Serena Williams has pulled out of the Yarra Valley Classic due to a right shoulder injury.

Williams, the winner of 23 Grand Slam singles titles, had set up a mouth-watering semi-final clash against world number one Australian Ash Barty after defeating fellow American Danielle Collins 6-2 4-6 (10-6) on Margaret Court Arena.

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"Serena Williams has withdrawn from the Yarra Valley Classic singles draw due to a right shoulder injury," the women's tour said on Twitter.

"Ashleigh Barty advances to the final by walkover."

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