Williams held court Monday night in a statement-making, one-shouldered dress that celebrates her love of dance and ballet with a tiered, tulle skirt that creates a tutu effect.
Proof that the power of a good outfit knows no boundaries, the 36-year-old was victorious in her first round, defeating Poland's Magda Linette 6-4 6-0. The organisation's president, Bernard Giudicelli, said they "would not longer be accepted'".
But after French Open organizers ruled out a repeat of the black catsuit she wore in Paris for next year, all eyes were on what the 23-time grand slam singles champion would be wearing at Flushing Meadows.
The stance has been heavily criticised, particularly given Williams wore the catsuit partly to help prevent the potentially fatal blood clots to which she is prone.
The American showed no hesitation storming through the second set and finishing off her opponent with a thundering ace.
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"It feels like this suit represents all the women that have been through a lot mentally, physically, with their body to come back and have confidence and to believe in themselves", she said.
And a third added: "You can't wear a catsuit to play [tennis]". Serena Williams is the role model even big girls needed.
Williams' US Open tutu garnered top scores from tennis and fashion enthusiasts alike, many of whom took to the Internet to share their feelings about the matter.
On Instagram, the Off-White founder and artistic director at Louis Vuitton Men's shared his excitement over the US Open look writing, "willing to design dresses for her for life". "I feel like a warrior in it, like a warrior princess, a queen from Wakanda maybe", she said.
"I really believe when you have a tournament like Wimbledon that they do what they want".