Sloane Stephens of the US celebrates winning a point against Czech Republic's Petra Kvitova during the women's singles match on day one of the Wimbledon Tennis Championships in London, Monday June 28, 2021. (AP Photo/Kirsty Wigglesworth)

Sloane Stephens of the US celebrates winning the women's singles match against Czech Republic's Petra Kvitova on day one of the Wimbledon Tennis Championships in London, Monday June 28, 2021. (AP Photo/Kirsty Wigglesworth)