Tuesday's return was striking, from Williams' powerful shots to her outfit, which called to mind the "catsuit" she wore at the 2002 U.S. Open.
As Williams - and her eye-catching outfit - grabbed the headlines, there were wins but a few scares for 10-time champion Rafael Nadal and two-time victor Maria Sharapova.
Laughing as she made reference to the fictional nation in sub-Saharan Africa, which is home to superhero Black Panther from Marvel Comics, Williams told reporters: "I feel like a warrior in it, like a warrior princess, a queen from Wakanda maybe. Olympia was born and she had my arms, and instead of being sad and fearful about what people would say about her, I was just so happy".
"I remember one day, I couldn't find Olympia's bottle and I got so upset I started crying because I wanted to be ideal for her". So the suit has definitely a little functionality to it.
In an Instagram following the match, Williams dedicated her first time back on the court to all the moms out there.
"I'm always living in a fantasy world".
The suit is, however, not only fun but also functional.
The 23-time major victor won her first-round match against Kristyna Pliskova in straight sets to advance to the next stage - and she did it dressed in the most memorable tournament attire seen thus far at Roland Garros.
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"I'm not going to play if I don't think [I can win]", she proclaims. So I was just winging it in the last minute.
"I think she played better than I expected, so it was a tough match".
Ohanian and Williams welcomed baby Alexis Olympia, their first child together, on September 1 2017.
"I've been injured so many times, and played on it, my body is used to adjusting".
VideoThe tennis career of Bernard Tomic has taken another freakish chapter, with the Aussie losing out to a player who drove more than ten hours to make the match. The fear that I might not come back as strong as I was. "I really try to put her first in my life". Australian Ashleigh Barty awaits her in the second round. She could be considered the most unlucky of seeds in a Grand Slam, for there can never have been a more risky floater in the draw.
"What she's done to be able to get back, along with Vika (Azarenka), as well, and a lot of the other girls who are coming back after pregnancy is a pretty incredible thing".
Williams elaborated on her comments in another interview, adding that she hoped her on-court appearance would inspire "a whole different group of wonderful women".