Carlos Alcaraz confirmed his withdrawal from this week's Mexican Open due to a hamstring strain.

The reigning US Open champion, who missed the Australian Open with hamstring issues, was set to face Mackenzie McDonald in the opening round of the ATP 500 event in Acapulco.

Besides his injury frustrations, the teenager has enjoyed an impressive start to 2023, going 8-1 after triumphing in Buenos Aires and being runner-up to Cameron Norrie in Rio.

The latter event saw Alcaraz aggravate a hamstring problem, which has subsequently prevented him from building on that momentum this week. 

"Unfortunately I won't be able to play in Acapulco," the Spaniard posted on his social media channels. "I have a grade 1 strain in my right hamstring that will keep me out for several days, according to the tests we did this morning.

"I'm really sad I can't compete here, but now it's time to think about recovering and being ready as soon as possible. I hope to see you all soon!"

Norrie also confirmed he will not compete in Acapulco, the British number one citing fatigue as the reason for his absence.

"Unfortunately, I have to withdraw from Acapulco," he said in an Instagram story. "It's one of my favourite tournaments, so it's really tough for me to withdraw."

Novak Djokovic was made to work hard for his 18th consecutive victory, eventually putting away Tomas Machac in the first round of the Dubai Tennis Championships.

Djokovic, who is celebrating a record 378th week as world number one, had to rely on a third-set tie-break to finally get over the line, defeating his Czech opponent 6-3 3-6 7-6 (7-1) on Tuesday.

Machac is ranked 130th in the world, but caused Djokovic plenty of problems, earning 10 break points across the match, though he was only able to convert three.

Djokovic had a 4-1 lead in the deciding set before Machac fought back to force a tie-break, but the Australian Open champion ultimately had few problems at 6-6 as he won seven of the eight points played to clinch the win.

"Tomas certainly didn't play like the No. 130 in the world today," Djokovic said of his opponent. "He was giving me all kinds of trouble. But I guess when it mattered, I found another gear."

Djokovic, who is still undefeated in 2023, will face Tallon Griekspoor in the second round.

Elsewhere, fresh off two titles in as many weeks, third seed Daniil Medvedev eased past Matteo Arnaldi 6-4 6-2 to tee up a tie with Alexander Bublik next after his opponent Alexandar Lazarov retired hurt with Bublik leading 6-1 1-0.

Felix Auger-Aliassime defeated Maxime Cressy 7-6 (7-4) 3-6 6-3, but sixth seed Karen Khachanov is out after he was beaten 7-5 6-2 by Botic van de Zandschulp.

The Dutchman will take on Mikael Ymer in the second round after his 6-2 6-3 win against Francesco Passaro, while eighth seed Borna Coric and Dan Evans played just four games before the latter retired hurt.

Christopher O'Connell set up a match against Alexander Zverev in the next round after he overcame Emil Ruusuvuori 7-5 6-4.

Defending champion Andrey Rublev was able to find another gear to get through his first-round match at the Dubai Tennis Championships on Monday, beating Filip Krajinovic 7-5 6-2.

The number two seed got off to a rocky start, finding himself 5-2 down in the first set before dramatically turning the tide, winning five straight games.

Rublev's first serve percentage improved from 49 to 58 in the second set as he stepped up his game against his Serbian opponent.

"Filip is one of my good friends, and we always have tough battles," Rublev said after his win. "So, today I was going on court thinking that it was going to be a really tough match, and when he started the way he did, I didn't know what to do because he was playing so good.

"Somehow I calmed myself and said 'OK, restart at the bottom and raise my level', and I started to play much, much better. I was able to turn the match around and finish the match in a good way."

He will face Alejandro Davidovich Fokina in the second round after the Spaniard took just 52 minutes to beat Malek Jaziri 6-2 6-0, converting all five of his break points as he strolled to victory.

Seventh seed Alexander Zverev had to come from behind to beat Jiri Lehecka 4-6 6-3 6-4, while Tallon Griekspoor set up a second-round clash with top seed Novak Djokovic after the Dutchman beat Constant Lestienne 6-4 3-6 6-2.

Andy Murray has pulled out of the Dubai Tennis Championships, with the tournament citing the player's recurring hip injury as the reason.

Murray reached the final of the Qatar Open, which he lost 6-4 6-4 to Daniil Medvedev on Saturday, and had to play three sets in every match during his run to the showpiece.

