'I just don't understand' - Serena Williams doubles down on claims of sexism in US Open final

Serena Williams is holding her ground on claims of sexism against chair umpire Carlos Ramos, following her explosive outburst at last week's US Open final defeat.

Williams, 36, a 23-time single grand slam champion, was given three separate code violations in her loss in the US Open final, resulting in Naomi Osaka being awarded a crucial point penalty which gifted her game seven of the second set, then an even more crucial game penalty to gift her the next game, and a 5-3 second set lead.

She would later add that the incident was sexist, and that male players are able to get away with worse on-court infringements.

Appearing on Australia's The Project, Williams spoke publicly for the first time about the ordeal.

"I just don't understand … if you're a female you should be able to do even half of what a guy can do," Williams said. 

Williams also hit back at Ramos' claims that she'd received coaching from trainer Patrick Mouratoglou - which he'd admitted to - denying her own involvement.

"He said he made a motion."

"I don't understand what he was talking about. We've never had signals."

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