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Alexei Popyrin, of Australia, serves to Frances Tiafoe, of the United States, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Alexei Popyrin, of Australia, serves to Frances Tiafoe, of the United States, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Alexei Popyrin, of Australia, reacts against Frances Tiafoe, of the United States, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Alexei Popyrin, of Australia, reacts against Frances Tiafoe, of the United States, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Frances Tiafoe, of the United States, reacts during a match against Alexei Popyrin, of Australia, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Frances Tiafoe, of the United States, reacts during a match against Alexei Popyrin, of Australia, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Frances Tiafoe, of the United States, reacts against Alexei Popyrin, of Australia, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)

Frances Tiafoe, of the United States, reacts against Alexei Popyrin, of Australia, during the fourth round of the U.S. Open tennis tournament Sunday, Sept. 1, 2024, in New York. (AP Photo/Adam Hunger)