The top seeds were all victorious in Thursday's action at the Atlanta Open, with John Isner prevailing 7-6 (10-8) 4-6 7-6 (7-3) in an all-American showdown against Ben Shelton to close the day's play.

Isner, 37, relied as he usually does on his trusty serve to get the job done in tiebreakers, winning the match despite not breaking Shelton's serve a single time.

The second seed won 85 per cent (60-of-71) of his successful first serves, while Shelton was similarly stout, converting 83 per cent (50-of-60).

Isner will meet fellow American Jenson Brooksby in the quarter-finals after he came back from an early break to defeat Mackenzie McDonald 6-3 6-4.

The biggest differentiating factor between the two players was Brooksby's effectiveness off his second serve, winning 61 per cent (14-of-23) of those opportunities compared to just 22 per cent (four-of-18) from McDonald.

Fourth seed Alex de Minaur defeated fellow Australian James Duckworth 6-4 6-4 in a competitive match, but De Minaur simply created more chances for himself, with five break point opportunities while Duckworth had two.

De Minaur will play France's Adrian Mannarino after he defeated American Andres Martin 7-5 6-3.

Mannarino's main advantage was with his return game, securing four breaks of serve while dropping his own serve only once.

Carlos Alcaraz got his Croatia Open title defence off to a strong start with a straight-sets victory over Norbert Gombos on Thursday.

The Spaniard, who this week became the second-youngest player to break into the top five of the ATP rankings this century, behind only compatriot Rafael Nadal, saw off Gombos 6-2 6-3 in Umag.

Alcaraz, handed a first-round bye, will now face Facundo Bagnis in the last eight after the Argentinian beat Corentin Moutet 6-3 6-1.

Despite the straightforward nature of his victory over Gombos, the top seed was regularly tested on his own serve.

"It was a really tough match," said Alcaraz, whose triumph in Umag last year marked his first ATP Tour-level title.

"It wasn't as easy as the result seems. Norbert played a really good game and the first round of every tournament is never easy. 

"I had to get used to the conditions. It was tough for me, but at the end I found a way to play better and get the win."

Franco Agamenone also advanced to his first ATP Tour quarter-final with a 3-6 6-1 7-5 comeback over Sebastian Baez, while Marco Cecchinato upset Lorenzo Musetti 6-4 6-3.

At the Austrian Open, Dominic Thiem was eliminated in the quarter-finals of his home tournament by Yannick Hanfmann, the former world number three going down 6-4 3-6 6-4 in a rain-affected contest.

Roberto Bautista Agut prevailed 4-6 7-5 7-5 against Jiri Lehecka in a match lasting nearly three hours. A meeting with fellow Spaniard Albert Ramos-Vinolas, who defeated Pedro Martinez 6-4 6-2, is his reward.

It was smooth sailing for the seeded competitors in action on Wednesday at the Atlanta Open, with Tommy Paul, Frances Tiafoe and Brandon Nakashima all advancing in straight sets.

Fifth seed Paul started the day off with a straightforward 6-3 6-3 win against South Korea's Kwon Soon-woo thanks to a clear advantage with his serving. He won 73 per cent (36-of-49) of his points on serve, while Kwon could only muster 53 per cent (34-of-64).

Paul will meet Belarus' Ilya Ivashka in the quarter-finals after he successfully navigated the challenge of America's Steve Johnson 4-6 6-2 6-4 after Johnson was a late injury replacement for top overall seed Reilly Opelka.

Ivashka is now 6-3 in his nine matches since the French Open, with his only losses against top-five talents Stefano Tsitsipas and twice against Daniil Medvedev.

Fourth seed Tiafoe was impressive against Japan's Taro Daniel, creating eight total break point opportunities, and capitalising on three. 

Tiafoe will play Nakashima in the quarter-finals, with the American surviving a tough first set tiebreaker to eventually defeat Australia's John Millman 7-6 (10-8) 6-4.

In a closely contested match, Nakashima avoided getting into many sticky situations, saving the only break point he faced.

Dominic Thiem battled his way into the quarter-finals of the Austrian Open at the expense of compatriot Sebastian Ofner on Wednesday.

Thiem reached his first semi-final since May 2021 at the Swiss Open last week and is looking to make further strides on home soil this week, having endured an injury nightmare.

