Dominic Thiem is ready to "get back on track" after testing negative for coronavirus.

The luckless Austrian revealed he had contracted COVID-19 after making a long-awaited return in the Andalucia Open Challenger Tour event last week.

Thiem has not played on the ATP Tour since last June, missing Wimbledon and the US Open in 2021 after undergoing wrist surgery.

The 2020 US Open champion, who was beaten by Pedro Cachin on his comeback in Marbella, on Thursday stated that he is now COVID-free.

"A short update: I am finally negative and I feel much better! Thank you for all your messages! I really appreciate it!" he tweeted.

"I'm going to have a medical check-up, so I can get back on track!"

Thiem has reportedly pulled out of the Monte Carlo Masters this week, but his return to the ATP Tour should be imminent with the French Open on the horizon next month.

Matteo Berrettini could miss the French Open after the world number six was forced to withdraw from three tournaments as he continues to recover from minor hand surgery.

The Italian progressed to the Wimbledon final in 2021 and started the new season in encouraging fashion as he reached the Australian Open semi-finals, where he was well-beaten by eventual winner Rafael Nadal.

However, the 25-year-old has seemingly struggled from then on, with his next best performance coming in Rio – where he made the last eight – as he limped to a 9-6 record so far in 2022.

Further difficulties followed for Berrettini after he sustained an injury to his right hand late in March, forcing him to withdraw from the Miami Open before undergoing a "minor operation".

Berrettini provided another update on Instagram on Thursday, revealing he would not feature at the Monte-Carlo Masters, scheduled to start later this week, or the Madrid Open and Italian Open at the start of May.

The latter tournament in Rome begins just two weeks before the second grand slam of the year, leading to concerns that Berrettini may not feature at Roland Garros.

"UPDATE – following advice from the medical experts, my team and I have decided that it is crucial I do not put time pressure on my recovery process," he posted.

"We have therefore decided I should withdraw from the Monte-Carlo, Madrid and Rome tournaments to ensure I give myself the proper amount of time to return at my highest level.

"Withdrawing from these events, particularly Rome, was an extremely tough decision, however it is the right one to ensure many more years of competing at the highest level for the biggest trophies.

"Thanks very much for all the support. My recovery process is on track and I look forward to seeing you on-court soon."

The 2022 French Open will provide Jo-Wilfried Tsonga with a final opportunity to shine in front of a home crowd after the 36-year-old confirmed his impending retirement.

Tsonga has suffered with injuries over recent seasons and has managed just two ATP Tour match wins so far in 2022.

The Frenchman reached a high ranking of world number five and finished as runner-up at the 2008 Australian Open.

He never won a grand slam but did reach five more major semi-finals. Tsonga has collected 18 singles titles on the ATP Tour, including two Masters 1000 crowns in Paris (2008) and Toronto (2014). His last triumph came in 2019 in Metz.

"It is with great emotion that I announce today my decision to stop my professional career at the next French Open," Tsonga wrote on social media.

"So many incredible moments, so much joy shared with a public that gave me a lot. Hoping for one last thrill with you!"

In a video accompanying his announcement, Tsonga said: "The goal is to be myself, to be Jo-Wilfried Tsonga the tennis player.

"I hope that I will stay in shape before and be able to be who I have always been at this tournament.

"I have always set myself high goals to try to get what I can. For me, this will be the opportunity to do it one last time."

Yannick Noah (69.6 per cent) is the only Frenchman to have a higher winning percentage in tour-level matches than Tsonga (66.5).

Nick Kyrgios continued his strong return to clay courts on Wednesday, defeating Tommy Paul 6-4 6-2 to progress to the quarter-finals of the US Men's Clay Court Championships in Houston.

Before Tuesday's victory over Mackenzie McDonald, Kyrgios had not played on clay since his infamous meltdown against Casper Ruud at the Rome Masters in 2019, where he threw a chair across the court and walked off during a change of ends.

The 26-year-old Australian wild card's serve kept him in relative control, saving all six break points he faced in the 70-minute match, as well as serving 10 aces and winning 88 per cent of points on his first serve.

