Serena Williams has accused an umpire of sexism and treating her more harshly than men as she used a press conference to double down on her earlier on-court tirade at the official during her US Open final defeat to Japan’s Naomi Osaka.

Williams was cited by official Carlos Ramos for three code violations during her 6-2, 6-4 loss to the 20-year-old Osaka on Saturday: for getting coaching signals; for breaking her racket, which cost her a point; and for calling the chair umpire a thief, which cost her a game.

But despite the match penalties, she renewed her attack at a media conference later...

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