The 2020 US Open champion made it through to the last eight in Kitzbuhel but had to dig deep for a 6-2 3-6 6-3 victory over qualifier Ofner.

Thiem only lost one point in the opening two games and wrapped up the first set in commanding fashion, but Ofner claimed the only break of the second set to force a decider.

The former world number three twice came from a break down in the final set to ensure he will face Yannick Hanfmann for a place in the semi-finals.

Seeds Aslan Karatsev and Joao Sousa bowed out, losing to Dusan Lajovic and Jiri Lehecka respectively.

Spanish trio Roberto Bautista Agut, Albert Ramos-Vinolas and Pedro Martinez advanced in straight sets.

Two of the top five seeds were knocked out of the Croatia Open, with Holger Rune and Alex Molcan falling in the round of 16.

Bernabe Zapata Miralles got the better of third seed Rune 3-6 6-3 6-2, while Roberto Carballes Baena ousted Molcan 3-6 6-2 6-3. Jannik Sinner and Giulio Zeppieri secured their quarter-final spots in Umag.

Dominic Thiem started his bid for a second Austrian Open title with a comfortable triumph over Alexander Shevchenko.

Thiem, a 2019 winner at the tournament in his home country, prevailed 6-4 6-2 in Kitzbuhel.

He will next face compatriot Sebastian Ofner as he seeks a first title since his grand slam breakthrough at the US Open in 2020.

Ofner came from a set down to beat former world number seven Richard Gasquet 1-6 7-5 7-5.

Meanwhile, seventh seed Pedro Martinez saved six out of six break points en route to a 7-6 6-3 victory over Chilean Nicolas Jarry.

At the Croatia Open in Umag, Bernabe Zapata Miralles set up a round of 16 meeting with third seed Holger Rune by beating Croatian Dino Prizmic, who retired when facing a 6-4 3-0 deficit.

Alex Molcan is safely through to the next round after defeating Duje Ajdukovic, while French 23-year-old Corentin Moutet cruised to a straight-sets victory over sixth seed Daniel Altmaier.

Brandon Nakashima needed all three sets to deal with gritty Australian Jordan Thompson, ultimately prevailing 7-6 (7-5) 3-6 6-3 in the first round of the Atlanta Open.

America's Nakashima – who took Nick Kyrgios to five sets at Wimbledon – was the highest seed in action as things kicked off on Monday, and the difference in the match proved to be his quality ground strokes.

Both players won at least 79 per cent of their successful first serves, but while Thompson's effectiveness dipped to 39 per cent on his second serve, Nakashima's stayed up at 65 per cent, only allowing two break point opportunities all match.

Nakashima will meet John Millman in the next round after Millman defeated fellow Australian Alexei Popyrin 7-6 (7-1) 4-6 6-3.

Popyrin clearly had the serving advantage, winning the ace count 12-to-four, but in a match where each player only one had break of serve each, Millman found the important points when it really mattered.

Japan's Taro Daniel came back from a rough start to handle the challenge of America's Sebastian Korda 1-6 6-1 6-3.

Korda was in total control early, winning 12 of his 13 points on serve (92 per cent) in the opening set, but that number dipped sharply to 37 per cent (13-of-35) as Daniel turned the match on its head and found a way to counterpunch the American.

The last singles contest saw Kwon Soon-woo win a hard-fought clash with Marcos Giron 7-6 (7-3) 4-6 7-5. The match was so closely contested that Kwon won 51 per cent of the total points (104-of-204), while Giron won 49 per cent (100-of-204).

Meanwhile, Kyrgios was the biggest name in action, taking the doubles court in his Australian Open-winning partnership with Thanasi Kokkinakis, defeating Nicolas Mahut and Edouard Roger-Vasselin 7-6 (10-8) 6-3.

Former world number 17 Cristian Garin was beaten 6-4 7-5 by Federico Coria in the first round of the Austrian Open in Kitzbuhel, while Matteo Berrettini and defending champion Casper Ruud withdrew from the tournament.

2017 runner-up Joao Sousa cruised past Vit Kopriva 6-1 7-5 and Jurij Rodionov set up a Round of 16 meeting with third seed Roberto Bautista Agut with a straight-sets victory over Hernan Casanova.

Dominic Thiem, who won the 2019 edition of the competition, will face Alexander Shevchenko tomorrow while Richard Gasquet will take on Sebastian Ofner.