"I had to be locked in today and I knew that I had to serve well," Kyrgios said post-match. "It's probably one of the better matches I've played on clay in my career, so I'm pretty happy with the way I came out here today, just put my head down and went to work.

"I've been serving really well, so I just wanted to keep to good habits."

The world number 94 will now face Michael Mmoh, who defeated Sam Querrey 6-2 6-4.

Meanwhile, third seed Reilly Opelka did it relatively tougher in the other all-American clash on Wednesday, coming back from a set down to defeat Mitchell Kreuger 3-6 6-2 6-4.

Opelka came into the match having lost just 13 service games in 19 matches this season, but was broken twice in the opening set against Krueger. The world number 18 has been dealing with a right shoulder injury that forced him to retire at the Miami Open against Francisco Cerundolo.

The 24-year-old still managed 15 aces for the match, including a big serve out wide in the Ad court on match point.

"He played well, I think he came out swinging," Opelka said afterwards. "I think he was free, I wasn't. It's a different situation.

"It was a good opportunity for him to play free and get a win and I'm a guy who hasn't always been the most consistent, especially changing surfaces, so I think it was a good win."

He will face Gijs Brouwer, who progressed past J.J. Wolf with a 6-1 6-1 win.

David Goffin will go up against three-time Grand Prix Hassan II champion Pablo Andujar for a place in the quarter-finals in Marrakech.

The former world number seven is in the hunt for a first title of the season, and defeated Damir Dzumhur 6-2 7-6 (7-3) in his first match on Wednesday.

That victory teed up a last-16 tie with Andujar, who defeated second seed Dan Evans in his first-round match.

The 36-year-old Spaniard is something of a specialist in Marrakech, having won this tournament three times, in 2011, 2012 and 2018.

Young Italian prospect Lorenzo Musetti overcame Andujar's compatriot Carlos Taberner 6-1 6-7 (3-7) 6-3 to become the first player to reach the quarter-finals.

Musetti, who reached the last 16 at last year's French Open and featured at the ATP Next Gen Finals, has had a tough start to 2022, only reaching one other quarter-final so far.

Serbian eighth seed Laslo Djere followed Musetti into the last eight by beating Malek Jaziri 6-4 6-2.

Qualifier Mirza Basic sprung a surprise to overcome Kamil Majchrzak 4-6 6-4 6-1, while Vit Kopriva defeated Bernabe Zapata Miralles in straight sets.

World number 172 Pavel Kotov claimed the scalp of a top-100 player, bouncing back from a first-set bagel to beat Tallon Griekspoor 0-6 6-2 6-2.

Nick Kyrgios made his return to clay with a win on Tuesday, defeating Mackenzie McDonald 4-6 6-3 6-4 at the US Men's Clay Court Championships in Houston.

It was the first time Kyrgios had played on clay since his infamous meltdown at the Rome Masters in 2019, where he threw a chair across the court and walked off, handing Casper Ruud a win by default.

After a meandering first set, the Australian world number 94 sparked into life when he saved the first of two break points with a second serve ace in the third game of the second. From there, Kyrgios opened up his shoulders and became more assertive from the baseline, as well as serving 18 aces in the closing two sets.

While again admitting clay is not his favourite surface, the 26-year-old was nevertheless pleased by the manner of the win against McDonald.

"He [McDonald] beat me in Washington where I used to play pretty well, and he's a tricky one because he doesn't make too many errors, and clay's obviously not my preferred surface," he said post-match.

"I just served really well, and just started playing more aggressive and found another gear. I would slip and slide a little bit, but my game actually suits the clay quite well."

While US seventh seed Tommy Paul secured a walkover 6-7 (4-6) 7-6 (7-5) 3-2 win against Peter Gojowczyk, Chilean fifth seed and defending champion Cristian Garin also came from a set down to beat Jack Sock 4-6 6-3 7-5.

American sixth seed Frances Tiafoe faced relatively simpler work, defeating unseeded countryman Marcos Giron in straight sets 6-4 6-4.

