Dominic Thiem survived another test to reach the Rio Open quarter-finals, while Milos Raonic's run at Delray Beach continued on Thursday.

Thiem, playing his first tournament since reaching the Australian Open final, was pushed by Jaume Munar before winning 6-7 (5-7) 6-3 6-4 on the clay in Brazil.

The Austrian top seed, who won the ATP 500 event in 2017, needed two hours, 41 minutes to advance, having also dropped a set in his opener.

Thiem will face Gianluca Mager in the quarter-finals after the Italian qualifier's 6-3 7-6 (7-5) victory over Joao Domingues.

Borna Coric moved into the last eight courtesy of a 6-3 1-6 7-6 (7-5) win against wildcard Thiago Seyboth Wild.

The fifth seed will meet Lorenzo Sonego, who upset second seed Dusan Lajovic 7-6 (7-5) 7-6 (7-5).

At the Delray Beach Open, Raonic – the 2017 runner-up – served 11 aces in a 7-5 6-3 win over Cedrik-Marcel Stebe that sent him into the quarter-finals.

Steve Johnson awaits the Canadian after overcoming 2017 champion Jack Sock 6-4 5-7 6-1.

Frances Tiafoe, the 2018 winner, and Ugo Humbert set up a last-eight meeting with straight-sets victories over Tommy Paul and Miomir Kecmanovic respectively.

Open 13 Marseille top seed Daniil Medvedev got his tournament off to a fine start as he came from behind to defeat NextGen champion Jannik Sinner.

The 18-year-old Sinner claimed the first top-10 scalp of his career when he beat David Goffin last week, but he did not have enough to hold on against Medvedev.

After world number five Medvedev was brushed aside in a 25-minute first set, the Russian claimed two vital breaks in the second set before taking the decider for a 1-6 6-1 6-2 victory.

Medvedev will next take on Gilles Simon - a Marseille champion in 2007 and 2015 - after the Frenchman overcame Aljaz Bedene 7-6 (8-6) 6-4 to reach the quarter-finals.

Meanwhile, Goffin suffered another upset, going down 6-4 7-6 (7-5) to Belarusian qualifier Egor Gerasimov.

Gerasimov's next opponent, Felix Auger-Aliassime, overcame Pierre-Hugues Herbert in a thrilling encounter, with the youngster coming out on top 6-0 6-7 (6-8) 7-6 (11-9).

Auger-Aliassime's Canadian compatriot Denis Shapovalov also made the last eight as 17 aces helped him defeat two-time finalist Marin Cilic 6-4 4-6 6-2, with the world number 15 to meet Alexander Bublik next.

Roger Federer will miss the French Open after undergoing knee surgery on Wednesday, the 20-time grand slam champion has confirmed.

The 20-time grand slam champion was due to play in his second tournament of the year at the Dubai Tennis Championships next week after losing to Novak Djokovic in the semi-finals of the Australian Open last month.

Federer, 38, revealed on Thursday that he has been troubled by an issue with his right knee and underwent an arthroscopic operation in his native Switzerland, which should enable him to make a full recovery.

The world number three will sit out the second major of the year at Roland Garros in May, but expects to be back for the grass-court season.

Federer posted on Twitter: "My right knee has been bothering me for a little while.

"I hoped it would go away, but after an examination, and discussion with my team, I decided to have arthroscopic surgery in Switzerland yesterday.

"After the procedure, the doctors confirmed that it was the right thing to have done and are very confident of a full recovery.

"As a result, I will unfortunately have to miss Dubai, Indian Wells, Bogota, Miami and the French Open. I am grateful for everyone's support.

"I can't wait to be back playing again soon, see you on the grass!"

American teenager Brandon Nakashima reached the Delray Beach Open quarter-finals, while Cristian Garin moved through to the last eight of the Rio Open.

Competing in his debut ATP Tour tournament, 18-year-old wildcard Nakashima defeated British qualifier Cameron Norrie 7-5 6-2 on Wednesday.

Nakashima, who is coached by 1987 Wimbledon champion and two-time Australian Open runner-up Pat Cash, is the event's youngest quarter-finalist since Kei Nishikori won the tournament as an 18-year-old in 2008.

"I always knew that I had the game to compete with these high-level pros. I just had to have the right opportunities," said Nakashima, who will face Yoshihito Nishioka after the Japanese blitzed Noah Rubin 6-1 6-2.

"I was just hoping to play a good first-round match here, but after winning these two matches, I have a lot of confidence in my game now… Hopefully I can keep it going."

Reilly Opelka – the fourth seed – dismantled Mackenzie McDonald 6-3 6-4 and Kwon Soon-woo prevailed 6-4 3-6 7-6 (7-0) against Ryan Harrison.

At the Rio Open, third seed Garin beat Federico Delbonis 6-4 6-3 en route to the quarters in Brazil.

