Daniil Medvedev's run of poor results continued at the Open 13 Marseille as he suffered a heavy straight-sets defeat to Gilles Simon.

Top seed Medvedev looked to have put his shock loss to Vasek Pospisil in Rotterdam behind him when he beat teenager Jannik Sinner in three sets to reach the last eight in the south of France.

However, he lasted just 67 minutes on court as Simon won their quarter-final in a 6-4 6-0 rout, racking up his 29th victory in Marseille, the most he has claimed at any ATP Tour event.

Simon's win sets up a semi-final with Rotterdam finalist Felix Auger-Aliassime, the 19-year-old defeating Egor Gerasimov 7-5 6-2.

Pospisil was unable to earn a second shock victory in as many weeks, losing to world number six Stefanos Tsitsipas 7-5 6-3.

Auger-Aliassime will be the sole Canadian in the last four, with Denis Shapovalov joining Pospisil exiting at the quarter-final stage.

Fourth seed Shapovalov won the second set against Alexander Bublik, but was unable to complete a comeback after losing the first and was eventually defeated 7-5 4-6 6-3.

Kevin Anderson is set to miss the first two ATP Masters events of the season after he underwent surgery on a knee injury.

Former world number five Anderson – a US Open and Wimbledon finalist in 2017 and 2018 respectively – confirmed the news on his official Twitter account on Friday.

The 33-year-old, now ranked at 121, slumped out in the second round of the Australian Open in January before succumbing to Jason Jung in the round of 32 at the New York Open this month.

Anderson will now miss the Mexico Open, where he is a two-time finalist, along with the Masters events at Indian Wells and Miami and seems set to face a race against time to be fit for the French Open in May.

He has confirmed the injury to his right knee was sustained during off-season training in December, with scans in Australia confirming a medial meniscus tear.

"It is beyond difficult and frustrating to have to deal with this, after the setbacks I had last year," Anderson posted on Twitter. "But I know it's the right decision for me to get back where I want to, and rest assured I will do everything in my power to get there."

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.

Simona Halep survived a scare against Aryna Sabalenka as she fought back from a set down to progress into the Dubai Tennis Championships semi-finals.

Halep, appearing for the first time since a run to the last four at the Australian Open, lost to Sabalenka in their most recent meeting - in Adelaide in January - but had won her prior two encounters with the world number 13.

Despite trailing in the first set, the world number two rallied in the second thanks to three breaks of serve, before cruising in the decider to wrap up a 3-6 6-2 6-2 win over her Belarusian opponent.

The Romanian, a Dubai champion in 2015, will now go up against Jennifer Brady, whose run of upsets continued as she overcame Australian Open finalist Garbine Muguruza to claim her third straight top-20 triumph.

Having already knocked out third seed Elina Svitolina and Marketa Vondrousova in previous rounds, Brady moved into the semis with a 6-7 (5-7) 6-3 6-4 win.

It is the first time in Brady's career that the American has made it into the last four of a WTA Premier event, though she was not fully satisfied with her performance.

"I wasn't feeling my best," she said in quotes reported by the WTA's official website. "Maybe I didn't play my best tennis, but I just found a way to stay in there, compete and come out on top."

The other semi-final will see Elena Rybakina, whose fine run continued with a win over Karolina Pliskova, meet Petra Martic.

Dubai debutant Rybakina has started 2020 in fine form and dispatched world number three Pliskova on Thursday, completing a 7-6 (7-1) 6-3 success in one hour and 41 minutes.

It means Rybakina has made her fourth semi-final in five tournaments so far this year, with a tie against Martic - who beat Anett Kontaveit 7-6 (7-4) 6-1 - her reward.

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.

Top seed Simona Halep saved a match point in a gripping battle with Ons Jabeur before sealing her place in the quarter-finals of the Dubai Tennis Championships.

Halep was on the brink of a surprise defeat to the in-form world number 45, but hung in there to win a thriller 1-6 6-2 7-6 (9-7) on Wednesday.

The two-time grand slam champion and Jabeur were given great backing from passionate Romanian and Tunisian supporters in a pulsating contest that swung one way and the other.

