late finish.

Elsewhere, Stefan Kozlov overcame cramps in the second set to outlast Bulgarian Grigor Dimitrov 7-6 (10-8) 5-7 6-3, with that match lasting three hours and 21 minutes.

John Isner sent down 29 aces and saved a match point as he trailed 5-2 in the third set, ultimately winning 7-5 6-7 (4-7) 7-6 (7-3) over veteran Fernando Verdasco in another epic topping the three-hour mark that helped to push back the start time for Zverev and Brooksby.

Seventh seed Taylor Fritz got past Frenchman Adrian Mannarino 6-3 6-3, while Dusan Lajovic knocked off Sebastian Korda 6-4 4-6 7-5 and eighth seed Pablo Carreno Busta beat Oscar Otte in straight sets.

At the Chile Open in Santiago, eighth seed Facundo Bagnis won 6-3 6-0 over Bernabe Zapata Miralles in the round of 32.

Brazilian Thiago Monteiro got past local Nicolas Jarry 7-6 (11-9) 6-4, while qualifier Juan Ignacio Londero and wildcard Thiago Seyboth Wild also progressed.

Novak Djokovic welcomed the "positive" reception he has received from his fellow players, after making his first appearance since missing the Australian Open.

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 just 74 minutes at the Dubai Tennis Championships.

Djokovic spoke publicly about his vaccination status for the first time in a BBC interview last week, while rival Andy Murray, who has spoken about his support for vaccination on numerous occasions, said that he "didn't like seeing" Djokovic's ordeal in Australia after his own win in Dubai.

Serbia's 20-time Grand Slam winner says that most of his fellow professionals have been supportive upon his return to action.

"So far here most of the players that I’ve seen – I haven’t seen too many players – but most of the players that I've seen have been positive and welcoming", he said after his round-of-32 win.

"It's nice to see, obviously. I can't say that was the case in Australia. It was a little bit strange. But here, it's gone well so far."

The 34-year-old impressed against Musetti, serving five aces, winning 71 per cent of his second serves (17 out of 24) and saving each of the seven break points he faced during his first outing of the year, and Djokovic was also pleased with the reception he received from the fans in Dubai, as well as with his performance. 

"I couldn't ask for a better reception," he added.

"It's been a while since I played, and I couldn't think of a better place to kick-start the season. Thank you for the reception and for welcoming me on court the way you did.

Carlos Alcaraz declared he is "a boy who dreams big" after the 18-year-old landed the Rio Open title and outlined his plans to dominate men's tennis.

A teenager going places, Spaniard Alcaraz was set to shoot up to a career-high ranking inside the ATP top 20 on Monday on the strength of his successful week in Brazil.

He was too strong for Argentina's Diego Schwartzman in what turned out to be a one-sided final, with Alcaraz a 6-4 6-2 winner over an experienced and classy opponent.

It made him the youngest winner of an ATP 500 tournament, since the 2009 creation of that category. Such events rank below the importance of the Masters 1000 tournaments but remain prestigious, and it is one step at a time for now for Alcaraz towards lofty targets.

Alcaraz said: "My ambitions are to be number one in the world, a winner of grand slams, a winner of Olympic medals... I am a boy who dreams big."

This clay-court success whets the appetite for what Alcaraz might achieve on the surface over the coming months. He won the Umag tournament in Croatia on clay last July but will likely be targeting the likes of Rome, Barcelona, Madrid, Monte Carlo and even Roland Garros for similar success this year.

It was in Rio two years ago that Alcaraz first won an ATP main-draw match.

"Two years later, winning the tournament means a lot to me," Alcaraz told a news conference. "When I came here for the first time, I came to continue enjoying myself, to learn from the best. This time I had high expectations and I came thinking that I could win, that I am a candidate.

"I am super happy to have won my first ATP 500. It has been a week full of emotions and to be able to win this final has been a great joy for me."

Alcaraz was gutted to miss last year's Davis Cup finals after testing positive for COVID-19, but the powerful teenager is on a mission to maximise his talent in 2022.

He went toe to toe with Matteo Berrettini in the third round of the Australian Open, coming from two sets down to force a decider against last year's Wimbledon runner-up, only to lose out on a tie-break.

This time, Berrettini was among his victims on the road to the title in Rio.

Alcaraz said after Sunday's win, according to Spanish newspaper AS: "The expectations that people have of me are high, and I appreciate that they see that I can be the best in the world, but both my team and I know how difficult it is.

"I think I'm on the right path and if I don't deviate from it and keep doing things well, it won't be guaranteed, but I will have opportunities."

Teenage sensation Carlos Alcaraz made history as he defeated Diego Schwartzman in straight sets to claim the Rio Open title.

The 18-year-old became the youngest winner of an ATP 500 event since the creation of the category in 2009, clinching a 6-4 6-2 victory in one hour and 26 minutes.

Alcaraz, set to climb into the world's top 20 for the first time, captured his second tour-level title after triumphing at last year's Croatia Open.

The Spaniard won five out of six break points, including a crucial one at 4-4 on his way to taking the opening set.

Third seed Schwartzman – champion in Rio in 2018 – was appearing in his second successive final, having reached the showpiece in Buenos Aires last week.

But the Argentinian was unable to compete with the powerful seventh seed on clay, the surface on which Alcaraz could do major damage in the coming years.

