Casper Ruud followed Rafael Nadal out of the Australian Open and admitted his decision to play through much of December rather than have an off-season may have been a mistake.

The Norwegian second seed, who reached finals at the French Open and US Open last year, had been hoping for another deep run this fortnight, only to run into an in-form Jenson Brooksby.

After a 6-3 7-5 6-7 (4-7) 6-2 defeat in three hours and 55 minutes on Rod Laver Arena, Ruud was asked about his decision to head to Latin America for a lucrative exhibition jaunt with Nadal at the end of the 2022 campaign.

He planned to take a break in February instead, but can now begin that early after going out in round two in Melbourne.

The same goes for top seed Nadal, who was already heading for defeat to Mackenzie MacDonald on Wednesday before an injury compounded his misery.

Ruud's initial reaction to being questioned about his busy December was to be defensive, saying: "It's very easy to sit here now and say that was bad for maybe both Rafa and I due to the fact that we lost early here.

"At the same time, I see no reason why we couldn't have a good Australian Open or made better results down here. I think it's coincidental sometimes."

He spoke of the talent among fellow tour players making every player vulnerable, and the "small margins" between victory and defeat.

Asked whether he had any break at all, Ruud outlined how he left for the Latin America trip on November 21 and returned in early December, before heading off on a week's holiday to the Maldives. He then stopped for a training block in Abu Dhabi on the way home and played two matches at the Mubadala exhibition event.

At the end of this season, Ruud might insist on a longer break and a focused training block.

"It was maybe not enough to be able to perform well here this year," Ruud said. "So it will be considered by me and my team what we will do in December this year, and if this was the right way to prepare for Australian Open or not.

"Maybe it looks like it was not the right way, but there are many factors that come into play. I have done what I felt was the right preparation but wasn't able to perform and win as many matches as I hoped here this year."

Casper Ruud made two grand slam finals last year, but his 2023 Australian Open campaign fell to pieces with a shock second-round loss to 22-year-old Jenson Brooksby.

American Brooksby prevailed on his fifth match point, after fluffing three in the third set, when second seed Ruud hit a return long. That sealed a 6-3 7-5 6-7 (4-7) 6-2 victory in three hours and 55 minutes on Rod Laver Arena.

Ruud's demise on Thursday means he joins top seed Rafael Nadal in exiting early in Melbourne, with the Norwegian departing in the Spaniard's wake after struggling through the first two sets before a medical time-out prior to the third.

Ruud staved off three match points at 5-3 down in the third, when Brooksby got tight with victory in sight, before winning the set in a tie-break.

However, Brooksby regained his composure in the fourth set and broke twice early to open up a 3-0 lead, barely looking back.

Brooksby's triumph is the biggest of his career, having only ever previously beaten one top-10 player, Stefanos Tsitsipas, at last year's Indian Wells. It also provides an early highlight in Brooksby's first Australian Open, having missed out in 2022 after testing positive for COVID-19 on the eve of the tournament.

"I was just really proud of my mental resolve after that third-set battle didn’t go my way," Brooksby said during an on-court post-match interview. "I thought I was playing really strong. I didn’t want to lose my focus out there."

Ruud, who was the runner-up at both the 2022 French Open and 2022 US Open, could not match Brooksby's 50 winners, while the Norwegian committed 55 unforced errors. He also failed to capitalise on Brooksby's unconvincing 57 per cent first-serve percentage.

Data Slam: Americans maintain winning form in men's singles

Brooksby's triumph sets up a third-round date with compatriot Tommy Paul as the Americans continue to make waves in the men's singles draw. It was another American, Mackenzie McDonald, who upset Nadal on Wednesday, while a flood of US stars have reached the third round.

ACES/DOUBLE FAULTS

Brooksby – 2/2
Ruud – 5/4

WINNERS/UNFORCED ERRORS

Brooksby – 50/48
Ruud – 33/55

BREAK POINTS WON

Brooksby – 9/13
Ruud – 4/12

At the Auckland Open, second-seed Briton Cameron Norrie beat American Marcos Giron 6-1 6-7 (5-7) 6-2 to set up a last-four clash with another player from the USA, Jenson Brooksby, who edged past France's Quentin Halys 7-6 (7-3) 7-6 (7-2).

