Williams was sanctioned in the second set by the judge seated at the net, Portugal's Carlos Ramos, for receiving help, in the form of a hand signal, from the box of her coach, Patrick Mouratoglou, breaking her racket against the court surface and verbally abusing the judge by calling him a 'thief', according to a report.
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Williams, who was fined on Sunday, called the judge's decision "sexist" at a later press conference, saying that she had seen male players calling umpires "several things" but they were not penalized for their behaviour.
Her actions eclipsed the triumph of the 20-year-old Osaka, who became the first Japanese tennis player to win the US Open and a Grand Slam single's tourney.
The US player, 36, who was competing in her 14th US Open, failed to win her seventh title in the season's last Grand Slam event, a win that would have been the 24th of her career, thus allowing her to tie the legendary Margaret Court of Australia in terms of tourney wins.
Williams received $1.85 million for playing in the final. Her fine will be deducted from that amount.
IANS