Frances Tiafoe of the United States returns the ball during the men's singles round of 16 match between Frances Tiafoe of the United States and Alex De Minaur of Australia at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)

Ben Shelton of the United States returns the ball during the men's singles round of 16 match between Flavio Cobolli of Italy and Ben Shelton of the United States at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)

Frances Tiafoe of the United States returns the ball during the men's singles round of 16 match between Frances Tiafoe of the United States and Alex De Minaur of Australia at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)

Flavio Cobolli of Italy serves during the men's singles round of 16 match between Flavio Cobolli of Italy and Ben Shelton of the United States at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)

Flavio Cobolli of Italy serves during the men's singles round of 16 match between Flavio Cobolli of Italy and Ben Shelton of the United States at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)

Frances Tiafoe of the United States reacts during the men's singles round of 16 match between Frances Tiafoe of the United States and Alex De Minaur of Australia at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)

Ben Shelton of the United States celebrates scoring during the men's singles round of 16 match between Flavio Cobolli of Italy and Ben Shelton of the United States at the 2025 National Bank Open tennis tournament in Toronto, Canada, on Aug. 3, 2025. (Photo by Zou Zheng/Xinhua)