While tennis legend Billy Jean King backed Williams" accusation insisting there was a "double standard', many have condemned the 23-time Grand Slam victor for losing her temper.
In addition, Osaka has inked a deal with Nissan that will make the multicultural athlete - the daughter of a Haitian-born father and Japanese mother, raised mainly in the USA - a "brand ambassador" for the Japanese auto maker.
The 20-year-old kept her focus amid opponent Serena Williams' controversial clash with umpire Carlos Ramos to win 6-2 6-4.
Williams received a torrent of support in her claims of sexism after a series of code violations issued by umpire Carlos Ramos sent her into an unflattering meltdown in her straights sets loss on Sunday.
After Ramos had to be escorted off court, Williams used her post-match press conference to suggest that men avoid such punishment for similar on-court behaviour. You will never be on a court with me as long as you live.
"I don't understand from where he's coming with that statement", said Djokovic, suggesting this was the first he has heard of umpires failing to treat men and women equally.
The Japanese player's breakthrough triumph in NY was overshadowed by an explosive row between her opponent Williams and umpire Carlos Ramos which resulted in the 23-times Grand Slam champion being docked a game and fined $17,000.
"I'm fine, given the circumstances", he said.
The anonymous source believes they have not been supported by the USTA on multiple occasions, adding that Ramos was "thrown to the wolves for simply doing his job and was not willing to be abused for it".
Ramos, who is from Portugal, spoke briefly to Portuguese newspaper Tribuna Expresso this week. "You owe me an apology!" she shouted repeatedly.
The International Tennis Federation (ITF) is the governing organization for international tennis. Gold badge umpire Richard Ings told ESPN that the umpire fraternity is "thoroughly disturbed" by how they have been treated in this situation. Mr Ramos's decisions were in accordance with the relevant rules and were reaffirmed by the US Open's decision to fine Ms Williams for the three offences.