Frances Tiafoe has withdrawn from the All-American Team Cup exhibition event in Atlanta after testing positive for coronavirus.

Tiafoe announced he had contracted COVID-19 on Saturday, having played in Friday's opening session, beating Sam Querrey in straight sets.

The 22-year-old American and world number 81 has been replaced by Christopher Eubanks.

"Unfortunately, I tested positive late Friday for Covid-19 and have to withdraw from the All-American Team Cup special event in Atlanta this weekend," Tiafoe wrote via Twitter.

"Over the past two months, I have been training in Florida and tested negative there as recently as a week ago.

"I am scheduled to have a second test early next week, but have already begun the quarantine protocol as advised by the medical staff here in Atlanta.

"While I've been so excited to get back out there, the health and safety of everyone continues to be a top priority."

The tournament said in a statement: "Frances Tiafoe has tested positive for the coronavirus. Like all the players, Tiafoe was tested prior to or upon arrival in Atlanta and has passed daily temperature tests.

"Following his match, he was showing symptoms and was retested and tested positive. Tiafoe has left the event site and will not participate in the remainder of the event. Upon learning this information, we immediately began deep cleaning and sanitising the event site, and enacted protocols in place for contact tracing and alerting individuals who may have been exposed.

"The health and safety of our event participants, staff and attendees are a top priority, and we will continue to diligently enforce all guidelines from local health officials."

The ATP Tour season is scheduled to restart in August, having been suspended in March due to COVID-19.

Top seed Dominic Thiem trails by a set and a break in his quarter-final against qualifier Gianluca Mager after the Rio Open was washed out for the day.

Rain wreaked havoc in Rio, where only two quarter-final matches were completed at the ATP 500 tournament on Friday.

Thiem's back is against the wall, with the Australian Open runner-up and world number four down 7-6 (7-5) 2-1 against Mager – who is featuring in his first ATP Tour quarter-final.

Lucky loser Attila Balazs and qualifier Pedro Martinez were also playing when the rain returned in Brazil, with the latter leading 6-2 2-2.

Cristian Garin managed to win through to the semi-finals after the third seed claimed his seventh successive victory by rallying past Federico Coria 2-6 6-3 7-5.

Next up for Garin is fifth seed Borna Coric, who defeated Lorenzo Sonego 7-6 (7-5) 6-3 on the Brazilian clay.

At the Delray Beach Open, second seed Milos Raonic and fellow big server Reilly Opelka will meet in the semi-finals.

Raonic beat Steve Johnson 7-6 (8-6) 6-3 and 2019 New York Open champion Opelka took down Kwon Soon-woo 6-3 6-4 at the ATP 250 event.

"It's going to be tough. He gets a lot of free points on his serve and you've got to make him play," Raonic said.

"You can't just make him play though because he goes for it from the centre of the court. You've got to move in, you've got to find a way to be aggressive."

Elsewhere, Yoshihito Nishioka overcame teenager Brandon Nakashima 3-6 7-6 (7-5) 6-4 and sixth seed Ugo Humbert eased past 2018 winner Frances Tiafoe 6-1 6-2.

Alex de Minaur and home favourite Jannik Sinner will meet to decide this year's champion at the Next Gen ATP Finals after respective semi-final triumphs over Frances Tiafoe and Miomir Kecmanovic.

Defeated by Stefanos Tsitsipas in last year's final, top seed De Minaur was on scintillating form against his good friend Tiafoe in a 4-2 4-1 0-4 4-2 victory.

The world number 18 – who has three singles titles to his name this season – hardly had to break a sweat as he took complete control in the first two sets.

Heeding the in-game advice of his coach, Tiafoe put in "unconditional effort" at 2-0 down, managing to haul himself back into contention with a supreme display in the third set.

However, De Minaur ultimately had too much firepower and, after a winner teed up match point, a stray shot into the net from Tiafoe handed the 20-year-old a second successive final appearance.

"It's difficult, but easier in some ways [to play a friend]," De Minaur said afterwards. 

"It's easy because you know that no matter what happens on the court, you're still going to be the best of friends.

"In the same manner, you've got to remember that you are opponents, I've got to get in the zone, fired up and motivated, but it worked out."

Facing the Australian in Saturday's title decider will be a favourite of the Milan crowd – 18-year-old wild card Sinner, who rallied from a set down to defeat Kecmanovic 2-4 4-1 4-2 4-2.