Garin, who claimed the Cordoba Open title almost a fortnight ago, hit 22 winners to earn a meeting with Federico Coria after the Argentinian's 6-4 4-6 6-4 victory over Carlos Alcaraz.

Elsewhere, lucky loser Attila Balazs rallied past Thiago Monteiro 1-6 6-1 6-4 and Pedro Martinez trumped fellow Spaniard Pablo Andujar 6-1 6-4.

Stefanos Tsitsipas started the defence of his Open 13 Marseille title with a straight-sets victory over Mikael Ymer to reach the quarter-finals.

Tsitsipas has made a disappointing start to the season, but took just 71 minutes to dispatch Ymer 6-1 6-3 on Wednesday.

The ATP Finals champion lost just three points on his first serve and did not face a solitary break point in an emphatic win.

Second seed Tsitsipas will face Vasek Pospisil in the last eight following the Canadian's 6-3 6-4 defeat of eighth seed Hubert Hurkacz.

Sixth seed Benoit Paire made a surprise exit in his homeland, going down 3-6 6-4 6-4 to Alexander Bublik in the second round.

It was anything but plain sailing for Felix Auger-Aliassime, who saved two match points before getting past Stefano Travaglia 6-7 (3-7) 7-6 (8-6) 6-3.

Auger-Aliassime's second-round opponent will be Pierre-Hugues Herbert, a 7-6 (7-4) 6-4 victor in his match against Mikhail Kukushkin. 

Egor Gerasimov also reached round two by knocking out fellow qualifier Dennis Novak.

Dominic Thiem resumed his season with a first-round win at the Rio Open, while Jack Sock finally ended his wait for another victory.

Thiem, last in action in an Australian Open final loss to Novak Djokovic, returned with a 6-2 4-6 6-1 victory over wildcard Felipe Meligeni Alves on Tuesday.

The 2017 champion of the ATP 500 event played on clay in Brazil, top seed Thiem grabbed two breaks of serve in the deciding set.

Having started 2020 with four losses in five matches, Borna Coric found a victory by overcoming Juan Ignacio Londero 7-6 (7-5) 7-5.

Dusan Lajovic joined Thiem and Coric as the three seeds to win, but two fell in the opening round.

Casper Ruud, coming off a title win at the Argentina Open, went down to qualifier Gianluca Mager 7-6 (7-4) 7-5.

Guido Pella, the 2016 runner-up, was edged by Thiago Monteiro 5-7 6-4 7-6 (7-3) after just over three hours.

At the Delray Beach Open, Sock claimed his first non-Laver Cup singles win since late 2018.

The American 2017 champion, a wildcard, battled past last year's winner Radu Albot 3-6 6-3 7-6 (7-2), saving a match point in the final set and breaking down in tears following his victory.

Canadian second seed Milos Raonic brushed past lucky loser Denis Istomin 6-2 6-2 and Reilly Opelka served 20 aces in a 6-7 (5-7) 6-4 7-6 (7-4) victory over Ernests Gulbis.

Ugo Humbert, the French sixth seed, battled through, while third seed Taylor Fritz fell to qualifier Cameron Norrie 6-4 6-7 (4-7) 6-4.

Jannik Sinner set up an enticing second-round clash against top seed Daniil Medvedev at the Open 13 Marseille with a 6-4 7-6 (7-5) win over Norbert Gombos.

The 18-year-old is viewed as one of the most exciting prospects on the ATP Tour and a run to the quarter-finals in Rotterdam that saw him defeat David Goffin will have only furthered his burgeoning reputation.

Sinner will now get to test himself against US Open finalist Medvedev after defeating Gombos in straight sets on Tuesday.

Sinner saved all of the six break points he faced and was aided by nine aces, with a significant stoppage because of an alarm disrupting play at the Palais des Sports de Marseille not affecting his rhythm.

On his upcoming match with Medvedev, Sinner said in his on-court interview: "Nothing to lose, I will try to play my best tennis, which I have to do if I want to win. If not it will be a very nice experience."

Vasek Pospisil, who stunned Medvedev in the first round in Rotterdam, saw off lucky loser Emil Ruusuvuori 7-6 (8-6) 6-3. Hubert Hurkacz awaits Pospisil in the second round after the eighth seed's 6-4 6-1 victory over Antoine Hoang.

Marin Cilic came from a set and a break behind to beat qualifier Ilya Ivashka 3-6 7-6 (7-5) 6-4 and book a second-round meeting with Denis Shapovalov.

Gilles Simon had no such issues against Harold Mayot 6-4 7-6 (7-3) and will meet Aljaz Bedene next after his surprise 4-6 6-4 7-5 win over fifth seed Khachanov.

Novak Djokovic says winning trophies is not his main motivation as he sets out to have a career-best season in 2020.

