Williams also said she will be undergoing an MRI scan in Paris on Tuesday to find out the full extent of her injury. She gave birth to daughter Alexis Olympia in September and had mounted a comeback in what she called her "Wakanda-inspired catsuit" at Roland-Garros. She said she tried to tape it up to add support, but "it didn't get a lot better".
"It's really hard to be in this situation, but... for now in my life, I just always try to think positively and just think of the bigger picture and hopefully (I can play in) the next events and the rest of the year".
But even the American 23-times Grand Slam champion, back after having her first child in September, must have been bewildered when a USA reporter tried to throw a new light on her fierce rivalry with old foe Maria Sharapova, who she faces in the French Open last 16 on Monday. "Her game matches so well against mine, and it is hard, because like I keep saying, I've given up so much to be here".
The 36-year-old player added that the Russian tennis star is the favorite on Monday, as she's just resumed playing after having a baby, while Sharapova has produced the best performance so far in her return to Grand Slam tennis.
Kasatkina, the 14th seed, will meet another Grand Slam victor, US Open champion Sloane Stephens, in the final eight. Over the weekend, after they had advanced to a fourth-round French Open matchup against each other, Williams was asked about that book, the one written by Sharapova.
Sharapova wished Williams a speedy recovery and a rapid return to the tour in a two-sentence statement released by French Open organizers.
"Right now I can't actually serve", said Williams, according to the New York Times.
Serena Williams has been ranked No 1 in singles contests eight separate times by the Women's Tennis Association (WTA). She cited a problem with her pectoral muscle as the reason for her decision.
It has been nearly 2-1/2 years since Williams and Sharapova last faced off across the net but when it comes to these two great on-court foes, absence does not make the heart grow fonder.
"Every match has been getting better for me".
"I made a promise to myself and to my coach and to my team that if I'm not at least 60% or 50%, then I probably shouldn't play". I can't say I have been intimated by anyone.
"I have cried in the locker room many times after a loss and that's what I have seen a lot of people do".