Top seed Denis Shapovalov's Swiss Open Gstaad campaign came to an abrupt end as Vit Kopriva provided a second-round shock to eliminate the Wimbledon semi-finalist.

The world number 10, who has recently been praised by both Roger Federer and Rafael Nadal, took the first set 6-2 with ease before Kopriva, making his ATP Tour debut this week, emphatically fought back 6-3 6-2 to secure a memorable comeback victory.

Number three seed Casper Ruud battled past Dennis Novak 6-4 7-6 (7-5), while Benoit Paire, who only had two ATP wins in 2021 before the Hamburg European Open last week, was 6-4 to the good before Tallon Griekspoor was forced to retire due to injury.

Ruud, who has already won two ATP events in 2021 and three in his career, will now meet sixth seed Paire in the quarter-final stage.

But eighth seed Feliciano Lopez did not enjoy similar success as the world number 96 Mikael Ymer fought past the Spaniard to win 6-7 (6-8) 7-6 (9-7) 6-4 and set-up a quarter-final clash with Kopriva.

At the Umag Open in Croatia, third seed Filip Krajinovic breezed past Radu Albot to record a 6-4 6-2 win.

Krajinovic's countryman and number two ranked player Dusan Lajovic also went through with a 7-5 6-4 win against Bernabe Zapata Miralles.

Casper Ruud won his third ATP Tour title on Sunday thanks to a straightforward win over Federico Coria in the Nordea Open final.

The Norwegian needed just under 90 minutes to see off Coria, who was competing in his maiden tour-level final, getting the job done to win 6-3 6-3.

Ruud's electric start set the tone for the contest, as he raced into a 4-0 lead thanks to successive breaks – although Coria broke back to make it 4-1, his opponent's wobble was only brief.

Coria ensured the match was a little tighter initially in the second set, but Ruud's class showed as he rattled off three breaks on the trot and eventually converted his fifth match point in front of a joyous support.

"It was an incredible week, maybe the best week of my life," Ruud said after sealing the title without losing a single set.

"It's an incredible feeling playing here in Bastad with the Swedish, Norwegian and Danish support. There is nothing like that home crowd feeling.

"To win here means a lot. You get a little extra nervous as the No. 1 seed. Me and my father [former player Christian Ruud] have been joking about when I am going to beat him at this and this, and now I think I have beaten him in everything!

"The Ruud family can finally bring the trophy home to Norway. It is a special feeling having him here with me."

Filip Krajinovic will take on Pablo Carreno Busta in the Hamburg European Open final on Sunday.

A memorable week for Krajinovic continued as he saw off fellow Serbian Laslo Djere 6-4 6-2 in his semi-final.

Sixth seed Krajinovic defeated Stefanos Tsitsipas in the quarter-finals and ensured he followed up on that surprise victory with a dominant display against Djere on Saturday.

The victor committed only seven unforced errors in the match, while conceding just two break points in the contest.

Second seed Carreno Busta has not dropped a set all week and kept that run going with a 7-6 (7-2) 6-3 win over Federico Delbonis.

Carreno Busta needed just under two hours to see off a battling Delbonis, with neither player offering up a single break point in a first set that went the distance.

The Spaniard won five straight points to take the tie-break and continued that momentum into the second set when he broke Delbonis twice.

Neither Carreno Busta nor Krajinovic has ever won a tournament at ATP 500 level or above.

Carreno Busta has five career titles, but all of those are at ATP 250 level, losing to Dominic Thiem in his only showpiece appearance at this level at the Rio Open back in 2017.

Krajinovic, meanwhile, has lost all three of the career finals he has reached.

"I enjoy playing here, I feel comfortable here," Carreno Busta said. "It is my most important match this year on Sunday - I need to be really focused until the end.

"[Delbonis] is a really tough player and my level was very good. I probably played better in the second set, but I continued fighting all the time."

