Williams was cited by Carlos Ramos three times Saturday during her 6-2, 6-4 loss to Naomi Osaka: for getting coaching signals; for breaking her racket, which cost her a point; and for calling Ramos a thief, which cost her a game.
On Sunday, the tournament referee docked Williams $10,000 for "verbal abuse" of the chair umpire, $4,000 for being warned for coaching and $3,000 for breaking her racket.RELATED STORIES
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The ITF said in a statement Monday that Ramos' citations were "reaffirmed by the U.S. Open's decision to fine Serena Williams for the three offences."
The governing body of tennis added that: "Ramos undertook his duties as an official according to the relevant rule book and acted at all times with professionalism and integrity."