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Novak Djokovic, of Serbia, reacts against Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, reacts against Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, serves to Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, serves to Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, shakes hands with Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, shakes hands with Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, wipes his face against =Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, wipes his face against =Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts against Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts against Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, returns a shot to Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, returns a shot to Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, tries to stay cool during a third round match against Alexei Popyrin, of Australia, of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, tries to stay cool during a third round match against Alexei Popyrin, of Australia, of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts against Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts against Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, returns a shot to Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, returns a shot to Novak Djokovic, of Serbia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts Novak Djokovic, of Serbia,during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts Novak Djokovic, of Serbia,during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, reacts during a third round match against Alexei Popyrin, of Australia, of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, reacts during a third round match against Alexei Popyrin, of Australia, of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts Novak Djokovic, of Serbia,during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts Novak Djokovic, of Serbia,during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, walks past Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Novak Djokovic, of Serbia, walks past Alexei Popyrin, of Australia, during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts Novak Djokovic, of Serbia,during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)

Alexei Popyrin, of Australia, reacts Novak Djokovic, of Serbia,during a third round match of the U.S. Open tennis championships, Friday, Aug. 30, 2024, in New York. (AP Photo/Julia Nikhinson)