At the Nordea Open in Bastad, Sweden, top seed Casper Ruud was comfortable as he defeated Roberto Carballes Baena 6-1 6-4 to earn a place in the final.

Ruud needed just 79 minutes to do the job, breaking Carballes Baena on five occasions. 

He has only played two matches – both comfortable wins – to reach the final after a walkover against Henri Laaksonen in the quarters.

Rising star Ruud will bid for his second ATP title of the year and the third of his career against Federico Coria on Sunday.

Coria also had a comfortable last-four tie, seeing off Germany's Yannick Hanfmann 6-2 6 -1, with the win meaning the 29-year-old reached his maiden career tour final.

"I am very happy - it is my first final," said world number 77 Coria, who beat second seed Cristian Garin in the last eight.

"I played the best tennis of my life in this match. It is amazing here in Bastad, it is beautiful."

Casper Ruud fed off the growing expectation that surrounds him as he took a convincing first step in the Nordea Open.

The 22-year-old Norwegian has rocketed from outside the top 50 to 16th currently in the world rankings in just 18 months, and he is the top seed this week in Sweden.

Such a status is all rather novel for Ruud, but he breezed to a 6-0 6-2 win over 18-year-old Danish wildcard Holger Vitus Nodskov Rune on Thursday.

That carried him through to a quarter-final meeting with Swiss player Henri Laaksonen.

Ruud is back on clay this week, having enjoyed great success on the surface already this season, reaching semi-finals of the Masters 1000 events in Madrid and Monte Carlo, while also winning a title in Geneva.

A first-round exit on the Wimbledon grass followed those positive results, so another event on clay comes as a boost.

"It is a surface I have had the most success of my career, it is great to be back here in Bastad," Ruud said after crushing Rune's hopes.

"There is a bit of extra pressure [being the top seed]. In a match like this against a fellow Scandinavian younger player, it is even more."

He added, quoted by the ATP website: "I think I was very professional in my mindset today. I played a match without any errors really from the first to the last point.

"It is a nice feeling being the top seed but also pressure. I felt great crowd support, it is nice to feel that energy."

Qualifier Laaksonen beat Elias Ymer 6-2 7-5, while third seed Fabio Fognini was bounced out of the tournament, losing 6-3 1-6 6-4 to Spain's world number 97 Roberto Carballes Baena, who will tackle Slovakian Gombos in the last-eight stage on Friday.

At the Hamburg European Open, Pablo Carreno Busta justified his standing as second seed with a 7-5 6-3 win over fellow Spaniard Carlos Taberner to reach the quarter-finals.

Stefanos Tsitsipas is the top seed this week at the tournament in Germany and won through to the last eight on Wednesday.

Others to move through the rounds in Hamburg on Thursday included Dusan Lajovic and Federico Delbonis, the latter advancing with a handy 6-3 7-6 (7-4) win over fourth seed Albert Ramos-Vinolas.

Feliciano Lopez reached the milestone of 500 ATP Tour wins with a comeback victory over Karen Khachanov at the Mallorca Championships.

Lopez, who turns 40 in September, prevailed 4-6 6-2 6-4 against the sixth seed.

He is the 10th active player to reach 500 wins, after Roger Federer, Rafael Nadal, Novak Djokovic, Andy Murray, Richard Gasquet, Fernando Verdasco, Marin Cilic, Stan Wawrinka and Tommy Robredo.

"More than the 500 wins, the important thing to me is the chance to keep playing in these kinds of tournaments and to keep being competitive," Lopez told ATPTour.com.

"I didn’t expect to be able to play at the level I am on the ATP Tour at 40 years of age, which I will be in September."

Spanish veteran Lopez would have expected to be taking on Dominic Thiem next, but the world number five retired due to a wrist injury when 5-2 to the good in the opening set against Adrian Mannarino.