Djokovic got the year off to a flying start, defeating Dominic Thiem to retain his Australian Open title and reclaiming the world number one spot from Rafael Nadal in the process.

The 17-time grand slam champion has now outlined his intention to have the best season of his career in 2020, as he aims to go all the way to gold at the Tokyo Olympics.

However, Djokovic insisted it is his love of tennis that inspires him, rather than the pursuit of trophies.

"For me, while everyone talks about trophies, that creates a lot of tension," Djokovic said at a news conference in Belgrade.

"I have my goals of course, trophies can make me proud and happy in the moment, but they can't fulfil me in life.

"My main inspiration is the joy I feel while I am holding a racquet. If that wasn't the case, I wouldn't be here. If I don't nurture that initial love then I can't be fulfilled. 

"I am motivated and inspired to have my best season this year. It is an Olympic year, which means that the schedule will be busy, not just for me, but for all the top players.

"There will be little room for rest after Wimbledon. I had the honour of winning a bronze medal in 2008 and somehow feel that maybe the time has come for another medal, I hope. I will do everything in my power to reach the peak at the Olympics."

Despite his success, Djokovic has never been able to capture the adoration of tennis crowds in the same way that Rodger Federer and Nadal have, yet the 32-year-old does not believe he is disliked.

"A lot has been written about how I am not loved. I don't like to talk about myself, but my personal impression is that I have a lot of support and sympathy for me," he said.

"When I play Federer or Nadal, the crowd supports them but that doesn't mean I am hated and that I should turn the whole of the Serbian public against the world.

"Even if people don't love me everywhere, why would I want to add fuel to the fire? I don't want to put too much attention on it, I don't want to deal with or think about negative emotions, hatred or anger. Sometimes I get distracted, I have outbursts.

"I admit that and I am not proud of it but I am a human being that makes mistakes and I try to become better every day.

"If I invest my energy in these stories that I am not loved, that story will keep growing and why would I want that?"

Fernando Verdasco slumped to another first-round loss, while Cristian Garin battled through at the Rio Open on Monday.

Verdasco, the ninth seed at the ATP 500 tournament, was beaten 6-3 6-3 by fellow Spaniard Pablo Andujar on the clay in Brazil.

The 36-year-old has fallen to three straight losses, the first of which was a third-round defeat at the Australian Open.

Verdasco – the 2018 runner-up – was one of three seeds tested, but Garin survived a test against Andrej Martin.

Garin, who won the title in Cordoba earlier this month, needed more than three hours to edge Martin 4-6 7-5 7-6 (7-5).

Albert Ramos-Vinolas departed, the seventh seed falling to 16-year-old Carlos Alcaraz 7-6 (7-2) 4-6 7-6 (7-2) after three hours, 36 minutes.

Federico Delbonis advanced, while wildcard Thiago Seyboth Wild needed almost four hours to get past Alejandro Davidovich Fokina 5-7 7-6 (7-3) 7-5.

There were also upsets at the Delray Beach Open, where John Millman and Adrian Mannarino were beaten in the first round.

Millman, the fifth seed, went down to Yoshihito Nishioka 3-6 6-4 6-2 and seventh seed Mannarino fell to Kwon Soon-woo 1-6 6-3 6-2.

Frances Tiafoe, the champion in 2018, came through his opener against qualifier Emilio Gomez.

Sixth seed Benoit Paire secured safe passage through to the last 16 of the Open 13 Marseille in one of three main-draw matches on Monday.

Paire was drawn against compatriot Gregoire Barrere in a battle of two home hopefuls, but the more established player triumphed in straight sets.

The 20th-ranked star broke in the third game of the opener and protected his advantage in straightforward fashion.

There were no breaks in the second, but Paire dominated the tie-break to claim a 6-4 7-6 (7-1) victory.

Barrere was not the only Frenchman to exit the competition, as former world number seven Richard Gasquet went down 6-3 3-6 7-5 to Mikael Ymer.

Ymer will now meet Stefanos Tsitsipas, the defending champion and number two seed, who was granted a first-round bye.

In the final match of the day, Alexander Bublik defeated Marton Fucsovics 6-4 7-5.

Dominic Thiem says returning to the clay courts is "like coming home" as he prepares for a first match since his dramatic Australian Open final defeat to Novak Djokovic.

The Austrian was one set away from winning his first grand slam title in Melbourne, only for Djokovic to edge a thrilling encounter 6-4 4-6 2-6 6-3 6-4.

After two weeks to recover from what Thiem acknowledged was a tough defeat to take, the world number four is reflecting positively and looking forward to playing again as top seed at the Rio Open.

Thiem starts his campaign against home hope Felipe Meligeni Alves on Tuesday and is the only top-20 player taking part in the ATP 500 event.