The other semi-final will be an all-French battle between Richard Gasquet and Constant Lestienne, who both came from a set down to see off David Goffin and Laslo Djere respectively.

At the Auckland Open, second-seed Briton Cameron Norrie beat American Marcos Giron 6-1 6-7 (5-7) 6-2 to set up a last-four clash with another player from the USA, Jenson Brooksby, who edged past France's Quentin Halys 7-6 (7-3) 7-6 (7-2).

The other semi-final will be an all-French battle between Richard Gasquet and Constant Lestienne, who both came from a set down to see off David Goffin and Laslo Djere respectively.

At the Auckland Open, second-seed Briton Cameron Norrie beat American Marcos Giron 6-1 6-7 (5-7) 6-2 to set up a last-four clash with another player from the USA, Jenson Brooksby, who edged past France's Quentin Halys 7-6 (7-3) 7-6 (7-2).

The other semi-final will be an all-French battle between Richard Gasquet and Constant Lestienne, who both came from a set down to see off David Goffin and Laslo Djere respectively.

At the Auckland Open, second-seed Briton Cameron Norrie beat American Marcos Giron 6-1 6-7 (5-7) 6-2 to set up a last-four clash with another player from the USA, Jenson Brooksby, who edged past France's Quentin Halys 7-6 (7-3) 7-6 (7-2).

The other semi-final will be an all-French battle between Richard Gasquet and Constant Lestienne, who both came from a set down to see off David Goffin and Laslo Djere respectively.

Thanasi Kokkinakis is on a roll again at the Adelaide International 2 where the hometown hero and defending champion marched into the semi-finals on just two hours' sleep.

The Australian wildcard saw off Serbian sixth seed Miomir Kecmanovic 6-3 6-7 (4-7) 6-1 on Thursday to set up a semi-final against Spain's Roberto Bautista Agut.

Kokkinakis had a stellar run to the title at this tournament 12 months ago, beating John Isner and Marin Cilic before knocking over Frenchman Arthur Rinderknech in the final.

A first-round exit followed at the Australian Open, although he memorably won the doubles title with Nick Kyrgios. Kokkinakis struggled for the rest of the year, with his ranking currently at 110.

Kokkinakis said after his latest win: "I didn't sleep much last night. I reckon I got to sleep at about five and maybe slept for a couple of hours.

"I just couldn't sleep for whatever reason, so I was trying to conserve energy. I didn't want to use it too much. I had a couple of Monsters [energy drinks] before I started and tried to get going.

"When I'm serving well my whole game follows, and then when my forehand gets going I think I've been hitting my backhand really well this week. If I'm doing those three things, it's a good recipe.

"I grew up on this court when I was eight, nine, 10 years old. I showed up last year, and hopefully I can ride the wave with you guys and keep it going."

Fourth seed Bautista Agut beat compatriot Alejandro Davidovich Fokina 6-3 6-2, while the other Adelaide semi-final will see British player Jack Draper tackle South Korean Kwon Soon-woo.

Draper, who has been drawn to face Rafael Nadal in round one of the Australian Open, beat Russian third seed Karen Khachanov 6-4 7-6 (7-3), while Kwon saw off Swedish qualifier Mikael Ymer 6-1 6-2.

At the Auckland Open, second-seed Briton Cameron Norrie beat American Marcos Giron 6-1 6-7 (5-7) 6-2 to set up a last-four clash with another player from the USA, Jenson Brooksby, who edged past France's Quentin Halys 7-6 (7-3) 7-6 (7-2).

The other semi-final will be an all-French battle between Richard Gasquet and Constant Lestienne, who both came from a set down to see off David Goffin and Laslo Djere respectively.

Holger Rune maintained his impressive form by beating Thiago Monteiro in straight sets to reach the second round of the Stockholm Open on Monday.