"It's nice for me to be in the quarter-finals, but winning this way is not so cool. I really like Dominic, he's such a nice guy and I hope he will be feeling better soon," Mannarino said. "I hope it is not so serious, especially right before Wimbledon."

Elsewhere on the Balearic island, top seed Daniil Medvedev breezed past Corentin Moutet 6-4 6-2, while Casper Ruud defeated Tennys Sandgren in straight sets.

At the Viking International in Eastbourne, there were mixed fortunes for Lopez's countrymen Alejandro Davidovich Fokina and Albert Ramos-Vinolas.

Fokina, seeded sixth, saw off Mikael Ymer 7-5 6-1, but number seven seed Ramos-Vinolas fell 6-4 6-3 to Emil Ruusuvuori.

Alexander Bublik defeated fellow Kazakh Mikhail Kukushkin is straight sets, while Jo-Wilfred Tsonga went down in similar fashion against Egor Gerasimov.

Fifth seed Casper Ruud secured his place in the last 16 of the Mallorca Championships with a straight sets win over Gilles Simon on Monday.

The 22-year-old claimed a 6-4 7-6 (7-4) victory to set up a meeting with Tennys Sandgren in the next round.

Following Ruud onto Centre Court, the American beat Spain's Jaume Munar 7-6 (7-3) 7-5 in just over two hours.

Sixth seed Karen Khachanov is also safely through, although he surrendered a set in beating French qualifier Lucas Pouille 7-6 (9-7) 3-6 6-4.

But Dusan Lajovic, seeded eighth, was not quite as fortunate.

Lajovic, ranked 41st in the world, was beaten 6-4 7-6 (7-2) by Slovakian qualifier Lukas Klein (ranked 256).

Feliciano Lopez came out on top of battle of Spaniards in the round of 32, beating Nicola Kuhn 6-1 7-6 (7-4).

Their compatriot Roberto Carballes Baena is in with a chance of joining them on Tuesday after seeing his clash with Sam Querrey paused due to light with both players having taken a set.

Elsewhere, Corentin Moutet beat Lloyd Harris to set up a meeting with top seed Daniil Medvedev, while Jiri Vesely and Stefano Travaglia also progressed.

Monday's other scheduled ATP event in Eastbourne saw play cancelled due to rain, with the scheduled match between Jo-Wilfried Tsonga and Egor Gerasimov pushed back as a result.

Rising star Casper Ruud continued his impressive 2021 with a straight-sets win over Denis Shapovalov in the Geneva Open final to win his second career title.

The world number 21 prevailed 7-6 (8-6) 6-4 in the first top-level meeting between the two players to add to the Argentina Open crown won – also on clay – in February 2020.

Ruud did not face a single break point in the match, which lasted an hour and 40 minutes, and needed only one break conversion himself to see off second seed Shapovalov.

"It's tough to find all the words," said Ruud, who has a 15-4 record on clay this year. 

"It was such an amazing week here in Geneva. I was always looking forward to coming to this tournament.

"I watched it on TV for many years when I was younger and it always seemed like a nice place, so I guess I know why I wanted to come here.

"It's been going well and this week has been unbelievable for me."

Looking to lay down a marker ahead of the upcoming French Open, where he reached the third round last year, third seed Ruud took little time to get going against Shapovalov.

However, the first set went the way of the serve to set up a tie-break, which the Norwegian eventually took with his fifth set point after Shapovalov won four points in a row.

Shapovalov was competing in his third tour-level final after winning the Stockholm Open and losing in the Paris Masters final in 2019, but he struggled to break his opponent.

Ruud earned a break in the fifth game of the second set and saw the job through to keep his momentum going ahead of the second grand slam of the year.

Asked about his aims for Roland Garros, Ruud said: "Well, it's the toughest clay court tournament of the year.

"This season I am playing well on the clay and I'm looking forward to Paris. I hope I can make the second week, that's all I can say.

"If I'm in the second week I will be very happy of course."