Some nervy shots from the world number 95 allowed his Serbian opponent to take a foothold, but Sinner – buoyed on by voracious supporters – soon regained his composure.

Successive breaks of serve across the end of set two and start of set three gave Sinner an advantage he did not relinquish and although Kecmanovic clawed back three match points in the final set, he sent a forehand return out of play to seal the Italian's progression. 

Frances Tiafoe and Miomir Kecmanovic sealed their places in the last four of the Next Gen ATP Finals with straight-sets victories on Thursday.

Tiafoe joined Jannik Sinner in progressing from Group B in Milan with a 4-2 4-2 4-2 defeat of Mikael Ymer.

Second seed Tiafoe missed out on a place in the semi-finals of the season-ending event last year when he was beaten by Jaume Munar, but was not to be denied on this occasion.

The American will face top seed Alex de Minaur, who made it three wins out of three in Group A with an emphatic 4-1 4-0 4-2 beating of Casper Ruud.

Tiafoe went on a five-game streak from 2-1 down in the first set against the Swede at Allianz Cloud and never looked back.

The 21-year-old said: "I'm pretty stoked. I needed this. The second half of this season has been rough for me, so every match is an opportunity for me.

"I love this event and I want to stay. The more you win, the longer you can stay, so I'm happy to be in the semis."

Kecmanovic advanced by seeing off Alejandro Davidovich Fokina 4-1 4-1 4-3 (8-6) in just under an hour.

The Serb will take on Sinner, who went down 4-3 (7-5) 3-4 (3-7) 4-2 4-2 to Ugo Humbert in the final round-robin match.

Alex de Minaur made it two wins from two Next Generation ATP Finals matches as he defeated Miomir Kecmanovic on Wednesday, with Jannik Sinner booking a last-four spot.

Australian De Minaur, the highest-ranked player at the event, secured a 4-1 4-3 (7-3) 1-4 4-0 victory to follow up on his opening Group A win over Alejandro Davidovich Fokina.

Having been made to work hard for his triumph in Milan, particularly during the second and third sets, the 2018 runner-up was pleased with his powers of recovery.

"This is what you expect in these conditions," said the world number 18, referencing the shorter format. "A match can turn quickly. I didn't play badly, he just played well in the important moments.

"I just had to regroup and stick to my game."

The impressive Sinner was a 4-0 4-2 4-1 winner over Mikael Ymer to ensure he will progress from Group B.

Casper Ruud, who lost his opener to Kecmanovic, inflicted a second consecutive defeat on Davidovich Fokina.

Davidovich Fokina took the first set and went the distance but came up short in a 3-4 (2-7) 4-3 (7-2) 4-2 3-4 (2-7) 4-1 loss to the Norwegian.

In the other Group B clash, Frances Tiafoe recovered from his defeat to Sinner by beating Ugo Humbert, who has now suffered back-to-back reverses.

The American boosted his qualification hopes with a 4-2 4-3 (7-5) 3-4 (4-7) 4-1 success.

Alex de Minaur made it two wins from two Next Generation ATP Finals matches as he defeated Miomir Kecmanovic on Wednesday.

The Australian, the highest-ranked player at the event, secured a 4-1 4-3 (7-3) 1-4 4-0 victory to follow up on his opening Group A win over Alejandro Davidovich Fokina.

Having been made to work hard for his triumph in Milan, particularly during the second and third sets, the 2018 runner-up was pleased with his powers of recovery.

"This is what you expect in these conditions," said the world number 18, referencing the shorter format. "A match can turn quickly. I didn't play badly, he just played well in the important moments.

"I just had to regroup and stick to my game."

Casper Ruud, who lost his opener to Kecmanovic, inflicted a second consecutive defeat on Davidovich Fokina.

Davidovich Fokina took the first set and went the distance but came up short in a 3-4 (2-7) 4-3 (7-2) 4-2 3-4 (2-7) 4-1 loss to the Norwegian.

In Group B, Frances Tiafoe recovered from his defeat to Jannik Sinner by beating Ugo Humbert, who has now suffered back-to-back reverses.

The American boosted his qualification hopes with a 4-2 4-3 (7-5) 3-4 (4-7) 4-1 success, while the impressive Sinner thrashed Mikael Ymer 4-0 4-2 4-1.