2016 Croatia Open winner Fabio Fognini will not be regaining his title in Umag this year, after the seventh seed was knocked out by Colombian Daniel Galan in a 3-6 7-5 3-6 defeat.

Galan will play Giulio Zeppieri in the next round, who came from one set down to overcome world number 90 Pedro Cachin 3-6 6-1 6-4.

Fifth seed Alex Molcan plays his first game tomorrow against Duje Adjukovic, and sixth seed Daniel Altmaier will take on French 23-year-old Corentin Moutet.

Carlos Alcaraz has his sights set on climbing to the summit of the ATP rankings after becoming the youngest player to crack the top five since Rafael Nadal.

The Spaniard was downed in the Hamburg European Open final by Lorenzo Musetti over the weekend but nevertheless saw a rise in his stature to a career-high position of fifth.

In doing so, it makes the 19-year-old the second-youngest male to break into the top five this century, trailing only Nadal and bettering Novak Djokovic by a matter of months. 

"It means a lot," Alcaraz stated. "The hard work that I put in every day for reaching my dreams, [number] 1, and little by little I'm reaching my dream.

"Top five for me is pretty amazing and I will keep going to be [number] 1."

Had Alcaraz won in Hamburg, he would have risen to fourth, while other movements in the rankings include a rise to number 31 for Musetti and a return to the top 200 for Dominic Thiem, at number 199.

Lorenzo Musetti won the first ATP Tour title of his career as he defeated fellow up-and-comer Carlos Alcaraz in Sunday's Hamburg European Open final.

Top seed Alcaraz ensured he would become the youngest player in the top five of the ATP rankings since Rafael Nadal in 2005 with his semi-final victory over Alex Molcan.

But the 19-year-old paid the price for an error-strewn display on Sunday, as Musetti, 20, took the crown 6-4 6-7 (6-8) 6-4.

Alcaraz was guilty of a slow start on the clay, with four wild unforced errors helping Musetti go a break up after the very first game. Although the Spaniard instantly hit back, his opponent gobbled up his next break point to take a 4-3 lead en route to winning the set.

Musetti then took charge early on in the second to go 2-0 ahead, but Alcaraz showed admirable resolve to see off a couple of match points and level the set at 5-5, before remarkably tying the contest in a tie-break that saw three more championship points squandered.

The deciding set was evenly contested almost throughout, until Musetti broke serve to make it 6-4 and take the match on his sixth championship point as Alcaraz hit a backhand long.

On a momentous day for the Italian, his jubilation was plain to see as he spoke afterwards.

"I have no words because it was a rollercoaster until the end," Musetti said on court. "I had so many match points. Carlos was so good on the match points, [I had] so many chances.

"But I think the key of the match was to keep calm and [have] all the patience [with] myself because it was really not easy.

"Carlos was putting so much effort in the match points when he was down, so it was not easy to find the energy to come back.

"But I cannot describe what I am feeling right now. I think I am still dreaming."

On the subject of the five match points he surrendered, Musetti added: "Of course I was really upset, but I tried to not show my opponent my reaction.

"I tried to forgive [myself for] all the match points and all the points [when] I couldn't do it. I think that was the most [important] thing, even for me, because I didn't expect the win after all this rollercoaster, so I'm super happy to be here and to be the champion."

Musetti and Alcaraz could end up meeting again in the coming week in Umag, where the latter is the defending champion and top seed.

Casper Ruud mounted an impressive comeback to defend his Swiss Open crown, after seeing off Matteo Berrettini in a three-set thriller in Gstaad.

The Norwegian, the beaten finalist at this year's French Open, made it successive triumphs at Roy Emerson Arena, after overcoming a first-set deficit to win 4-6 7-6 (7-4) 6-2.

It takes clay specialist Ruud to an eighth overall title on the surface and a third of the year, following victories at the Argentina Open in February and Geneva Open in May.

For Berrettini – also chasing a third title of the year after victory at the Stuttgart Open and Queen's – he will be left to rue letting his first-set advantage slip, after getting the drop on his rival.

The Italian was competing in his first event since he was forced to withdraw from Wimbledon with COVID-19, and made an impressive start under glorious sunshine on Sunday.

Yet Ruud was able to take him to the wire in the second set, before breaking his serve twice in the decider to emerge triumphant in Gstaad for the second year in a row in the end.