Rune was beaten by Marc-Andrea Huesler in the final of the last tournament he entered in Sofia following a quarter-final appearance in Metz.

The Danish teenager, who last week announced Patrick Mouratoglou had joined his team for the rest of this season, defeated Monteiro 7-5 6-2 on his debut in the Swedish capital.

Rune did not face a break point and won 86 per cent of points on his first serve as he booked a meeting with Cristian Garin.

Garin beat qualifier Jason Kubler 6-2 6-4, while Maxime Cressy and Aslan Karatsev advanced to the last 16 at the expense of Ilya Ivashka and Lukas Rosol respectively.

Richard Gasquet consigned Stan Wawrinka to an early exit at the European Open, coming from a set down to win 2-6 7-6 (7-4) 6-4 in a battle of two of the most experienced players on the circuit.

Fifth seed Dan Evans beat Tallon Griekspoor 6-3 6-4 in the first round in Antwerp, while his fellow Brit Jack Draper was an emphatic 6-1 6-2 winner against Jenson Brooksby of the United States.

Casper Ruud stumbled to defeat against Japan's Yoshihito Nishioka as the French Open and US Open runner-up bowed out in the Korea Open quarter-finals.

World number two Ruud lost 6-2 3-6 6-2 in Seoul on Friday as the Norwegian found the going too tough in his first tournament in Asia for three years.

Ranked 56th before this week, Nishioka is one win away from vaulting back into the top 50, potentially going beyond his highest ranking of 48th if he reaches the final.

He said, quoted on the ATP website: "I feel great. My motivation is very high. I am playing very well, very smart."

Assessing top seed Ruud, Nishioka said: "I know he came from Europe and played at the Laver Cup, which is not easy matches. He wasn't settled on this court or this country yet, maybe. I was ready. I was focused on playing against him and I had a plan and it worked."

Nishioka had an outstanding run to the Washington final in August, before losing out to Nick Kyrgios in the title match. That was a major outlier in his season, which has consisted largely of early-round defeats.

His semi-final opponent will be American Aleksandar Kovacevic, a 24-year-old world number 222 who is enjoying the biggest week of his career. A 'lucky loser', handed his place in the draw when a spot opened up, Kovacevic has taken full advantage and beat compatriot Mackenzie McDonald 4-6 6-3 6-2 in their last-eight battle.

Canadian Denis Shapovalov, still seeking a first final appearance of the year, moved one step away by beating Moldova's Radu Albot 6-2 6-2, setting up a clash with American Jenson Brooksby, who was handed a bye due to Cameron Norrie pulling out with illness.

Yoshihito Nishioka knocked fifth seed Dan Evans out of the Korea Open with a straight-sets victory on Tuesday.

Nishioka moved into the second round in Seoul with a 6-2 7-6 (7-3) defeat of the Briton.

The world number 56 from Japan will face Taro Daniel or Emilio Gomez in round two after winning 70 per cent of points on his first serve and breaking Evans four times.

Jenson Brooksby was forced to go the distance, but delivered a final-set bagel as the eighth seed saw off Wu Tung-lin 7-6 (7-5) 3-6 6-0.

Qualifier Nicolas Jarry will take on top seed Casper Ruud after defeating Ryan Peniston 6-3 7-6 (10-8), while American duo Mackenzie McDonald and Steve Johnson also advanced.

Tseng Chun-hsin progressed with Chris O'Connell retired with an injury after losing the first set before Kwon Soon-woo beat Yunseong Chung in an all-South Korean contest.

Top seed Daniel Evans eased into the San Diego Open quarter-finals with a straight-sets victory over Taro Daniel on Thursday.

The Briton, who was beaten by Marin Cilic last month in the US Open third round, triumphed 6-4 6-4 in one hour and 38 minutes over Daniel.

World number 25 Evans was not broken once despite Daniel generating four break points, while the Briton only had nine unforced errors for the match, hitting 19 winners.

