There are fears that the defending champion may not be able to play in New York after sustaining a new injury.
The Serbian has issued his opinion on the decision to make Naomi Osaka play on one of the smaller courts at the combined tournament.
The world No.1 is starting to regain some of her momentum ahead of the final grand slam of the year.
Experience helped Serena Williams defeat Naomi Osaka to reach the Toronto semi-finals, as she looks for a fourth Rogers Cup title.
The world No.2 looks ahead to the next chapter of her rivalry with Williams.
The Japanese pllayer speaks out about the 'worst months of her life.'
The former world No.1 outlines her goals for the upcoming Olympic Games.
It was a heartbreaking day for the world No.2 at The All England Club.
Naomi Osaka crashed out of the Nature Valley Classic with a shock straight-sets loss to Yulia Putintseva.
Naomi Osaka talked about her change in attitude after a stressful clay court season ended in an early exit at the French Open.
French Open champion Ashleigh Barty and World No.3 Karolina Pliskova are the favourites for the title after Kvitova was forced to withdraw.
The world No.1 reacts to her exit from Roland Garros.
The world No.1 produced an error-stricken performance against the underdog as her 16-match winning streak at grand slam tournaments comes to an end.
Naomi Osaka had to battle hard to overcome a tricky test in Victoria Azarenka to reach the last 32 in Paris.
The two former players share their opinions about the two-time grand slam champion.
Naomi Osaka survived a big scare to advance to the second round of Roland Garros.
Ubitennis' guide to the five women who could exit the French Open as world No.1.
Ubitennis reflects on Roger Federer and Naomi Osaka's withdrawal from Rome on Friday.
The two-time grand slam champion reflected on her current form following her latest win in Madrid.
Naomi Osaka survived a testing three-set encounter with Sara Sorribes Tormo to progress to the third round in Madrid for the first time.