Former tennis star Mardy Fish said he was "proud" to be the first person to play on both the ATP Tour and the PGA Tour after swapping his racquet for a bag of clubs.

The 40-year-old won six ATP titles and once ranked as high as seventh in the world in 2011, before retiring from tennis four years later.

However, he has recently been playing amateur golf and was given a special exemption to play in the PGA Tour's 3M Open in Minnesota, his hometown.

Fish was unable to make the cut, finishing 13 over par after his two rounds, with only three players carding higher scores.

He was grateful for the opportunity, though, and took to Twitter on Saturday to reflect on his achievement, posting: "What an incredible experience playing in the 3M Open. Truly a week I will never forget.

"I'm proud to be the first person to play on the ATP Tour and the PGA Tour. Chase your dreams, no matter how ridiculous they may be! Thank you for the incredible support all week Minnesota!"

Although he did not quite perform to the level hoped, Fish did card a respectable 74 in Friday's second round, hitting eight of 14 fairways and seven of 18 greens in regulation.

Golf great Jack Nicklaus has previously labelled Fish the best non-professional golfer he has ever played with.

"We played nine holes, and he drove the ball on every single hole in the middle of the fairway; further than I have seen anybody hit it who is not a professional," Nicklaus said.

"He shot 31 for nine holes. I said, 'Mardy, what are you doing? You have got a talent, and you are young enough to take advantage of it. You need to go play golf.'"

Carlos Alcaraz will play Lorenzo Musetti in the Hamburg European Open final following a straight-sets victory over Alex Molcan on Saturday.

The Spanish teenager is targeting a fifth ATP title of the year, which would move him ahead of Rafael Nadal, having already triumphed in Rio, Miami, Barcelona and Madrid.

Alcaraz is set to move into the top five of the ATP rankings for the first time after seeing off Slovakia's Molcan 7-6 (7-2) 6-1 to reach yet another championship match on his debut in Hamburg.

The top seed broke twice in the opening set but was pegged back on both occasions by Molcan, who was striving to reach a third final of 2022 after finishing as runner-up in Marrakech and Lyon.

But the 19-year-old dominated the tie-break, and found another gear to storm into the final as he made it eight successive sets won this week.

"It was tough," Alcaraz said. "Obviously, [Alex] played really well. The first set was really close; I'm really happy to be able to end the first set playing well.

"I couldn't read the drop shots from him. He was better on the drop shots today, so I was a little bit [frustrated] in the first set.

"In the second set, I think he was down a little bit; he didn't play well. I finished the match with a lot of confidence and played very well."

Standing between Alcaraz and another title is Musetti, who will appear in his maiden ATP final after he overcame Francisco Cerundolo 6-3 7-6 (7-3).

The Italian, who is set to climb into the world's top 50 for the first time, had lost six consecutive ATP Tour matches prior to this week.

But the 20-year-old continued his resurgence; ending the Bastad champion's eight-match winning streak by roaring back from 3-1 down in a second-set tie-break.

Meanwhile, Matteo Berrettini and Casper Ruud will target a third title of 2022 when they lock horns in the Swiss Open showpiece.

Berrettini - a winner in Stuttgart and Queen's before a positive COVID-19 test ruled him out of Wimbledon - registered his 12th successive victory, putting former US Open champion Dominic Thiem to the sword 6-1 6-4 in 78 minutes.

Reigning champion Ruud raced past Albert Ramos-Vinolas; winning five out of seven break points in a resounding 6-2 6-0 triumph.

Carlos Alcaraz outclassed Karen Khachanov to reach the semi-finals of the Hamburg European Open, while Matteo Berrettini will face Dominic Thiem in the last four at the Swiss Open.

Top seed Alcaraz only needed an hour and nine minutes to beat Russian Khachanov 6-0 6-2 in a clay-court masterclass on Friday.

The 19-year-old Spaniard moved a step closer to winning a fifth title this year with a dominant performance, breaking the Russian five times in a one-sided contest.

Alcaraz hit 21 winners as Khachanov was given a harsh lesson and the teenager will next face Alex Molcan, who was 2-0 up in the second set after winning the first on a tie-break when Borna Coric retired due to injury.

"I played unbelievable today, probably one of my best matches this year," Alcaraz said of his win against Khachanov. "I'm pretty happy with the performance that I'm playing in this tournament. Yesterday [a victory over Filip Krajinovic] was amazing as well.