Evans' return was excellent throughout, while he won 64 per cent on his second serve, which held him in good stead as he looks to claim a career-first ATP title after making August's Canadian Open semi-finals.

Evans will take on Frenchman Constant Lestienne who made light work of Chilean Alejandro Tabilo 6-1 6-3, converting five of eight break points.

Fifth seed Brandon Nakashima triumphed in the late game, getting past fellow American Denis Kudla 6-3 6-4 in one hour and 16 minutes, in a fine display that included 12 aces, 25 winners and only five unforced errors.

Fourth seed Pedro Martinez was the major casualty of the day, letting slip an early lead to lose 5-7 6-1 6-4 to Colombian Daniel Elahi Galan in almost three hours. Galan hit 44 winners compared to Martinez's 28, while he also generated 18 break points.

Eighth seed J.J. Wolf was also bundled out, losing 6-3 7-5 to Australian Christopher O'Connell who sent down 12 aces and hit 23 winners.

Second seed and world number 50 Jenson Brooksby needed almost two hours to get past countryman Mackenzie McDonald 6-4 3-6 6-2.

Finland's Emil Ruusuvuori collected a big-name scalp on the opening day of the Canadian Open, defeating three-time grand slam winner Stan Wawrinka 6-3 3-6 6-3 on Monday.

Although the 37-year-old Wawrinka is no longer at his best – ranked 322nd in the world – he still put up a strong fight against his 23-year-old opponent, creating eight break point opportunities in the match while facing nine.

Ruusuvuori will play eighth seed Hubert Hurkacz in the second round in a tough matchup, while Slovakia's Alex Molcan will play fourth seed Casper Ruud after defeating American Mackenzie McDonald 7-6 (7-1) 6-4.

Molcan's advantage was in his serve, winning 74 per cent (49-of-66) of his service points compared to 59 per cent (49-of-83) for McDonald.

In a clash between a pair of top-30 talents, Russia's Karen Khachanov got the better of Argentina's Francisco Cerundolo 7-6 (7-4) 5-7 6-3. He will play the winner between 13th seed Marin Cilic and Croatia's Borna Coric next.

Recent runner-up of the Atlanta Open Jenson Brooskby had no issues with Kazakhstan's Alexander Bublik, winning 6-2 6-3, and he will likely play Roberto Bautista-Agut in the second round as the Spaniard leads 7-6 (7-5) 2-1 with a break in the second set when a rain delay ended the day's play.

One of Canada's top hopes, Denis Shapovalov, will have his back up against the wall when his match resumes against Alex de Minaur, losing the first set 7-5, with the rain arriving in the middle of the second-set tiebreaker.

Jack Draper will head back onto the court with a set advantage against Hugo Gaston after winning the opener 6-2, although he will have to save a break point first up.

Nick Kyrgios barely broke a sweat on his way to a 6-3 6-2 win against Marcos Giron in the opening round of the Washington Open, finishing the job in an even 60 minutes.

The talented Australian, who won the doubles title at last week's Atlanta Open with compatriot Thanasi Kokkinakis, showed off his imposing serve against Giron. He won the ace count 12-to-four, while converting 82 per cent (28-of-34) of his successful first serves into points.

Earlier in the day, Daniel Evans won an all-English showdown against Kyle Edmund 6-1 6-2, but fellow Englishman Jack Draper was not so lucky against Russia's Andrey Rublev, going down 6-4 6-2.

Winner of the singles title at the Atlanta Open, Jenson Brooksby could not keep his strong form going as he lost 6-4 6-3 to Yoshihito Nishioka. Mackenzie McDonald lost to Brooksby in Atlanta, and he was also bounced in the first round by Finland's Emil Ruusuvuori 1-6 6-4 6-4.

America's Chris Eubanks won a tough three-setter against France's Benjamin Bonzi 3-6 6-3 7-5, and Sebastian Korda passed the test of in-form Ilya Ivashka 6-4 7-6 (7-5).