Stefanos Tsitsipas insists it must be purely business when he tackles Italian teenager and fellow tennis artisan Lorenzo Musetti in the Lyon Open semi-finals.

Ahead of a tilt at the French Open, for which he is among the favourites, world number five Tsitsipas has been tuning up his game at this week's ATP 250 tournament.

The Greek star was sharp in posting a 6-3 6-4 win over Japan's Yoshihito Nishioka, and 19-year-old Italian Musetti awaits him on Saturday.

Tsitsipas dropped just four games when he crushed Musetti in an Acapulco semi-final in March, but he senses more of a threat this time from the exciting youngster.

"We played in different conditions. Acapulco was a hardcourt match and with altitude," said Tsitsipas, speaking on Amazon Prime. "The conditions here are different. He's someone who enjoys playing on clay.

"We share a similar game style I think with a one-handed backhand, which is beautiful to see, but tomorrow it's going to be serious business I knew he can play good on this surface. I know he can elevate his game, so it's important for me to be in the semi-finals."

Musetti overcame Slovenian Aljaz Bedene 6-3 7-6 (7-2) in their quarter-final, scrambling through a chaotic second set in which he trailed 5-2 at one stage but then reeled off four straight games, only to fail to serve out.

Thankfully for the youngster, he pulled through the tie-break.

"It was a crazy end," said Musetti. "I was 6-5 up, and at 30-30 played a really bad volley and hit an underarm serve. Sometimes I go out of my mind. I am really proud of myself as I was 2-5 down in the second set and I stayed focused. I tried to play each point at my best."

Russian Karen Khachanov marked his 25th birthday with a 6-1 7-6 (7-3) win over Frenchman Richard Gasquet, veteran doyen of the single-handed backhand.

Khachanov faced a wait to learn who he must face in the semi-finals, however, with Cameron Norrie and Arthur Rinderknech level at one set all overnight, after rain forced an early end to play.

At the Geneva Open, Norway's Casper Ruud will tackle Canadian Denis Shapovalov in Saturday's final.

Ruud saw off Spaniard Pablo Andujar 6-3 6-2, while Shapovalov earned a 6-4 7-5 win against Uruguayan qualifier Pablo Cuevas.

Lyon Open top seed Dominic Thiem was stunned in straight sets by Cameron Norrie in the last 16 on Thursday for the "biggest win" of the Briton's career.

Thiem was handed a bye to this stage and fell at the first hurdle on a day of upsets, the world number four sending down four double faults and losing serve three times as he lost 6-3 6-2.

Norrie now has 10 victories on clay in 2021, compared to seven before this year, and will face qualifier Arthur Rinderknech – a surprise 6-7(7) 6-2 7-5 winner against Jannik Sinner – in the quarters.

"I'm so pleased to win. It's the biggest win of my career and my highest-ranked win," Norrie, who had never previously beaten a top-five opponent, said in his on-court interview. 

"It's such a beautiful day in Lyon. I couldn't be happier to get the win today and to get another match on the clay before Roland Garros."

Third seed Diego Schwartzman also exited the competition on Thursday with a 6-3 7-5 defeat to Richard Gasquet, who eased over the line despite letting two match points slip.

Stefanos Tsitsipas is now the strong favourite to triumph in France after starting his campaign with a convincing 6-1 6-4 victory over Tommy Paul.

Yoshihito Nishioka upset Gael Monfils 4-6 6-3 7-6(2) in an impressive comeback victory and now awaits Tsitsipas in the last eight.

At the Geneva Open, rising star Casper Ruud kept his momentum going with a 2-6 6-1 6-4 win over Dominik Koepfer to make it 12-4 on clay this season.

Ruud recovered from a sloppy first set by holding his serve in the following two sets to reach his fourth successive clay court semi-final on the ATP Tour.

Next up for the third seed is a meeting with Pablo Andujar, who beat youngster Dominic Stephan Stricker 4-6 6-4 6-4.