Meanwhile, Cameron Norrie landed his third ATP Tour title after beating Reilly Opelka 7-6 (7-1) 7-6 (7-4) in the Delray Beach Open showpiece.

Top seed Norrie had endured a torrid start to the 2022 season, which began for him with four successive defeats.

Meanwhile, Opelka was seeking a second title in as many weeks following his triumph at the Dallas Open.

The American had won six out of six tie-breaks on his way to victory in Dallas, and a further four this week.

But despite the big-serving second seed hitting 25 aces against Norrie, taking his tournament tally to 81, and 46 winners, a total of 33 unforced errors proved costly.

Although he was denied all five opportunities to break as both sets went to a tie-break, Norrie's service game remained solid throughout and just seven unforced errors underlined his strong performance.

Spanish teenager Carlos Alcaraz secured a spot in the Rio Open final after knocking off top seed Matteo Berrettini followed by countryman Fabio Fognini on Saturday.

Several quarter-finals were squeezed into Saturday's schedule alongside evening semi-finals following Friday's ranout, forcing Alcaraz to play twice along with Diego Schwartzman who also progressed to Sunday's decider.

Alcaraz first defeated top seed and 2021 Wimbledon finalist Berrettini in three sets, triumphing 6-2 2-6 6-2 in two hours and two minutes.

The 18-year-old Spanish seventh seed, who reached last year's US Open quarter-finals, backed that up with a straight-sets win over Fognini, 6-2 7-5.

"It means a lot to me," Alcaraz said post-match. "I surprised myself to be able to win two matches in a row in the same day. It's tough to win one match, two is even tougher."

Third seed Schwartzman got past fellow Argentine Francisco Cerundolo 7-6 (7-4) 6-3 in a two-hour-and-two-minute semi-final, having won through earlier in the day 7-6 (7-3) 4-6 6-4 against Pablo Andujar.

The top two seeds will meet in the Delray Beach Open final in Florida after wins by Cameron Norrie and Reilly Opelka on Saturday.

First seed Norrie got past American fourth seed Tommy Paul 6-3 6-3 in one hour and 16 minutes. Norrie had endured a slow start to the calendar year, but will now play for a third ATP Tour title.

Second seed Opelka had a tougher outing, needing three hours to overcome John Millman 7-6 (10-8) 6-7 (3-7) 7-6 (7-4). In a match which only saw two breaks of serve,

Opelka, who won last week's Dallas Open title, sent down 16 aces and won 82 per cent of his first serve.

Top seed Cameron Norrie is through to the semi-finals of the Delray Beach Open after beating Sebastian Korda in three sets.

Norrie eventually overcame the American fifth-seed after a final set tie-break, winning 6-2 1-6 7-6 (7-4).

The Brit's tenacity was key, saving seven of 10 break points, and he will now face another American, Tommy Paul, in the final four in Florida after he beat qualifier Stefan Kozlov 6-3 6-1.

The other semi-final will be contested between Reilly Opelka and John Millman after they bested Adrian Mannarino and Grigor Dimitrov respectively.

Opelka was taken to a third set by his French opponent before winning 7-6 (7-2) 3-6 6-1, hitting 19 aces on his way to victory.

Millan proved too good for third seed Dimitrov winning 6-4 6-4 in an hour and 34 minutes where the Australian's return was a highlight.

At the Rio Open, rain washed out many of the scheduled matches on Friday, with Diego Schwartzman against Pablo Andujar and Miomir Kecmanovic against Francisco Cerundolo both cancelled.

Matteo Berrettini and Thiago Monteiro were finally able to finish their round of 16 match at 11.35pm local time, with the Italian securing victory 6-4 6-7 (6-8) 6-3.

He will play seventh seed Carlos Alcaraz who overcame Federico Delbonis 6-4 7-6 (7-1) after their match was pushed back, starting not long prior to midnight local time.

Diego Schwartzman felt he played "an almost perfect match" to overcome Pedro Martinez in straight sets and reach the quarter-finals of the Rio Open.

The third seed advanced with a 6-1 6-1 victory, though that does not quite tell the whole story as the second game of the first set lasted a mammoth 24 minutes and 40 seconds.

Martinez saved eight break points in that lengthy game before finally being outdone by Schwartzman, who will now face another Spaniard in Pablo Andujar.

Incredibly, Martinez won 31 points in the first set but just one game.

"It was unbelievable," Schwartzman said. "This was probably the longest game in the history of the tournament 

"I don't remember anything like this before. I played an almost perfect match, I played against an opponent that had as much confidence as me."

Andujar beat Albert Ramos-Vinolas 7-5 5-7 6-3, while fourth seed Pablo Carreno-Busta lost 5-7 6-4 6-3 to Fabio Fognini in the shock of the day.

Federico Coria awaits Fognini after following up his surprise win over defending champion Cristian Garin with a 7-6 (7-2) 4-6 6-4 victory against Fernando Verdasco.

At the Delray Beach Open, top seed Cameron Norrie beat Oscar Otte 6-3 7-5 and will face Sebastian Korda, who saw off Andreas Seppi 7-5 6-3, for a place in the semi-finals.

Tommy Paul and Stefan Kozlov are also through to the final eight in Florida after beating Denis Istomin and Steve Johnson respectively in straight sets.