Halep appeared destined to complete the turnaround with ease when she led 3-0 in the final set, but the tenacious Jabeur was relishing the battle and showed great spirit to take the upper hand at 6-5.

The unseeded Jabeur was broken to love when serving for the match, though, and a double-fault gifted 2015 champion Halep a 4-2 lead in the tie-break, yet there was more drama to come.

Jabeur fended off three match points to earn one of her own, but Halep showed her grit to win the next two points before her gutsy opponent drilled a forehand long to end a tense two-hour contest.

Halep will face Aryna Sabalenka in the last eight after the seventh seed defeated Elise Mertens 6-4 6-3.

Australian Open runner-up Garbine Muguruza advanced with a hard-fought Veronika Kudermetova, winning 7-5 4-6 6-4 two days after knocking out the returning Kim Clijsters.

Elena Rybakina, a three-time finalist this year, got the better of Katerina Siniakova for the second successive week, a 6-3, 6-3 victory setting up a meeting with Karolina Pliskova.

Second seed Pliskova lost just three games in emphatic defeat of Kristina Mladenovic, while Petra Martic, Jennifer Brady and Anett Kontaveit were also victorious.

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.

Sofia Kenin lost her first WTA Tour match since winning the Australian Open triumph to crash out of the Dubai Tennis Championships in the first round.

Kenin claimed her maiden grand slam title in Melbourne and then helped the United States to a place in the Fed Cup Finals with a 3-2 win over Latvia.

However, despite winning a tight opening set on Tuesday, she was defeated 6-7 (2-7) 6-3 6-3 by St Petersburg Ladies Trophy runner-up Elena Rybakina, whose reward is a second-round tie against Katerina Siniakova, who overcame Karolina Muchova 6-4 4-6 6-0.

"I didn't get nervous at all because I knew it was going to be tough," Rybakina, who was playing her sixth match in eight days, said.

"Actually, I prepared myself like it's a good practice. I didn't expect to win. I tried to do my best, but I was not nervous. I didn't think about her winning the Australian Open because I know that now anyone can beat anyone."

Kenin's defeat was not the only shock, however, with Belinda Bencic's defence of her title proving to be short-lived as she let a brilliant start slip in a remarkable loss to Anastasia Pavlyuchenkova.

World number four Bencic was in complete control as she took the first 19 points but was unable to prevent Pavlyuchenkova building momentum in an extraordinary turnaround.

After losing seven of the first eight games, the Russian won 12 of the final 13 to cap a brilliant 1-6 6-1 6-1 triumph – her 15th win against top-five opposition and her second of 2020.

Bencic's capitulation followed on from another surprise result, with Jennifer Brady claiming a 6-2 6-1 victory over Elina Svitolina.

Brady – who stunned world number one Ash Barty in Brisbane last month – needed just an hour to send the world number six, who won in Dubai in 2017 and 2018, packing.

Kristina Mladenovic cruised past Aliaksandra Sasnovich in straight sets to tee up a tie with second seed Karolina Pliskova.

Veronika Kudermetova got the better of Dayana Yastremska, while Petra Martic dispatched Hsieh Su-wei and Aryna Sabalenka saw off Maria Sakkari 6-2 4-6 6-1.

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?"

China have pulled out of this year's Davis Cup due to travel restrictions imposed amid the spread of the coronavirus.

The Chinese team had been due to face Romania in a World Group I play-off on March 6-7, but they have forfeited the match.

Their withdrawal was announced by the International Tennis Federation (ITF) on Tuesday. The city of Piatra Neamt, in northern Romania, had been due to stage the fixture.

The ITF announced on Twitter: "The Davis Cup committee has accepted the withdrawal of China, PR from their Davis Cup World Group I play-off against Romania on 6-7 March.

"The increased restrictions in response to the current coronavirus outbreak have resulted in the China, PR team being unable to travel to this tie. Romania will advance to play in World Group I in September."

The coronavirus - officially named Covid-19 - has caused a host of sporting events in China and Asia to be postponed or cancelled.

Those affected have included Formula One's Chinese Grand Prix, the athletics World Indoor Championship, snooker's China Open and several golf tournaments.

China has seen over 70,000 confirmed cases during its outbreak, with the death toll rising above 1,800 victims.

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.

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