Elsewhere, Laslo Djere overcame Fabio Fognini 6-3 6-7(2) 6-1 to reach the quarter-finals and will face Denis Shapovalov later on Thursday after the Canadian recovered from a set down to beat Marco Cecchinato 6-7 7-5 6-1.

The winner of that match will meet Pablo Cuevas, the Uruguayan having ended Grigor Dimitrov's run with a battling 7-6 6-3 win.

Matteo Berrettini will take on Alexander Zverev in the Madrid Open final on Sunday after overcoming Casper Ruud 6-4 6-4 in the last four. 

Eighth seed Berrettini has enjoyed a superb debut tournament in the Spanish capital, the 25-year-old dropping just one set on his way to becoming the first Italian to make the Madrid Open final. 

Berrettini, who won the Serbia Open last month, is just the third Italian ATP Masters 1000 finalist since the series was established in 1990, after Fabio Fognini and Jannik Sinner. 

"It's a great, unbelievable feeling, especially coming from Monte Carlo where I wasn't feeling that good," Berrettini said in quotes reported by the ATP website. 

"I won in Belgrade and now I'm in the final, so I'm really looking forward to playing against Sascha [Zverev]. I hope I enjoy it tomorrow the way I enjoyed tonight.

"I saw him [Zverev], he's playing really good. He's solid. He moves well. For his height, he's really good. He serves well. I mean, he's in the final. He beat Rafa [Nadal] and Dominic [Thiem], probably the best players on clay.

"It's going to be a challenging match, but I'm in the finals. I guess the best two guys are going to play each other."

Berrettini returned supremely throughout Saturday's match, nullifying Ruud's usually potent serve, and believes his aggressive approach was key to victory.

"My serve is my weapon, but today I think I returned a lot and I put pressure on him," Berrettini said. "I was just playing more aggressive. He's kind of like me, he likes to run around the forehand and play with spin. But I guess today I was playing better than him.

"The other time he beat me, so it's always a great fight against him. He reached three semi-finals in a row so he was feeling confident. I guess that's why I'm maybe even more happy with my win today."

In the earlier semi-final, Zverev followed up his famous win over home favourite and 20-time grand slam champion Rafael Nadal in the previous round by defeating Dominic Thiem.

Austrian Thiem had won the last four meetings between the two, including in last year's Australian Open semi-final and the US Open decider, where he came from two sets down to win in an incredible fifth-set tie-break.

However, Zverev was not to be denied this time, a 6-3 6-4 result keeping him on course for a repeat of his 2018 triumph at the event in the Spanish capital.

Alexander Zverev can see his rivalry with Dominic Thiem continuing for many years after he came out on top in their latest duel at the Madrid Open.

The German followed up his famous win over home favourite Rafael Nadal by defeating Austria's Thiem 6-3 6-4 in the semi-final on Saturday.

Zverev, who won this event in 2018, will meet either Casper Ruud or Matteo Berrettini in the final.

Thiem had won the last four meetings between the two, including in last year's Australian Open semi-final and the US Open final, where he came from two sets down to win in an incredible fifth-set tie-break.

Zverev said after his victory over Nadal that he would be thinking about that crushing loss in New York prior to his meeting with Thiem.

And he was able to gain a small measure of revenge for those recent grand slam defeats in the Spanish capital.

"We have had some fantastic matches," said Zverev. "We have played the biggest matches in the world. We have played Masters 1000 finals, we have played grand slam finals and [the rivalry] is still developing.

"It is still going to go on for a few more years. Hopefully we will play a few more amazing matches. It feels very [sweet to win], it is a rivalry where he kicks my a** most of the time!

"It is going to mean a lot to me [if I can win the final].

"I am definitely looking forward to playing another big final and I hope I can turn it my way this time."

A solitary break of serve was enough for Zverev to claim the opening set.

