'I've never felt this in my life so I don't really know how to manage it yet, ' she said.
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.
She will await the victor of Monday's match between Spaniard-Venezuelan Garbine Muguruza and Ukrainian Lesia Tsurenko.
"I am going to come up on surfaces that are my absolute favorites to play on and do best on so hopefully I will continue to heal", said Williams.
Serena was seen facing difficulty in even lifting her bag off court after her match on Sunday.
"The book was 100% hearsay - at least all the stuff I read and the quotes that I read, which was a little bit disappointing".
The 31-year-old Russian, a two-time victor at Roland Garros, will play 2016 champion Garbine Muguruza. "Right now I can't actually serve it's kind of hard to play", she told a packed press room.
Williams made clear she didn't reserve any special on-court treatment for Sharapova.
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Serena Williams defeated Goerges 6-3, 6-4 in the third round to set up a clash against Sharapova who made short work of Czech sixth seed Karolina Pliskova 6-2, 6-1.
Williams will renew her heated on-court rivalry with Sharapova when they meet in a hotly-anticipated fourth-round contest at the French Open on Monday.
There have been clashes over their private lives, while Sharapova claimed a year ago in her book that Serena "hates" her for hearing her cry after the 2004 Wimbledon final. I thought it was a flawless opportunity to see how I was going.
Sharapova's Unstoppable: My Life So Far, released during her doping ban past year, claimed Williams hated her following the Russian's surprise win at the Wimbledon final in 2004. "Physically I'm doing great", she said.
But Serena Williams, like the unbothered powerhouse she is, shrugged off the suggestion and shut the reporter's ridiculous questions down.
The American also revealed that she will remain in Paris to undergo an MRI on Tuesday.
Which is about as believable as another Sharapova claim in her book.
She used her time away from the game to write an autobiography titled Unstoppable: My Story So Far.
"I'm going to stay here and see some of the doctors here, see as many specialists as I can". I can't say I have been intimidate by anyone.