Serena Williams has been fined US$17,000 (NZ$26,006) for the code violations she received during the US Open final, the United States Tennis Association (USTA) has announced.
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During Sunday's (NZ time) match, which she lost 6-2 6-4 to Japan's Naomi Osaka, Williams was handed a coaching violation and a point penalty for breaking her racquet, before a heated argument with umpire Carlos Ramos ended with her losing a game.
The tournament referee's office fined the former world number one US$10,000 (NZ$15,298) for the "verbal abuse" of Ramos, US$4000 (NZ$6119) for being warned for coaching and US$3000 (NZ$4589) for smashing her racket.
Williams, who was seeking a record-equalling 24th Grand Slam singles title, vigorously disputed each of the violations during the match.
She demanded Ramos apologise for handing her a coaching violation and later called the umpire a "thief" for giving her a point penalty.