The US superstar claimed that presiding judge Carlos Ramos imposed sanctions for infractions that male players could have gotten away with it, specifically a verbal abuse violation after she called him a "thief" and a "liar" for warning him about the training of his players' box, then docking a point when a violation of racket abuse followed.
Eventually she was caught in a game, putting Osaka on the verge of victory.
Simon said the issue raised the issue of whether different standards are applied to men and women in the refereeing of matches.
"The WTA believes that there should be no differences in the standards of tolerance that are given to the emotions expressed by men against women and is committed to working with sport to ensure that all players receive the same treatment," he said.
"We do not believe this was done last night."
Serena Williams was very outraged by the first violation of the code she received, for training from her box.
It is not clear if she saw the gestures with the hand of coach Patrick Mouratoglou sitting in his box, although he admitted in an interview with ESPN that he was trying to advise her, and said that all coaches do.
Coaching & hypocrisy & # 39;
"Yes, I was training like everyone else, we have to stop this hypocrisy, and Serena did not even see my gestures, she felt humiliated by the warning," said the Frenchman.
Simon said that the sport as a whole should review the rules on training, and noted that the WTA already allows on-court training during regular tour events, if a player requests it.
The great American Billie Jean King addressed both issues, and also saw things in the manner of Serena.
"When a woman is excited, she's hysterical and is penalized for that," King tweeted. "When a man does the same thing, he's 'frank' and there's no repercussions, thanks, @serenawilliams, for invoking this double standard, you need more voices to do the same."
The president of the National Organization of Women, Toni Van Pelt, intervened with a statement calling on the USTA to cut off any link with Ramos for "an openly racist and sexist movement."
Serena Williams 'pleas to arbitrate Brian Earley and a Grand Slam supervisor – called to court after she failed to obtain Ramos' satisfaction – were in vain.
The USTA said in a statement after the game that the decision to deliver the violation of the final code and the penalty of the game "was not reviewable."
"Since I'm a woman, you're going to do this to me," he was amazed on the court and after the game, Williams did not drop that accusation.
"I've seen other men call other arbitrators several things," he said. "I am here fighting for the rights of women and for the equality of women and for all kinds of things."
The men's champion, Novak Djokovic, was cautious when asked about the issue.
Djokovic noted that it was an "uncomfortable situation" for both competitors and "hard" for the referee.
"I have my personal opinion that maybe the chair umpire should not have pushed Serena to the limit, especially in a Grand Slam final," he said.
"It changed the course of the game, in my opinion, maybe it was unnecessary, we all went through our emotions, especially when you are fighting for a Grand Slam trophy.
However, he said he was not sure that sexism was at the root of Ramos' decisions.
"It's difficult to generalize things," he said.