Halep said she would not recover from a calf injury in time, Wawrinka underwent foot surgery that would rule him out of the Games
Osaka, 20, shot to international fame on Saturday when she defeated 36-year-old American Serena Williams at Flushing Meadows to become the first Japanese player to claim a Grand Slam singles crown.
Images from Day 6 of the Australian Open in Melbourne on Saturday.
List of French Open women's singles champions
Halep, who won the French Open in 2018 and Wimbledon the following year, struggled for results last year due to injuries and reached only one WTA final, at the Transylvania Open, losing in her home tournament.
Wozniacki battles past Kerber into Eastbourne final
US Open has over the years seen an increase in celebrity attendance. Rediff.com takes a look at a few known names seen in the Flushing neighborhood of the Queens borough of New York.
Images from the Australian Open matches played on Tuesday.
List of French Open women's singles champions:
Serena Williams launched a charm offensive on Sunday as she sought to broker a truce with Maria Sharapova and calm the storm surrounding comments she made about a rape victim.
Fourth seed Rafael Nadal survived a few anxious moments before booking his place in the semi-finals of the BNP Paribas Open with a see-sawing 6-4, 6-3 victory over Japanese Kei Nishikori at Indian Wells in California on Friday.
IMAGES from the Australian Open on Tuesday.
Top seed Rafa Nadal overwhelmed Russia's Daniil Medvedev 6-3, 6-0 to win his fifth Rogers Cup on Sunday in Montreal -- the first time he has retained a title outside of clay.
Venus Williams will miss the upcoming US Open due to an injury, becoming the third U.S. female after her sister Serena and Sofia Kenin to announce on Wednesday they would not take part in the final Grand Slam tournament of the year.
Serena Williams moved another step closer to a record-tying 24th career Grand Slam title with a comfortable 6-3, 6-2 victory over Czech Karolina Muchova on Friday to reach the last 16 at the US Open.
No current athlete in the world of sport can match the 31-year-old for reliability at present and the American, despite a brief blip, eased past Luxembourg's Mandy Minella 6-1, 6-3.
Iga Swiatek will be looking to join a select band of players who have lifted the Suzanne Lenglen Cup four times
While the United States has the highest number of confirmed COVID-19 cases in the world, New York seems to have a better handle on the virus and reported less than 5,000 new cases last week.
World No 2 Rafael Nadal brushed aside American Jared Donaldson 6-1, 6-1 and will next face Diego Schwartzman after the Argentine beat Roberto Carballes 6-3, 6-1.
Here are eight women to watch during the US Open which starts on Monday.
A competitor lambasted the French Open as "one big circus" on Thursday as soggy weather once again came back to exasperate players seeking a foothold in the semi-finals of the rain-hit claycourt major.
Serena Williams said the latest chapter in her tennis life was "just beginning" on Saturday after seeing her hopes of a record-equalling 24th Grand Slam title dashed in the Wimbledon final.
Maria Sharapova, Serena Williams and Andy Murray were the big names to win on Monday and advance to the quarter-final of the Wimbledon.
A summary of sports events and sports persons, who made news on Wednesday
Sania Mirza will take on Venus Williams in the opening singles match at the Watson Water Champions Challenge.
Maria Sharapova rallied to beat Kaia Kanepi on Thursday and will meet Serena Williams in the Brisbane International semi-final knowing she must drastically improve to end her run of 13 straight defeats against the world number one.
Top seed Simona Halep was pooled with grand slam winners Maria Sharapova and Flavia Pennetta in a formidable looking Red Group for the end-of-season WTA Finals on Friday.
A six-time champion at Flushing Meadows, Williams was once money in the bank when it came to the US Open
Timea Bacsinszky wants a lasting souvenir at the French Open.
Despite boasting 34 Grand Slam singles titles between them, Serena Williams and Roger Federer were forced to share the spotlight with a 15-year-old at the US Open on Tuesday as all three advanced to the second round.
Garbine Muguruza is aiming to become the first Spanish woman for 23 years to win Wimbledon - and yet again a Williams sister stands in her way.
Images from the Australian Open in Melbourne on Thursday.
The 23-times Grand Slam champion looked a completely different player from the person who smashed her way into the semi-finals of the doubles with Caroline Wozniacki on Wednesday but managed to do just enough to beat the 86th-ranked McHale.
Fashion statements from Roland Garros...
Those not familiar with seeing Swiatek close up can expect to see her sliding on Wimbledon's grass, as she does on the clay
Ana Konjuh was not a year old when Serena Williams played her first US Open match but both will be in the Arthur Ashe Stadium spotlight on Wednesday, with four gripping quarter-finals to take centre stage at the year's final Grand Slam.
The German fifth seed kicks off her campaign against compatriot Tatjana Maria on Tuesday, but could potentially face three former champions in Serena Williams, Garbine Muguruza and Maria Sharapova if she goes deep into the tournament.
Simona Halep became the first Romanian in 40 years to lift the French Open trophy at Roland Garros on Saturday.
Some players and pundits have criticised the rule as being hard to police, spottily enforced and highly subjective, and called for the ban on coaching from the players' box to be lifted.