The world number 52 impressed in Doha, including beating Alexander Zverev and saving five match points against Jiri Lehecka in his semi-final.

However, the toll on the 35-year-old seems to have led to his decision not to participate in Dubai, with the tournament beginning on Monday.

A statement from the tournament read: "We regret to inform you that Andy Murray is unable to participate in this year's tournament.

"Andy has been dealing with a recurring hip injury that has unfortunately forced him out of Dubai. We wish Andy a speedy recovery and hope to see him back on the court in Dubai soon."

Murray's win over Lehecka in Qatar meant he moved level with Jimmy Connors in fifth on the list for most ATP hard-court wins in the Open Era (489).

Cameron Norrie avenged last week's Argentina Open final defeat to Carlos Alcaraz by fighting back to beat the injury-hit Spaniard in a back-and-forth Rio Open final on Sunday.

Defending Rio Open champion Alcaraz was hampered by an injury to his right leg as he was pegged back after taking the opener, with Norrie eventually claiming a 5-7 6-4 7-5 win.

Alcaraz performed admirably despite seeing his movement limited in a nail-biting decider, but Norrie's power ultimately proved too much as the 27-year-old took his fifth ATP career title.

Top seed Alcaraz – playing in his 10th tour-level final at the age of 19 – started well and had forced seven break points by the time he took a thrilling first set, allowing Norrie just one.

With Alcaraz stopping to have his right thigh wrapped after appearing to be in discomfort, Norrie roared back and took the second set following three straight breaks of serve.

That teed up a dramatic finish, with Alcaraz playing a series of delightful drop shots to take the first break of the decider despite playing at walking pace for long periods. 

Alcaraz stopped to tear the wrapping off his leg as the pair traded breaks in front of a lively crowd in Brazil, but it proved a bridge too far for the Spaniard as Norrie pinned him back, hitting several excellent returns to claim his first final success against a top-10 ranked opponent.  

"It's so special to win this one, especially after losing a couple of finals already this year," Norrie told Amazon Prime Video. "I had to do it the tough way, you know? 

"I was looking done there and I just managed to flip a switch and turn it around. It's a good day, especially on a surface I'm not too comfortable with. I had to battle a lot of demons in the last couple of weeks."

World number two Carlos Alcaraz had to come from a set behind to defeat Fabio Fognini 6-7 (5-7) 6-2 6-4 on Thursday to advance to the Rio Open quarter-final.

The 19-year-old phenom has now won all five of his matches in 2023 after winning last week's Argentina Open, and the 2022 Rio champion is now three wins away from defending his title at South America's only ATP 500 event.

Against Fognini, Alcaraz lost the first set despite creating 11 break point opportunities, as his Italian opponent converted all four of his own chances in a back-and-forth battle. 

The Spaniard tightened up his service game down the stretch, only allowing Fognini one break point opportunity from the second and third frames combined, and he will now play Dusan Lajovic following his 6-2 6-4 win against Serbian compatriot Laslo Djere.

Chile's Nicolas Jarry is still yet to lose a set in the tournament, following up his impressive upset of third seed Lorenzo Musetti with a 6-2 6-2 triumph over Pedro Martinez.

Jarry will get a crack at another seeded opponent next when he takes on Argentina's sixth seed Sebastian Baez, who emerged victorious 7-5 7-6 (8-6) after two gruelling sets against Peru's Juan Pablo Varillas.

Fourth seed Francisco Cerundolo was eliminated 6-1 4-6 6-1 by Bernabe Zapata Miralles, who will meet Albert Ramos-Vinolas in an all-Spanish quarter-final after he fought off Daniel Elahi Galan 6-2 6-4.

Carlos Alcaraz finished the job against Brazilian wild card Mateus Alves to set up a second-round meeting with Fabio Fognini at the Rio Open.

Alcaraz's first-round meeting with Alves was halted on Tuesday due to heavy rain with the 2022 US Open champion leading 6-4 5-3, but the Spaniard clinched victory on Wednesday 6-4 6-4.

The top seed will take on 35-year-old Italian Fognini, who also was made to wait to secure his progress due to the Tuesday rain, eventually triumphing 6-2 6-3 over Chilean qualifier Tomas Barrios Vera.

Second seed Cameron Norrie endured a tough second-round tussle with local Thiago Monteiro, needing two hours and 30 minutes to triumph 7-5 7-5.

