The 20-year-old Canadian, who has not competed since she suffered a knee injury last October, said on Twitter she made the difficult decision because the COVID-19 outbreak has compromised her ability to reach her highest level of form.
Nadal will resume his fight to stay in the French Open on Thursday
A final decision is expected by March based on the hosting and COVID-19 contingency proposals received from bidders.
World number two Nadal's fate will rest on his final group match against Tsitsipas.
23-times Grand Slam winner Serena Williams said she is a Roger Federer 'superfan'.
Grit, determination, nerves were all on show at the US Open final.
A round-up of Wednesday's action in the UEFA Champions League.
Images from the US Open final played at Flushing Meadows on Sunday
Nadal committed 30 unforced errors to Schwartzman's 17 and had his serve broken five times.
World number two Rafael Nadal confirmed on Tuesday that he will not defend his US Open crown this year at Flushing Meadows as organisers released the singles entry list for the Grand Slam. Spain's Nadal had said in June that he had reservations about travelling to the U.S. amid the COVID-19 pandemic and he joins women's world number one Australian Ash Barty in skipping the tournament due to COVID-19 concerns.
Sparks flew when they met for the first time on the ATP Tour in Miami, with Medvedev confronting the Greek over his on-court conduct.
Former champions Novak Djokovic, Rafael Nadal and Serena Williams have all entered next month's Western & Southern Open in New York, which will serve as a tune-up for the US Open, tournament organisers said on Wednesday. Organisers of the August 20-28 event, which was relocated from Cincinnati this year because of COVID-19, said defending champions Daniil Medvedev and Madison Keys are also among the initial entries.
A round-up of Tuesday's action in the UEFA Champions League.
World number one Rafael Nadal begins his French Open title defence, on Monday, with a clash against Italy's Simone Bolelli on Court Philippe-Chatrier.
Debutant Stefanos Tsitsipas crushed defending champion Alexander Zverev 6-3, 6-2 on Wednesday to book his place in the last four of the ATP Finals with a match to spare.
A very different Australian Open comes to a familiar end on Sunday as Novak Djokovic looks to thwart another challenge to his Melbourne Park dynasty from the latest Grand Slam aspirant in Daniil Medvedev.
Friction has dogged the ATP Player Council, whose president is world number one Novak Djokovic, this year since ATP president Chris Kermode failed to gain support for another term.
Mark your calendars! Here's all the lowdown of all the major sporting events coming up in 2022...
The 20-time Grand Slam champion smoothly pressed the accelerator to take the tiebreak and outclassed Cilic in the fourth set to claim a 6-2, 2-6, 7-6 (4), 6-2 win.
ATP Tour remembered Maradona with a social media post saying "A champion and icon loved by all", accompanied with a picture of Maradona with Federer.
A look at Roger Federer's worst five Grand Slam losses.
A round-up of Wednesday's action in the UEFA Champions League.
Rafael Nadal continued his imperious run of form as he swept aside American Donald Young 6-4, 6-2, 7-5 in the Wimbledon second round on Wednesday.
Off-court distractions and a neck injury could not prevent Novak Djokovic from extending his winning run this year to 23 matches and the Serbian could not be in more intimidating form ahead of the US Open.
Australia's second-most populous state of Victoria reported no local coronavirus cases on Saturday for the second straight day, boding well for the Australian Open tennis tournament due to start in Melbourne on Monday.
Laver Cup organisers say the exhibition event will go ahead in September as planned despite the French Open moving to the same dates as the implications of the French Tennis Federation (FFT)'s shock gambit began to reverberate on Wednesday. The September 25-27 Laver Cup, an exhibition event co-created by Roger Federer which has always featured the Swiss great and one of Rafael Nadal or Novak Djokovic.
Thousands of mask-free spectators flocked into the stadium
Australia's Victoria state Premier Daniel Andrews said he opposed special arrangements to let unvaccinated athletes compete in the state, which is scheduled to host the Grand Slam at Melbourne Park in January.
Professional tennis has been suspended until the end of July, at the earliest, and Rafael Nadal said that serious problems stand in the way of a resumption. Nadal, 33, said that even when tennis does resume the players will need to recover their fitness levels.
Novak Djokovic clawed his way to a two sets to one lead over great rival Rafael Nadal before their scintillating Wimbledon semi-final was paused on a knife-edge on Friday.
Rafael Nadal smoothly negotiated the potential stumbling block presented by Frenchman Benoit Paire on Monday, launching his bid for a 10th French Open trophy with a largely routine 6-1, 6-4, 6-1 win.
The French Open, traditionally held in May-June, was postponed earlier this year due to the COVID-19 pandemic and will now be held at Roland Garros from Sept. 27-Oct. 11.
Rafael Nadal fired hosts Spain into the Davis Cup final as he joined Feliciano Lopez to win a thrilling late-night doubles and seal a nail-biting 2-1 victory over Britain on Saturday.
Newcastle's worries deepened as they now remain at 19th in the table.
Garbine Muguruza officially became the world number one as the Women's Tennis Association (WTA) updated the rankings on Monday.
Nadal will have the chance to claim the top spot back on Monday if he wins his third title in Acapulco
For the second time in three days at the ATP Finals, Rafael Nadal fought off one of the game's rising powers but beating Greek Stefanos Tsitsipas proved in vain as his semi-final hopes vanished on Friday.
'I didn't like losing to India in the amazing series, no one likes losing. I'm absolutely committed, I love my job, I love the Australian cricket team, I love the players and I love Australian cricket.'