He recorded two breaks in the second to go 4-1 up and although Thiem got one strike back, two more holds gave Zverev - who forced 11 break points to his opponent's two - a big victory.

The world number six is yet to drop a set this week but has lost his last three Masters 1000 finals going into his latest attempt on Sunday.

Thiem, meanwhile, has reached the Madrid Open semi-finals in four straight years but it still waiting for his first triumph at the tournament.

Rafael Nadal saw off Alexei Popyrin to reach the Madrid Open quarter-finals on a day that saw Daniil Medvedev and Stefanos Tsitsipas suffer surprise defeats.

World number two Nadal, chasing a record-extending sixth title on home soil, advanced 6-3 6-3 in a time of one hour and two minutes on Thursday.

Popyrin, playing in his first last-16 match at a Masters 1000 event, broke Nadal in the sixth game of the opening set but the Spaniard otherwise looked comfortable.

Nadal converted four of his six break points to advance through to the last eight for a 15th time, where Alexander Zverev awaits.

"It was difficult," Nadal said in his on-court interview. "The court today was slippery, it was very fast, very dry conditions. The ball was flying a lot. The beginning was super tough. 

"He was hitting every ball and hitting the spots. I'm happy with the victory. It was an important victory, he came here playing well. Every match is tough."

Zverev, who won the competition in 2018, beat British number one Dan Evans 6-3 7-6 (7-3) to set up a meeting with Nadal

However, second and fourth seeds Medvedev and Tsitsipas saw their participation come to an end at the hands of Cristian Garin and Casper Ruud respectively.

Medvedev, who is still yet to reach the quarters in Madrid, lost the only break of serve in the third game of the opening set but recovered by taking the second set in a tie-break.

Garin dominated the deciding set, the world number 25 breaking Medvedev twice and, after a short delay to fix a broken net, advanced 6-4 6-7 (7-2) 6-1.

Tsitsipas, who held championship point against Nadal in the Barcelona Open final, failed to break Ruud on a single occasion as he fell 7-6 (7-4) 6-4.

Alexander Bublik is next up for Ruud after beating Aslan Karatsev 6-4 6-3, while Matteo Berrettini - 7-6 (7-4) 6-4 winner against Federico Delbonis - will meet Garin.

Also vying for a place in the semi-finals are John Isner and Dominic Thiem, who are set to face off after beating sixth seed Andrey Rublev and Alex de Minaur respectively.

Andrey Rublev reflected on an "amazing feeling" as he booked a Monte Carlo Masters final appearance against Stefanos Tsitsipas.

The Russian has had a remarkable week at the Masters 1000 event that included a stunning win over 11-time champion Rafael Nadal in the quarter-finals.

Rublev continued his fine run with a 6-3 7-5 win over Casper Ruud on Saturday to ensure he will do battle against Tsitsipas in his first final at this level.

Tsitsipas comfortably saw off Dan Evans – who had beaten Novak Djokovic earlier in the tournament – winning his semi-final 6-2 6-1.

Rublev had 21 winners in his 80-minute victory over Ruud and has a record of 24-4 this season, the ATP Tour's best.

"It is an amazing feeling - it is my first [Masters] final, so I am really happy," said Rublev. 

"We will see what is going to happen [in the final]. I will try to do my best.

"Casper is a really amazing player, especially on clay. Since the beginning he put a really high intensity [on the court] and was really tough. 

"I knew that I needed to raise my level if I wanted to fight against him, because if I [did] not raise the level I [would] lose for sure."

Rublev defeated Tsitsipas in straight sets on his way to winning an ATP 500 title in Rotterdam last month.

Six of his eight ATP titles have come since the start of last year.

It took Tsitsipas, who has not won a tournament for 14 months, only one hour and nine minutes to see off the challenge of Evans, forcing 11 break points to the Briton's one.

"I am indeed pleased with the performance," Tsitsipas said, with the Greek yet to drop a set in Monte Carlo.