The Briton prevailed in one hour and 25 minutes in the first set against the 83rd-ranked Brazilian, while he was broken when serving for the match at 5-4 in the second frame.

Norrie, however, rallied to break straight back before securing victory after successfully serving the match out on the second attempt.

Fifth seed Diego Schwartzman was the major casualty of the day's play, going down 6-1 6-4 to Serbia's Dusan Lajovic in one hour and 29 minutes.

Brazilian veteran Thomaz Bellucci farewelled the ATP Tour after losing 6-3 6-2 to sixth seed Sebastian Baez.

Albert Ramos Vinolas, Bernabe Zapata Miralles and Hugo Dellien were also winners on Wednesday, with the latter progressing into the quarter-finals to face Norrie.

Novak Djokovic says his participation at the Indian Wells Open and Miami Open is "out of his control".

Djokovic, who last month won the Australian Open to move level with Rafael Nadal on 22 grand slam titles, has not played since claiming the title in Melbourne.

The world number one was nursing a hamstring issue throughout the season's first major, but he confirmed at a press conference in Belgrade on Wednesday that he will return to action at the Dubai Tennis Championships next week.

Djokovic could not compete in the United States last season due to his COVID-19 vaccination status, though his brother Djordje has claimed the 35-year-old has applied for a "special permit" to enter the country.

He has received clearance from the tournament organisers to play at the two Masters 1000 events at Indian Wells and in Miami but now faces a wait to find out if the U.S. government will grant him entry.

"The process for that has started. It is out of my control now," Djokovic said.

"I'd love to play and I'm glad I received the approval of directors in Miami and Indian Wells. I hope the decision makers will give the approval."

On his progress on the injury front, Djokovic explained: "As for the injury I sustained at the Australian Open, it's healed, but I'm not 100 per cent yet.

"Things are looking very good. As a team, we made the decision to go to Dubai."

Djokovic has won the Dubai Tennis Championships five times, though the last of those titles came in 2020.

He was knocked out by Jiri Vesely in the quarter-finals last year.

Djokovic this week tied Steffi Graf on 377 weeks spent as world number one.

The outright record is set to become his next week, with Carlos Alcaraz unable to surpass him even if the young Spaniard wins the Rio Open.

Sunday's Argentina Open champion Carlos Alcaraz was one game away from victory against Mateus Alves before heavy rain halted play at the Rio Open first round on Tuesday.

Alcaraz led 6-4 5-3 over the Brazilian wildcard, but was denied a shot at victory as rain interrupted play, which ultimately suspended for the day. Alcaraz's match is scheduled to resume on Wednesday afternoon local time.

The 2022 US Open champion had triumphed last week in Buenos Aires in his first tournament since November following injuries that kept him out of the 2023 Australian Open. Alcaraz is the reigning Rio Open champion.

Cameron Norrie, who Alcaraz beat in the Argentina Open final, progressed with a 7-5 6-1 win over Juan Manuel Cerundolo in one hour and 29 minutes.

Norrie had rallied from a 5-3 deficit in the first set to claim the opening frame, winning 10 of the final 11 games for victory.

Italian veteran Fabio Fognini's charge into the second round was also delayed on the brink of triumph, leading 6-2 5-2 against Chilean qualifier Tomas Barrios Vera when rain intervened.

Fourth seed Francisco Cerundolo won 4-6 6-3 6-3 over Roberto Carbellas Baena while Colombia's Daniel Galan and Peru's Juan Pablo Varillas were also winners on Tuesday.

Thiago Monteiro enjoyed a memorable victory on Monday as he defeated former world number three Dominic Thiem 6-1 3-6 7-6 (7-2) in his opening match of the Rio Open.

The highest-ranked Brazilian in the field made a winning start at South America's only ATP 500 event, but he had to work for it, emerging victorious after an 88-minute third set.

A raucous crowd cheered on every point down the stretch, and after saving four break point opportunities to force a tiebreaker, he jumped ahead to a 5-1 advantage and served it out.

He will face the winner between second seed Cameron Norrie and rising Argentine talent Juan Manuel Cerundolo in the next round.

Meanwhile, the top seed in action on Monday – third seed Lorenzo Musetti – continued his recent rough stretch of form with a disappointing 6-4 6-1 defeat at the hands of Chile's Nicolas Jarry.

Musetti, already ranked 18th in the world at 20 years old, has now lost four of his past five matches, while Jarry has won eight out of 10.

