Roger Federer of Switzerland returns the ball during the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Roger Federer of Switzerland returns the ball during the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Roger Federer of Switzerland celebrates after the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Roger Federer of Switzerland returns the ball during the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Roger Federer of Switzerland celebrates after winning the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Roger Federer of Switzerland returns the ball during the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Roger Federer of Switzerland reacts after the men's singles third round match against Cameron Norrie of Great Britain at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Katerina Siniakova of the Czech Republic competes during the women's singles third round match against Ashleigh Barty of Australia at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Coco Gauff of the United States returns the ball during the women's singles third round match against Kaja Juvan of Slovenia at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Kaja Juvan of Slovenia reacts during the women's singles third round match against Coco Gauff of the United States at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Coco Gauff of the United States returns the ball during the women's singles third round match against Kaja Juvan of Slovenia at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)

Coco Gauff of the United States returns the ball during the women's singles third round match against Kaja Juvan of Slovenia at Wimbledon tennis Championship in London, Britain, July 3, 2021. (Photo: Xinhua)