Veteran Jack Sock got the better of Belgium's David Goffin 7-6 (7-4) 6-4, and the Netherlands' Botic van de Zandschulp fought off frisky Croatian Borna Gojo 7-6 (8-6) 6-7 (5-7) 6-4 to narrowly avoid an upset from a player ranked 170 spots lower.

Meanwhile, at the Los Cabos open in Mexico, Kokkinakis continued his march back up the rankings with a 6-3 6-7 (5-7) 6-2 win against Fernando Verdasco.

Kokkinakis will play American Steve Johnson in the second round after he collected a straight sets 7-6 (7-1) 6-4 win against Argentina's Gonzalo Villanueva.

Romania's Radu Albot defeated Spain's Feliciano Lopez 6-3 6-7 (6-8) 6-3 to book his place in the second round against Australian Jason Kubler, who won his 10th match from his past 12 fixtures to beat Tomas Martin Etcheverry 6-7 (4-7) 6-3 6-1.

The only Mexican in the draw, Alex Hernandez, made the most his wildcard to win his first tour-level match, defeating Nicolas Barrientos 3-6 6-4 6-4 to become the first Mexican player to win at Los Cabos.

Facundo Bagnis was the only of the three Argentines to make it through, with a 6-3 6-1 win over Ernesto Escobado, Brandon Nakashima defeated Kaichi Uchida 7-6 (7-1) 6-2, and Jordan Thompson rounded out the day's action with a comfortable 6-3 6-0 triumph over Yannick Hanfmann.

Australia's Alex de Minaur defeated hometown hero Jenson Brooksby in the final of the Atlanta Open on Sunday, winning in straight sets 6-3 6-3.

It is the second time De Minaur has won the Atlanta Open – also getting the job done in 2019 when he met American Taylor Fritz in the final.

This time around, De Minaur feasted on Brooksby's second serve, winning 81 per cent (13-of-16) of those opportunities, compared to just 29 per cent when the American was able to land his first serve.

It was even more pronounced in the second set as the fast-finishing De Minaur continued to strangle the life out of Brooksby, as he was only able to win the point twice from 12 second serves.

Despite his relatively comfortable victory, it was De Minaur who had to face adversity first as he so often does before fighting back, facing the first two break points of the game, but he saved both before capitalising on his only break point opportunity in the opening set.

The Aussie threatened to run away with the match when he broke again in the opening game of the second frame, but Brooksby instantly snatched back a break of his own.

Ultimately, De Minaur was just better both on serve and in his return game, winning 59 per cent of his points on serve compared to 52 per cent for Brooksby.

He also saved four of Brooksby's five break point opportunities, while winning all four of his own.

It is the sixth ATP Tour title of De Minaur's career, and his first since the Eastbourne International in June 2021.

Alex de Minaur booked his place in the Atlanta Open final with a come-from-behind 5-7 6-2 6-2 win against Ilya Ivashka on Saturday.

It was a tight first set, which was interrupted at 5-5 by a three-hour rain delay. Upon returning, Ivashka broke instantly and served out the set – but it would be his last break of serve.

De Minaur had to save two break points to hold in the opening game of the second set, but from that point on he took over, collecting two breaks in the frame.

The Australian, who is the tournament's third seed and ranked 30th in the world, controlled the decider, winning 69 per cent of his points on serve compared to 50 per cent for Ivashka as he figured out the Belarusian's serve, allowing no aces down the stretch.

He will meet Jenson Brooksby in the final after the American put on an impressive showing against compatriot Frances Tiafoe, winning 6-1 6-4.

Brooksby has been in great touch this tournament, running over Mackenzie McDonald in the quarter-final in what was meant to be a competitive matchup, and then upsetting second seed John Isner in the semi-final, breaking his incredibly tough serve three times.

Against Tiafoe, the story was about how dominant Brooksby was early on when he got the chance to see a second serve, winning 87 per cent (11-of-14) of the points off Tiafoe's second serve in the opening set.

Tiafoe never really got a chance to fight back in the second frame, getting broken in the opening game, and from there Brooksby closed the door, not allowing a single break point opportunity.