Next Generation ATP Finals favourite Alex de Minaur started his 2019 campaign with a victory over Alejandro Davidovich Fokina in Milan.

De Minaur lost to Stefanos Tsitsipas in last year's final and is the highest-ranked player competing this time around.

The Australian needed four sets to overcome Alejandro Davidovich 4-2 3-4 (5-7) 4-1 4-1 in Group A.

De Minaur, ranked 18th and a three-time winner on the ATP Tour this year, won eight of the final nine games to wrap up the match in style. 

"I just had to get in my head that I played a good second set," said De Minaur. "He just came up with big shots in big moments.

"I had to move on and remember what I was doing well the whole match. I felt a lot more comfortable as soon as I got the break [in the third set]."

In the same pool, Miomir Kecmanovic claimed a straight-sets victory over Casper Ruud.

There was only one break of serve in the whole contest, which the Serbian won 4-3 (7-5) 4-3 (7-5) 4-2.

In Group B, Swede Mikael Ymer sealed a 4-3 (7-2) 1-4 4-2 4-1 triumph over Ugo Humbert, and Jannik Sinner closed Tuesday's play by coming from a set down to beat Frances Tiafoe 3-4 (4-7) 4-2 4-2 4-2.

Stan Wawrinka has been forced to pull out of a dream home quarter-final against Roger Federer at the Swiss Indoors Basel due to a back injury.

The seventh seed Wawrinka displayed plenty of grit to dispatch of Frances Tiafoe 6-3 3-6 7-5 on Thursday and was set to meet Swiss great Federer in the last eight.

However, Wawrinka – a losing finalist to Andy Murray at last week's European Open – will not be able to take to the court to face Federer for a 27th time.

"The bad news is that I will have to retire," he said.

"I had some trouble with my back in the last game. I'm sure I cannot make it for tomorrow [Friday]. I will pull out."

Third seed Stefanos Tsitsipas had to fight back to avoid an upset against Ricardas Berankis, the Greek recovering to seal a 6-7 (4-7) 6-2 6-4 triumph. 

Filip Krajinovic is up next after he upset fifth seed Fabio Fognini 6-2 6-4, while Roberto Bautista Agut needed three sets to defeat Richard Gasquet.

Reilly Opelka will take on the Spanish fourth seed after he recovered from a set down to defeat David Goffin 6-7 (4-7) 7-6 (7-4) 7-5.

 

Roger Federer acknowledged his struggles against Radu Albot in Miami provided him with motivation for his demolition of the Romanian at the Swiss Indoors Basel.

Federer, seeking his 10th title at his hometown tournament, cruised to a 6-0 6-3 win in his second-round match, needing just 62 minutes to do so on Wednesday.

It was a stark contrast to the 20-time grand slam champion's meeting with Albot in Miami, where he had to come from a set down to win 4-6 7-5 6-3.

"I'm extremely happy because I really struggled against him in Miami and he definitely got my attention there. I was basically a point away from losing," Federer said.

"It was important for me to show a reaction to that match and come out with a proper game plan. I think I learned a lot from that match."

Federer will next face either compatriot Stan Wawrinka or Frances Tiafoe in the quarter-finals. Wawrinka beat Pablo Cuevas 6-3 6-4 while Tiafoe saw off Daniel Evans 6-4 6-2.

Taylor Fritz pulled off a shock in the first round by defeating Alexander Zverev, but he could not back that up in the second as Alex de Minaur claimed a 6-3 6-3 victory over the American. Wednesday's other second-round clash saw Jan-Lennard Struff overcome Henri Laaksonen 6-3 6-4.

Marin Cilic failed to build on his run to the Kremlin Cup semi-finals, the former US Open champion suffering a 6-4 6-4 loss to sixth seed David Goffin.

Ricardas Berankis and Filip Krajinovic were the day's other winners.

Meanwhile, at the Erste Bank Open, Matteo Berrettini bolstered his hopes of securing an ATP Finals spot with a second-round triumph against Grigor Dimitrov.

The Italian, eighth in the Race to London rankings, prevailed in a battle of this year's US Open semi-finalists 7-6 (7-5) 7-6 (7-1), hitting 36 winners to add 45 points to his tally.

Gael Monfils kept his hopes of a spot in London alive by coming from behind to avoid an upset against Dennis Novak. The Frenchman recovered to come through 2-6 7-5 6-3 in his first-round clash.