Two all-American matches also opened play in Houston on Tuesday, with JJ Wolf securing a 6-4 6-4 win over eighth seed Jenson Brooksby in the first, and Steve Johnson defeating Denis Kudla 6-3 4-6 6-4.

In light of recent high-profile misconduct, the ATP has warned players of harsher punishments for on-court behaviour in an internal note, as it also reviews its framework for stopping repeat offenders.

Nick Kyrgios was fined for audible obscenities and hurling his racquet onto the ground after his defeat to Rafael Nadal in Indian Wells – almost hitting a ballkid - while Alexander Zverev was thrown out of the Mexican Open in February after smashing his racquet repeatedly against the umpire's chair.

Jenson Brooksby also came under fire at the Miami Masters, throwing his racquet and hitting a ballkid in his win over Federico Coria, with Coria also motioning during the match that the consequent point penalty was not sufficient.

The recent spate of on-court outbursts has prompted the ATP to act.

"Effective immediately and as we head into the clay court swing, the ATP officiating team has been directed to take a stricter stance in judging violations of the Code of Conduct," ATP Tour chief Andrea Gaudenzi wrote in a circular to the players.

"Additionally, we are also undertaking a review of the Code, as well as the disciplinary processes, to ensure that it provides appropriate and up-to-date penalties for serious violations and repeat offenders."

Kyrgios was also fined after his loss to Jannik Sinner in Miami for criticising the umpire and smashing his racquet, and although Zverev was handed an eight-week suspension for his outburst in Acapulco, the ATP appears determined to nullify future misconduct.

While Gaudenzi, the Italian former top 20 player, understood the human elements to players competing under extreme pressure, he asserted the game itself should be taken into consideration.

"The first three months of the season have seen an unusual frequency of high-profile incidents involving unsportsmanlike conduct," Gaudenzi wrote.

"These incidents shine a bad light on our sport. This conduct affects everyone, and sends the wrong message to our fans, especially young fans."

Top seed Felix Auger-Aliassime cruised through his debut match at the Grand Prix Hassan II as Dan Evans crashed out in the first round.

World number nine Auger-Aliassime needed just an hour and 24 minutes to see off home hope Elliot Benchetrit 6-3 6-3.

He saved all six break points he faced to set up a second-round meeting with Slovak lefty Alex Molcan in Morocco.

But Evans' stay in Marrakech is over after he succumbed to a surprise 6-4 6-2 loss to Pablo Andujar. The Briton has now won just one of his last five matches on tour.

Lorenzo Musetti has endured a tough start to 2022 and headed into this tournament 5-7 on the year.

However, the 20-year-old delivered a reminder of his potential with a straight-sets win over fourth seed Albert Ramos-Vinolas.

Joao Sousa knocked out fifth seed Federico Delbonis but sixth seed Botic van de Zandschulp and eighth seed Laslo Djere did prevail, as did veteran Richard Gasquet.

Carlos Alcaraz said he never expected to have such a meteoric rise so early in his career after winning his first ATP Masters 1000 title at the Miami Open.

Alcaraz defeated Casper Ruud 7-5 6-4 in the final, making the 18-year-old the youngest ever winner in Miami, beating Novak Djokovic's previous record when he won it aged 19.

With the win, Alcaraz jumped all the way up number 11 in the world.

Speaking to Tennis Channel after his triumph, Alcaraz said he has already exceeded his goals for this season.

"Of course, I did not expect this," he said.

"My goal was to end this year in the top-15, and now I'm at 11, close to the top-10. I'm going up so fast, and I think it's [because of] all the hard work I'm putting in every day.

"Of course my experience from last year has helped me a lot – playing Rafa (Nadal) in Madrid, against (Alexander) Zverev in Acapulco – you have to live that experience to learn.

"When I started playing tennis when I was five or six, I wanted to be number one in the world, and this year I've realised I can beat the top players in the world."

Alcaraz was buoyed by the presence of his coach, former world number one Juan Carlos Ferrero, who surprised him the day before the final after being absent throughout the tournament, mourning the death of his father back in Spain.