Jarry will play Spain's Pedro Martinez in the second round after he spoiled a potential all-Chilean matchup, eliminating Cristian Garin 7-6 (7-0) 6-4.

The only other Brazilian in action, Joao Fonseca, had no luck against Slovakia's Alex Molcan as he went down 6-0 6-3, while Bolivia's Hugo Dellien was similarly dominant in his 6-0 6-2 trouncing of Portugal's Joao Sousa.

After taking a set off world number two Carlos Alcaraz at last week's Argentina Open, Laslo Djere advanced into the second round as Facundo Bagnis retired in the second set while trailing 6-2 3-2.

Daniil Medvedev came from a set behind to beat Jannik Sinner in the Rotterdam Open final and land his 16th ATP Tour title. 

A 5-7 6-2 6-2 win for Medvedev gave the 27-year-old Russian his first trophy of the year, extending his career head-to-head record to 5-0 against Sinner.

The run from Medvedev this week has secured his return to the top 10 in the rankings, with the former number one set to go up three places to number eight on Monday.

Victory came in sharp contrast to Medvedev's last two appearances at the tournament, when he suffered first-round losses in 2020 to Vasek Pospisil and in 2021 to Dusan Lajovic.

Medvedev said after his win: "Thanks to all members of my team who are with me no matter what: some tough moments, some good moments, and we continue growing.

"The last two times I played here were terrible, and I'm happy to make it better this year."

Medvedev and Sinner's past meetings had curiously all come on indoor hard courts, as this also did.

Sinner won a title last week at the Open Sud de France in Montpellier, so the 21-year-old was not wanting for confidence as he looked to finally register a win over Medvedev.

The Italian out-rallied Medvedev at the end of the first set to snatch the vital break, but he could not ride that momentum into the early stages of the second.

An early break went the way of 2021 US Open winner Medvedev, whose remarkable defence was a key factor as the comeback gathered steam.

A double fault from Sinner handed Medvedev a 4-1 lead and a double break, nudging the match towards the decider.

When it came, first blood went to Medvedev as Sinner netted a backhand to give up a break in the third game.

The Moscow man saved a break point in the next game to stay ahead, and that setback left Sinner sapped, his challenge fading as Medvedev maintained an impressively high level.

Daniil Medvedev had no problems against Grigor Dimitrov as he eased into Sunday's Rotterdam Open final.

The former world number one took just 82 minutes to win 6-1 6-2, converting six of 13 break points against his Bulgarian opponent.

Medvedev rises back up to 10th in the world rankings after the win, and will go ninth if he can claim the title.

"It was an amazing match," Medvedev said after his victory. "The score [looks] easy, but the match was not. I felt physically like I was playing five sets.

"It would be amazing [to win the tournament]. Every time I come here, and I think it is my fifth time here, everywhere there are photos of the winners and their names.

"I don't remember who won it first time, but then Arthur Ashe won it [twice]. Then [John] McEnroe, [Bjorn] Borg, [Stefan] Edberg, and I'm like, 'Well, that tournament has a history for sure'. To add my name there would be amazing, but for this I need to play well in the final."

That final will be against Jannik Sinner after the Italian overcame spirited home wildcard Tallon Griekspoor.

It was Sinner's impressive serve that saw him through 7-5 7-6 (7-5), not facing a single break point, and ruthlessly taking the only one he carved out all match to take the first set.

He kept his nerve to see out a second set tie-break, and now has the chance to follow up last week's Open Sud de France title with another in Rotterdam.

Daniil Medvedev was at his brilliant best as he ended Felix Auger-Aliassime's title defence at the Rotterdam Open.

Former world number one Medvedev committed just five unforced errors in a 6-2 6-4 win on Friday that saw him progress to the semi-finals.

"Today was my best match of the week, but I have to build on this," Medvedev said afterwards.

"Usually, the best weeks you play, many times you're going to play your best tennis in the last match, so that's definitely a goal.

"But I'm happy with my level today, beating someone like Felix in straight sets."

He will next face Grigor Dimitrov, who needed three sets to see off Alex de Minaur.

Dimitrov saved two match points in claiming a 6-3 3-6 7-6 (8-6) victory but seemingly has an uphill challenge having lost four of his six matches against Medvedev.

"I kind of know the plan for the game,” Medvedev added of his clash with Dimitrov. "The thing is, he is going to try to do the same, to make up a good plan. If we take the last two matches, it's 1-1. So I always say a new match is a new match, no matter the head to head. 

