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Ashleigh Barty of Australia serves during the women's singles fourth round match with Alison Riske of the United States at the 2019 Wimbledon Tennis Championships in London, Britain, on July 8, 2019. (Xinhua/Han Yan)

Ashleigh Barty of Australia serves during the women's singles fourth round match with Alison Riske of the United States at the 2019 Wimbledon Tennis Championships in London, Britain, on July 8, 2019. (Xinhua/Han Yan)