"Juan Carlos [Ferrero] played everything that I'm playing, he has experienced all that I am experiencing right now, so he has helped me a lot," he said.

"It's amazing to have Juan Carlos here with me – I talk with him every day, but it was a surprise when he arrived, I didn't know anything.

"It was a big surprise and I was really happy [to see him] – I'm really happy to win my first Masters 1000 title with him here."

With the young Spaniard now drawing comparisons to Spanish superstar Rafael Nadal, Alcaraz said it can only be a good thing.

"If people are comparing you with Rafa, that means you are doing great things, and you are doing it the right way," he said.

"I'm trying to not think about that – Rafa is Rafa, and I am Carlos Alcaraz – Rafa is one of the best players in the history of tennis, and I am a young man living his dream.

"I looked up to Rafa when I was young, he inspired me a lot, watching his big matches, so to be around him in the tour, and to be able to play against him, is pretty special."

Carlos Alcaraz became the youngest Miami Open men's champion as the teenage Spaniard continued his rapid rise by fending off world number eight Casper Ruud.

A 7-5 6-4 victory in Sunday's final gave 18-year-old Alcaraz the third ATP singles title of his career, after winning the 2021 Croatia Open and the Rio Open in February this year.

Alcaraz's maiden Masters 1000 title saw him secure Miami glory even earlier than Novak Djokovic, who was 19 at the time of his 2007 triumph.

"I have no words to describe how I feel – it feels so special to win my first Masters 1000 here in Miami," Alcaraz said.

While he got the job done in the end, there was far from a smooth start for Alcaraz, who lost the first three games of the opening set as Ruud grabbed the early break.

Down 4-1 in that first set, Alcaraz then rattled off three consecutive games to tie it back up, and after breaking again to go up 6-5, he held his nerve to save a break point and move ahead in the contest.

Ruud had issues dealing with Alcaraz's first serve all match long, but it was most dominant in the first set, the Spanish player winning 76 per cent when landing his first serves, while Ruud was down at 54 per cent.

Alcaraz flipped the script in the second set and jumped out to a 3-0 lead with a double break. Ruud was able to get one break back, but he never threatened the rest of the way as Alcaraz closed it out in style, conceding only two points from his last three service games.

Speaking on the court after his win, Alcaraz was overjoyed as he acknowledged a large contingent of support in the crowd, including coach Juan Carlos Ferrero.

"I have my whole team with me, and my family… this is the second tournament that they've all been here with me," he said.

"Thank you to my team, I'm glad to have my father here with me and to be able to share this moment with my family."

Touching on some of his strategy, Alcaraz said the plan was to try and avoid Ruud's dominant forehand as much as possible.

"I knew Casper is playing unbelievable, and has a big forehand, so I tried to play to his backhand first, and attack all the time," he said.

"I'm always trying to attack, and not let him dominate the match with his forehands down the line – that was a pretty big key for me."

With the win, Alcaraz becomes the world number 11, and does not turn 19 until next month.

Daniil Medvedev has confirmed he will undergo a procedure to fix a troubling hernia issue, which may keep him out of the French Open.

Medvedev, who enjoyed a short-lived stint as world number one at the start of March before relinquishing the crown back to Novak Djokovic, reached the quarter-finals at Roland Garros last year.

However, the chances of the Russian appearing in Paris now seem slim, given he faces up to two months out of action following the impending operation.

This year's French Open runs from May 22 until June 5.

"Hi everyone," the world number two tweeted on Saturday. "The last months I have been playing with a small hernia.

"Together with my team I have decided to have a small procedure done to fix the problem. I will likely be out for the next 1-2 months and will work hard to be back on court soon. Thanks for all the support."

Medvedev had been hoping to use the clay court swing to reclaim top spot in the ATP rankings.

He could have done so had he reached the semi-finals of the Miami Open last week, yet the 26-year-old lost 7-6 (9-7) 6-3 in the quarters to Hubert Hurkacz.

Medvedev appeared to be struggling in that tie and after the defeat he told reporters: "All the match I was not feeling my best. But, you know, sometimes it happens.