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.

Wimbledon runner-up Nick Kyrgios was a late withdrawal from the Atlanta Open, after he was originally scheduled to play Peter Gojowczyk on Tuesday.

Kyrgios' replacement in Adrian Mannarino eventually defeated Gojowczyk 6-3 7-6 (9-7), but the Wimbledon finalist's withdrawal due to injury overshadowed the match.

After receiving a wild card for the Cincinnati Masters, the 2016 champion in Atlanta was expected to make a deep run to kick off his hard-court season.

Coming out to apologise to the crowd before Gojowczyk and Mannarino took to the court, Kyrgios expressed his sadness at the withdrawal, in the hope he could still play in the doubles draw with fellow Australian Thanasi Kokkinakis.

"I'm extremely shattered that I'm not able to compete tonight," he said pre-match. "I've won this tournament once, and you know, I'm playing some of the best tennis of my career.

"All I wanted to do was come out here and give you guys a show, to see what I was capable of. I'm unable to give out my best performance today, and I'm just extremely sorry.

"I'm going to keep my hopes up and maybe be able to continue doubles with Thanasi this week. I hope you'll all not be too hard on me."

Kokkinakis just has the doubles to attend to now after Andres Martin's 6-3 6-2 win, while Ilya Ivashka progressed with a 6-0 3-6 6-3 win over Quentin Halys.

James Duckworth was the lone Australian to advance on Tuesday, beating Dominik Koepfer 6-1 6-7 (5-7) 6-3. 

Jenson Brooksby made an encouraging Atlanta Open debut earlier in the day, eliminating Benoit Paire 6-3 6-1 to reach the second round.

Countryman and fifth seed Tommy Paul breezed past wild card Jack Sock 6-1 6-1, while Ben Shelton and Mackenzie McDonald also advanced.

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."

Emerging Spanish star Carlos Alcaraz continued his rise with a 7-5 6-3 upset of third seed Stefanos Tsitsipas to reach the Miami Masters quarter-finals on Tuesday.

The 18-year-old, who reached last year's US Open final eight after beating Tsitsipas in the third round, proved too good again for the Greek in one hour and 50 minutes.

Alcaraz reached last week's Indian Wells semi-finals and is now 15-2 on the season, with the win setting up a clash with Serbian Miomir Kecmanovic who upset last week's Indian Wells champion Taylor Fritz 3-6 6-1 6-4.

Tsitsipas broke the Spaniard in the sixth game and led 5-2 before Alcaraz reeled off seven straight games to sensationally take the first set.

Alcaraz surged ahead in the second set, with his defence and speed leaving Tsitsipas short on answers.

The Spaniard, who saved seven of eight break points throughout the match, converted his fourth match point for victory.

"It was really, really tough. He was playing unbelievable," Alcaraz said after the match. "All I can say is I fought until the last ball in the first set [to] come back."

Ninth seed Jannik Sinner won 7-6 (7-3) 6-3 over enigmatic Australian Nick Kyrgios, who had a furious outburst directed at umpire Carlos Bernardes.

The Australian was heard to label Bernardes "an absolute clown" and continued to berate the umpire late in the first set, leading to a code violation and two penalties.

Kyrgios completely lost his cool, demanding to speak to a tournament official before smashing his racquet early in the second set, leading to a game penalty as well.

Sinner will next take on Argentine Francisco Cerundolo after he defeated 28th seed Francis Tiafoe lost 6-7 (2-7) 7-6 (7-3) 6-2.

Top seed Daniil Medvedev made light work of Jenson Brooksby 7-5 6-1 to set up a quarter-final showdown with reigning champion Hubert Hurkacz who won 7-6 (7-3) 6-2 over Lloyd Harris. Medvedev will return to the top of the ATP rankings if he wins their quarter-final.

Second seed Alexander Zverev got past Thanasi Kokkinakis 6-4 6-4 and will meet sixth seed Casper Ruud in the last eight, after the Norwegian won 6-3 6-4 over Briton Cameron Norrie.