"I found ways to play at my best. It was really difficult to maintain my level of consistency and I am really happy I managed to deal with all the different moments during the match.

"I'm feeling good. I'm feeling energised. I still have plenty of gas and energy left in me. I was able to have all of my matches done in two sets, so that is a big plus. 

"I am happy to be able to play that way, just take it match by match, approach each individual match with the same intensity and energy - I'm really focused for Sunday."

Rublev has won three of his six career meetings with Tsitsipas and one of their two battles on clay.

Tsitsipas will be competing in his third Masters final, having lost to Nadal and Djokovic in his two previous appearances, the last of which came two years ago in Madrid.

Overall, Tsitsipas has won just five of his 13 ATP finals.

Rafael Nadal was dumped out of the Monte Carlo Masters as Andrey Rublev completed a superb 6-2 4-6 6-2 victory in their quarter-final clash.

Nadal went into the meeting with a 73-5 record at the event but Russian Rublev was in inspired form to stun his Spanish opponent.

The 11-time champion looked set to complete a trademark comeback after taking a 74-minute second set, yet Rublev held firm in the decider to claim a memorable victory after two hours and 33 minutes on court.

"I cannot imagine being in the situation of Rafa, knowing that you are the best player on clay and you have that pressure every time," Rublev said, according to the ATP Tour website.

"I think for him it must be incredibly tough every time. I am in shock [with] the way he is playing under this pressure and that is why he is a legend."

Rublev will face Casper Ruud in Saturday's semi-final after he overcame defending champion Fabio Fognini 6-4 6-3.

Dan Evans followed up his superb victory over Novak Djokovic on Thursday with a slender win over David Goffin to reach his first Masters 1000 semi-final.

World number 33 Evans, who had come into the tournament having lost his previous 10 matches on clay, overcame Goffin 5-7 6-3 6-4 in two hours and 42 minutes.

"I am proud of how I came back today, especially with what happened in the first set," he said after the match.

"I felt my concentration wasn't great and I am really happy with coming through. Yesterday would not have been worth it with a bad performance today."

Evans will face Stefanos Tsitsipas, who progressed when opponent Alejandro Davidovich Fokina retired injured in their quarter-final.

Spaniard Davidovich Fokina did not return for the second set after earlier receiving treatment during the first, which Tsitsipas won 7-5.

Top seed Stefanos Tsitsipas was made to sweat but got past Felix Auger-Aliassime in three sets to reach the Mexican Open semi-finals on Thursday.

World number five Tsitsipas, who was a semi-finalist at last month's Australian Open, defeated seventh seed Auger-Aliassime 7-5 4-6 6-3 in Acapulco.

In a tight contest, back-to-back double faults from Canadian sensation Auger-Aliassime in the eighth game of the third set proved costly as Tsitsipas broke after the pair had held serve throughout the last.

"It got really tight," Tsitsipas said in his post-game interview. "I got a bit lucky with the double faults towards the end of the match.

"I was just persistent. Towards the end I had zoned in 100 per cent. Both of us brought an amazing energy out on the court. Felix is someone I've played a lot and I have huge respect for him."

Greek star Tsitsipas will next play emerging Italian teenager Lorenzo Musetti for a spot in the ATP 500 tournament decider.

Qualifier Musetti, who upstaged third seed Diego Schwartzman in the first round, stunned fifth seed Grigor Dimitrov 6-4 7-6 (7-3) in the final match of the day.

The 19-year-old Musetti will now contest his maiden ATP 500-level semi-final as he prepares to enter the top 100 on the men's tour after just his fourth main-draw appearance.

Alexander Zverev – the German second seed – progressed to the semi-finals with a walkover after eighth seed Casper Ruud withdrew due to a wrist injury sustained in practice.

Zverev will play countryman Dominik Koepfer in the final four after he defeated Cameron Norrie 7-5 6-4, maintaining his run of not dropping a set all tournament.