"Coming on clay is like coming home," Thiem, a 2017 winner in Rio, said to the ATP Tour. "I like the surface and also really like South America. It's a completely different atmosphere.

"I've had great experiences, won here, won Buenos Aires twice, so it's very easy for me to come back here."

Of his Australian Open exploits, Thiem added: "I feel great about the performance in Melbourne. It was a hell of a two weeks, beating three top-10 guys and then losing to Novak Djokovic 6-4 in the fifth.

"Of course, it was a huge disappointment. But after some time to reflect, it was a great tournament and start to the season. I hope to keep that good form going." 

At a period of the season where hard-court tournaments return to the schedule in Indian Wells and Miami next month, Thiem is not worried about his momentum being disrupted.

He said: "For me, it's no problem to play on clay for one or two weeks and then switch back to hard courts."

Kyle Edmund defeated Andreas Seppi in straight sets to capture the New York Open title on Sunday.

Briton Edmund – contesting his first ATP Tour final since 2018 – claimed a 7-5 6-1 victory in New York.

The eighth-seeded Edmund prevailed over Italian opponent Seppi after one hour, 21 minutes for his second ATP crown.

Edmund, who reached the 2018 Australian Open semi-finals, used his serve to see off Seppi on the American hard courts at the 250 tournament.

The South Africa-born Edmund won 31 of his 33 first serve points and did not face a break point throughout the match.

Edmund broke three times en route to his first trophy since winning the 2018 European Open in Belgium.

Casper Ruud became the first Norwegian to claim an ATP Tour title after winning the Argentina Open.

Ruud made history with a comprehensive 6-1 6-4 victory over Portugal's Pedro Sousa in Sunday's final in Buenos Aires.

The 21-year-old also became the youngest Argentina Open champion – surpassing 2004 winner Guillermo Coria (22).

Ruud's win means he will become Norway's highest ranked male player ever – projected to climb to 34th – taking the record from his dad Christian, who reached 39th in the world in 1995.

Playing on red clay at the ATP 250 tournament, Ruud was a class above as he won all nine of his services games without facing a break point.

Ruud also broke three times in the one hour, 11-minute contest, including the first return game of the match to set the tone.

Sousa hit back-to-back double faults in the opening game of the second set to gift Ruud the break, and the eighth seed never looked back en route to a maiden crown.

Gael Monfils followed up last week's third Open Sud de France title by defending his Rotterdam Open crown, dealing teenager Felix Auger-Aliassime further ATP Tour final agony.

In-form world number nine Monfils triumphed at the Montpellier championship the previous Sunday and made it nine straight Tour wins with a 6-2 6-4 success this time.

Canada's Auger-Aliassime, on the other hand, is still waiting for his first senior career title and was never really in the contest as Monfils ended the week without dropping a set.

Playing his fourth Tour final after a trio of 2019 defeats, the 19-year-old made a nervous start and was required to rescue three break points in just the third game after some wayward initial work with the forehand.

Auger-Aliassime merely delayed the setback until his next service game, though, Monfils coming out on top for a 3-2 lead as the pair did battle at the net.

Following a brief Monfils scare, Auger-Aliassime went long when defending a third break opportunity next time out and slipped further behind, allowing the third seed to serve out the opener.

There was no improvement from the Canadian when the match resumed, the second set beginning with a series of errors and a crushing break to love.

Monfils stylishly got the better of an apparently defeated Auger-Aliassime at the net to tee up another three openings, taking the last of them.

The Frenchman stuttered badly when serving for the championship and lost one of his breaks as Auger-Aliassime belatedly rallied, but the victory was eventually sealed.

Kyle Edmund and Andreas Seppi will meet in the New York Open final after comfortable wins on Saturday.

Edmund reached his third ATP Tour decider and first since 2018 with a 6-1 6-4 thrashing of Miomir Kecmanovic in their semi-final.

The British eighth seed needed just 71 minutes to brush past Kecmanovic, converting three of seven break points.

Awaiting Edmund in the final of the ATP 250 tournament is Seppi after the Italian veteran beat qualifier Jason Jung 6-3 6-2.

Seppi, 35, is a three-time title winner on the ATP Tour, although the last of those came in 2012.

At the Argentina Open, Norwegian eighth seed Casper Ruud overcame Juan Ignacio Londero 4-6 7-5 6-1 in their semi-final.

Ruud's win means he will become Norway's highest ranked male player ever, taking the record from his dad Christian, who reached 39th in the world in 1995.

Into his second ATP final, Ruud will face Pedro Sousa after the lucky loser's run continued.

Sousa moved through after Diego Schwartzman withdrew from their semi-final due to a leg injury.

The Argentinian had struggled late in his win over Pablo Cuevas on Friday, when he needed three hours, 41 minutes to advance.

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