"I don't know the actual reason. Maybe the heat. But I was feeling super, like, dizzy, tired, and there was this long game where I couldn't serve anymore.

"Then in the locker room I was cramping quite much, so physically was not easy. But at the same time, that's part of the game."

Should Medvedev fail to return in time to make the season's second grand slam, the reigning US Open champion will hope to be fully firing by the time Wimbledon comes around in late June.

Daniil Medvedev missed the chance to return to the top of the rankings as he was beaten by Hubert Hurkacz in the quarter-finals of the Miami Open on Thursday.

Medvedev would have become world number one once again if he had defeated Hurkacz, but the defending champion won 7-6 (9-7) 6-3 on Hard Rock Stadium.

Novak Djokovic will remain the top-ranked male player on the planet thanks to Pole Hurkacz, who levelled his head-to-head record with the Russian at 2-2.

Carlos Alcaraz or Miomir Kecmanovic will do battle with eighth seed Hurkacz, who won 74 per cent of points on his first serve and broke Medvedev's serve three times, for a place in the final.

Hurkacz's win over the top seed was his second against a top-two player, with the first also coming against Medvedev at Wimbledon last year.

"I think the return was crucial. I was able to make a lot of returns and get some free points on my serve, because having rallies with Daniil is fun, but they get long,” Hurkacz said on his on-court interview.

"It is good I was able to get some free points. I have spent a lot of time in Florida, so I am used to the humidity. I think the conditions were in my favour today, so I tried to use them."

Casper Ruud set up a semi-final with Francisco Cerundolo at the Miami Masters after he defeated Alexander Zverev 6-3 1-6 6-3 on Wednesday.

Ruud's heavy topspin game gave Zverev problems initially, contributing to a 94 per cent success rate from points on his first serve, while Zverev struggled to find rhythm on serve at 58 per cent.

Saving two break points in the opening game of the second seemed to spark Zverev into life, but Ruud was able to regroup and continue dominating from the baseline in the third to comfortably see his way through.

"It was great to get that break early on [in the third set] and I was able to keep it all the way out," Ruud said post-match. "I was serving well. I can thank my serving for the win today."

The Norweigian world number eight lost his first three ATP 1000 quarter-finals on hard court, but played with confidence on the back of a 75 per cent first-serve rate.

He will face Cerundolo, who also advanced into the semi-finals on Wednesday, after Jannik Sinner was forced to retire due to foot blisters. The Argentine was leading 4-1 in the first set after 23 minutes when Sinner called the match.

The world number 103 held a 0-2 record on hard courts prior to this week, but has now made his first ATP 1000 semi-final in as many attempts after progressing past Tallon Griekspoor, Reilly Opelka, Gael Monfils and Frances Tiafoe.

Cerundolo has enjoyed a strong start to 2022, with respective quarter-final and semi-final appearances on clay in Buenos Aires and Rio de Janeiro.

The winner of the upcoming semi-final will make their first ATP 1000 final appearance, while Ruud was able to beat Zverev at third time of asking, losing the opening two games head-to-head.

Dominic Thiem's bad luck continued as the former world number three confirmed he has tested positive for COVID-19.

Thiem only made his return to action on Tuesday, having not featured on the ATP Tour since June last year.

The Austrian underwent surgery on a wrist injury that kept him out of Wimbledon and also prevented him from defending his US Open title, while he also missed this year's Australian Open.

Having opted to push back his comeback further by skipping Indian Wells and the Miami Open, Thiem instead decided to play at the Challenger Tour's Andalucia Open.

His return was short-lived, as Thiem went down 6-3 6-4 to Pedro Cachin.

And Thiem will now face another spell out, after revealing he has contracted coronavirus.

"Looks like lately the good news don't last long... last night after dinner, I started feeling unwell and didn't have a good night," Thiem wrote on his official Instagram account.

"After developing mild symptoms I decided to take a test this morning, which came back positive for COVID-19.

"Now I have to wait and see how it develops. I'll keep you posted. Thank you all in advance for your support!"