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Four-time Grand Slam winner and comeback star Kim Clijsters of Belgium will join the New York Empire in World TeamTennis (WTT), which kicks off its three-week regular season on Sunday.

World TeamTennis to kick off season with safety measures in place
Frances Tiafoe

Frances Tiafoe tests positive for coronavirus a day after playing in front of fans

Why rhythm is important in tennis
Swiss star Stan Wawrinka needed two hours and 45 minutes to edge Frances Tiafoe 6-3, 6-7 (4-7), 7-6 (7-1).

Wawrinka survives tough Acapulco opener
Top seed Dominic 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 Gianluca Mager – who is featuring in his first ATP Tour quarter-final.

ATP: Rio rain gives trailing Thiem time to regroup, Raonic reaches Delray semis

Qatar Open: Bopanna-Koolhof pair beats Tiafoe-Wawrinka duo

Next Gen ATP Finals: Tiafoe and Kecmanovic complete semifinal line-up

Swiss Indoors: Wawrinka pulls out of Federer quarterfinal with back injury

Alexander Zverev seals easy first-round China Open win

Andy Murray aims for singles return this year

Goffin ends Sousa's reign in Estoril

Miami Open: Federer outclasses Anderson

Miami Open: Second seed Zverev goes down to Ferrer

The Americans are coming — back

Thiem crashes out in Rio, Del Potro makes winning return

Novak the Great reigns again in Australia

Nadal downs Tiafoe to set up Tsitsipas semi

Australian Open: Tsitsipas into first Slam semifinal

Tsitsipas in dreamland after ousting Federer, birthday boy Tiafoe breaks new ground

Birthday boy Tiafoe to face Nadal in first Slam quarters

Nadal outclasses Berdych en route to quarters

Australian Open 2019: Cilic battles back to join Nadal, Federer in fourth round

Australian Open 2019: Nadal and Federer march on as rising stars prosper

Australian Open: Fifth seed Kevin Anderson crashes out

Australian Open: Prajnesh loses to Tiafoe on Grand Slam debut

Prajnesh Gunneswaran: ‘This is just the beginning’

Hopman Cup: Serena Williams completes singles clean sweep

Serena: Federer encounter the match of my career

Hopman Cup: Federer beats Tiafoe and looks forward to playing Serena

Fired-up Federer hoping for another 'crazy good' season

Nishikori squashes Paire to reach Tokyo quarters

Team World humbles Federer-Djokovic at Laver Cup

Croatia beats US to set up Davis Cup final with France

Tennis clocks get good reviews but cut into tune time

Ramkumar, Paes make early exits from Atlanta Open

Isner, Johnson reach Houston quarters

Tiafoe wins two matches in a day to reach Delray Beach final

Del Potro stunned by Tiafoe at Delray Beach Open

Murray to face Harrison in Brisbane second round

Tiafoe torn apart in Federer's Basel lair

Federer survives scare to get past Tiafoe