"I'm preparing for a tough one tomorrow, he's such a great player and today was a great match from him, a great comeback actually. So I'm ready for the tough fight tomorrow."

Jannik Sinner was just as impressive as Medvedev, cruising to a 6-1 6-3 victory over three-time grand slam champion Stan Wawrinka.

Sinner, who won the Open Sud de France last week and has already dumped out top seed Stefanos Tsitsipas, will face Tallon Griekspoor after the Dutchman's win over fellow home hope Gijs Brouwer.

Defending champion Felix Auger-Aliassime must overcome a dismal record against Daniil Medvedev to go any further at the Rotterdam Open after both won on Thursday to set up a heavyweight quarter-final, while Stefanos Tsitsipas crashed out.

Third seed Auger-Aliassime beat French qualifier Gregoire Barrere 6-4 6-3, while Medvedev earned a 6-2 6-2 victory against Dutchman Botic van de Zandschulp.

Despite being the higher-ranked of the two at present, Canadian Auger-Aliassime has a 0-4 career record against Russian Medvedev.

Those losses include a painful defeat from two sets up in the 2022 Australian Open quarter-finals, and a US Open semi-final knockout blow in the previous season.

It is a record that is all the more surprising considering Auger-Aliassime has wins over Novak Djokovic, Rafael Nadal, Roger Federer, Andy Murray and Carlos Alcaraz to his name.

Auger-Aliassime sits eighth on the ATP ranking list, three places clear of former number one Medvedev, who is relishing their clash on Friday.

Medvedev said on Amazon Prime: "Felix is a top player. He won here last year and played amazing at the end of last season. I'm looking forward to a tough match, and hopefully I can be at my best.

"He's going to take his opportunities. He's going to go for it when he has the chance. So I will need to be at my best and everything has to be better."

Top seed and Australian Open runner-up Tsitsipas was beaten 6-4 6-3 by Jannik Sinner, with last week's Open Sud de France champion winning in an hour and 21 minutes to set up a quarter-final against Stan Wawrinka.

It was Sinner's first career win over a top-three opponent. The Italian held a 0-8 record against such opponents coming into this match.

Fourth seed Holger Rune is also out after retiring hurt while 6-4 4-0 down to Dutch wildcard Gijs Brouwer, who advances to play compatriot Tallon Griekspoor.

Australian Alex de Minaur advanced to the final eight with a 7-5 3-6 6-3 win over American Maxime Cressy, earning a shot at Grigor Dimitrov next.

Andrey Rublev suffered a first-round defeat to Alex de Minaur on a bad day for the big names at the Rotterdam Open.

Second seed Rublev won this event two years ago but there will be no such run this time around after his 6-4 6-4 loss on Wednesday.

De Minaur broke the world number five early in each set and sealed the win at the first time of asking, moving to a 3-0 head-to-head record against Rublev on hard courts.

The Australian will face Maxime Cressy in the next round, who bounced back from his Open Sud de France final defeat by beating Tim van Rijthoven.

Jannik Sinner saw off Cressy in that Montpellier showdown and the Italian carried that form into this tournament, though he needed three sets to overcome Benjamin Bonzi.

Frenchman Bonzi forced a decider but Sinner regained his composure in the final set to prevail 6-2 3-6 6-1 and set up a heavyweight clash with top seed Stefanos Tsitsipas.

There was no such progress for Alexander Zverev, who joined Rublev in suffering an early exit.

The German came unstuck 4-6 6-3 6-4 to home favourite Tallon Griekspoor, whose four wins over top-20 opponents have all come in Rotterdam.

Stan Wawrinka, the champion in 2015 and runner-up four years later, will face the winner of that tie, after he beat Richard Gasquet 6-3 6-3 to reach the quarter-finals.

Holger Rune reached the semi-finals in Montpellier, and like Sinner the fourth seed progressed into round two, claiming a routine straight-sets victory over qualifier Constant Lestienne.

"It was tricky. It's a lot about finding the rhythm here in the beginning of the tournament and first match you have to really be on your toes, especially I played a qualifier today who already has two matches in his bag," Rune said.

"It made it more difficult, but I'm happy how I handled every situation today."

Hubert Hurkacz was another seed to fall out, with the world number 10 going down 7-6 (7-4) 7-6 (7-5) to Grigor Dimitrov.