"I'm training every day to be solid and at the same time to be aggressive. That is my game."

Francisco Cerundolo and Lorenzo Musetti will contest the other semi-final in Hamburg after beating Aslan Karatsev and Alejandro Davidovich Fokina respectively.

A rejuvenated Thiem is enjoying another hugely encouraging week and will take on Berrettini in his first semi-final of the year following a 6-4 6-3 defeat of Peruvian qualifier Juan Pablo Varillas in Gstaad.

Austrian Thiem has not played in a final since winning his only grand slam at the 2020 US Open, but he claimed his first ATP-level victory for 14 months in Bastad last week and is through to his first semi-final since May 2021 after bossing the baseline battle with Varillas.

It was not all plain sailing for Berrettini, who roared back to beat Pedro Martinez 3-6 7-6 (7-5) 6-1 after the Spaniard was in command of a second-set tie-break at 5-1, but the second seed extended his winning run to 11 matches.

Top seed Casper Ruud got the better of Jaume Munar 7-6 (7-3) 7-6 (7-4), booking a showdown with Albert Ramos-Vinolas, who came through a three-set battle with Nicolas Jarry.

Andrey Rublev crashed out of the Hamburg European Open in straight sets against Francisco Cerundolo, as top seed Carlos Alcaraz cruised past Filip Krajinovic to reach the quarter-finals.

Second seed Rublev was the latest scalp of Cerundolo's fine run of form, the Argentine making it seven consecutive wins by wrapping up a 6-4 6-2 success in just an hour and a half in Germany.

Having furthered his momentum with a second top-10 win in as many weeks, Cerundolo said: "It is the first time it has happened for me. I am playing against the top guys and I am playing well, it is unbelievable."

Cerundolo will face Aslan Karatsev in the last eight after he recovered from a set down to beat Daniel Elahi Galan 3-6 6-3 6-4.

World number six Alcaraz fared better than Rublev, registering a 7-6 (7-4) 6-3 win over Krajinovic to tee up a final-four meeting with Karen Khachanov, who beat Fabio Fognini in straight sets.

Meanwhile, a host of big names including Casper Rudd and Matteo Berrettini reached the last eight of the Swiss Open in Gstaad, as Dominic Thiem continued his revival with a win over Federico Delbonis.

Thiem reached his second quarter-final in as many weeks with an impressive 7-6 (8-6) 6-3 triumph despite letting a 5-2 lead slip in the opener, registering his first tour-level straight-sets victory since May 2021.

Having set up a meeting with Juan Pablo Varillas, the 2020 US Open champion beamed: "I have won two matches which means a lot to me right now, I really need those ranking points. Every match win is something very special."

The Austrian will be joined in the next round by first and second seeds Ruud and Berrettini, who eased past Jiri Lehecka and Richard Gasquet respectively.

Spanish duo Albert Ramos-Vinolas and Pedro Martinez also both progressed to the last eight despite dropping a set, with the latter setting up an enticing clash with Berrettini on Friday.

The men's tennis tour has scrapped plans to stage four tournaments in China later this year as the pandemic continues to take its toll on the sporting calendar.

Mandatory quarantine rules make it unfeasible for international players and tour officials to travel to the events, including the Shanghai Masters, a top-tier ATP 1000 tournament.

The lucrative Shanghai event had been due to run from October 9-16 and would have featured many of the world's top players.

Also cancelled are the Chengdu Open and the Zhuhai Championships, which were scheduled to begin on September 26, and the China Open, billed for the following week.

The ATP said it had cancelled the three-week China swing "due to ongoing restrictions related to COVID-19".

It marks a third successive year in which the run of tournaments has had to be cancelled, with China last hosting ATP events in 2019, before the pandemic hit.

At the same time as it cancelled the tournaments in China on Thursday, the ATP made provision for its players to keep earning by announcing six new events to take place in September and October.

Those events will be played in San Diego, Seoul, Tel Aviv, Florence, Gijon and Naples, the ATP said, with all at ATP 250 level, the lowest rung of the main tour.

The WTA, which runs the women's tour, announced last December it would be suspending all its tournaments in China due to concerns over the wellbeing of Peng Shuai, a professional tennis player who appeared to allege she had been sexually assaulted by a powerful former government official.

Former doubles world number one Peng has since denied making the accusations, yet the WTA has remained concerned for her safety and freedom.