But the internet is filled with conspiracy theories that she was born a man. Theories that Williams is well aware of as she wrote an open letter to her mother, thanking her for her support over the issue, last year.
Williams battled back from a 3-0 deficit in the tie-break to take the first set.
There also is a message she wanted to send about self-worth and feeling powerful as she returned to Grand Slam action with a first-round victory at Roland Garros on Tuesday, about nine months after giving birth to a daughter.
The match between tennis' two comeback queens turned the instant Williams released a primal roar after blasting a backhand return victor after being broken in the opening game of the second set. "I was terrified, and it was a whole new kind of fear".
There's no denying that Serena Williams is the G.O.A.T. But Barty was 18 then and still cutting her teeth on the circuit.
At this point, it is a well known fact that Serena's husband and father of her daughter is just the sweetest, most loving and most supportive man ever!
"Pro-bab-ly", she said with a raised eyebrow as her voice trailed off.
She won her opening match against Krystina Pliskova, but struggled from the outset against Barty in the evening encounter on Philippe Chatrier.
What she lacked on Thursday was a more reliable first serve (she put just 55 percent into play) and a more reliable forehand under duress as Williams started to find her range and attack.
Williams will place the No17 seed, Australia's Ashleigh Barty, in the second round. Yet body-shamers still try to come for her and the muscles that made her a world-known athlete.
Considering the last time she was in a Grand Slam arena she walked off as the champion, albeit while pregnant at the 2017 Australian Open, her hunger for success can not be questioned.
"I feel like a warrior in it, like a warrior princess kind of, queen from Wakanda maybe", Serena said about her Nike catsuit.
After statistics that were so negatively lopsided in that initial set, in which she managed to produce only three winners, Williams straightened things out, to the tune of 25 winners the rest of the way.
I'm not putting any pressure on myself as I normally do The contest between the two big servers - who fired down 28 aces between them - was a tight affair.