The other second-round match in Vienna saw Karen Khachanov progress as Marton Fucsovics retired in the third set

Denis Shapovalov fell back down to earth after winning his first ATP title in Stockholm last week, losing 6-3 7-5 to Pablo Carreno Busta. Elsewhere in the draw, there were wins for Mikhail Kukushkin, Andrey Rublev and Sam Querrey.

Andy Murray reached his first ATP Tour singles semi-final for over two years by rolling up his sleeves to overcome Marius Copil in the European Open on Friday.

The three-time grand slam champion's persistence paid off as he battled past Copil with a 6-3 6-7 (7-9) 6-4 victory in Antwerp.

Murray squandered a 4-1 lead in a second set he lost after holding the same advantage in a tie-break, with Copil saving a match point. 

The Brit was not to be denied a place in the last four, winning what was his second quarter-final since returning from hip resurfacing surgery after claiming the only break of the final set.

Ugo Humbert stands in the way of Murray and a place in the final after coming from a set down to beat Guido Pella 5-7 6-4 6-4.

Fourth seed Stan Wawrinka outlasted Gilles Simon 6-3 6-7 (6-8) 6-2 and will face Jannik Sinner, who became the youngest ATP semi-finalist since 2014 when he got past Frances Tiafoe 6-4 3-6 6-3.

There will be no back-to-back Kremlin Cup triumphs for Karen Khachanov in his homeland after Andreas Seppi beat the defending champion 3-6 6-3 6-3.

Seppi has reached at least the quarter-finals in his past six appearances in Moscow and will face Adrian Mannarino - a straight-sets winner against Dusan Lajovic - for a place in the final after claiming the scalp of the second seed.

Marin Cilic took out Jeremy Chardy 6-4 4-6 7-6 (7-2) and will go up against Andrey Rublev, who saw the back of Nikola Milojevic 6-2 6-3.

There will be no dream swansong for Janko Tipsarevic at the Stockholm Open after Yuichi Sugita ended the Serbian's career with a 6-2 4-6 7-6 (7-4) triumph, booking a semi-final showdown with Denis Shapovalov.

Shapovalov eased to a 6-0 6-3 defeat of Cedrik-Marcel Stebe, while Pablo Carreno Busta beat Sam Querrey and will face Filip Krajinovic - conqueror of Yoshihito Nishioka.

Andy Murray moved into the quarter-finals by beating Pablo Cuevas after the top three seeds crashed out of the European Open, while Fabio Fognini was dumped out in Stockholm on Thursday.

Murray produced another encouraging performance in Antwerp, reaching the last eight of a singles tournament for the second time since returning to the ATP Tour following a hip resurfacing operation in January.

The former world number one saw off eighth seed Cuevas 6-4 6-3 after saving all four break points he faced, winning 82 per cent of points on his first serve and 74 per cent behind his second.

Murrray started strongly and dominated from the back of the court, finishing Cuevas off with back-to-back aces to ensure he will take on Marius Copil.

Copil ousted Diego Schwartzman 6-4 5-7 7-6 (9-7), while top seed Gael Monfils went down 6-3 6-2 to 18-year-old Italian outsider Jannik Sinner and David Goffin, the second seed, was thumped 6-3 6-1 by Ugo Humbert in his homeland.

Jan-Lennard Struff was another seed to fall in the second round, losing 6-3 6-4 to Frances Tiafoe.

Janko Tipsarevic's retirement will have to wait until another day after he hammered ATP Finals contender Fognini 6-1 6-1 to move into the quarter-finals of the Stockholm Open.

Tipsarevic lost just four points on his first serve and will take on lucky loser Yuichi Sugita, who beat Stefano Travaglia in straight sets.

Fourth seed Denis Shapovalov got the better of Alexei Popyrin 6-4 7-6 (7-3) in the Swedish capital, with Pablo Carreno Busta and Cedrik-Marcel Stebe also victorious.

Marin Cilic beat fellow Croatian Ivo Karlovic 6-1 7-6 (7-5) to book a Kremlin Cup quarter-final showdown with Jeremy Chardy, who came out on top against Miomir Kecmanovic.

Andrey Rublev and lucky loser Nikola Milojevic came through their second-round matches versus Egor Gerasimov and Alen Avidzba respectively in Moscow.

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