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Jannik Sinner, of Italy, holds the championship trophy after defeating Taylor Fritz, of the United States, in the men's singles final of the U.S. Open tennis championships, Sunday, Sept. 8, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Jannik Sinner, of Italy, holds the championship trophy after defeating Taylor Fritz, of the United States, in the men's singles final of the U.S. Open tennis championships, Sunday, Sept. 8, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Jannik Sinner, of Italy, holds up the championship trophy after defeating Taylor Fritz, of the United States, in the men's singles final of the U.S. Open tennis championships, Sunday, Sept. 8, 2024, in New York. (AP Photo/Julia Nikhinson)

Jannik Sinner, of Italy, holds up the championship trophy after defeating Taylor Fritz, of the United States, in the men's singles final of the U.S. Open tennis championships, Sunday, Sept. 8, 2024, in New York. (AP Photo/Julia Nikhinson)

Roman Safiullin of Russia returns a shot from Jannick Sinner of Italy during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Roman Safiullin of Russia returns a shot from Jannick Sinner of Italy during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy tosses his racket as he waits for play against Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy tosses his racket as he waits for play against Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Italy's Jannick Sinner rests between sets against Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Italy's Jannick Sinner rests between sets against Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy tosses a ball as he waits for play against Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy tosses a ball as he waits for play against Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy autographs for fans after defeating Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy autographs for fans after defeating Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

FILE - Jannik Sinner, of Italy, wipes sweat from his face between serves to Mackenzie McDonald, of the United States, during the first round of the U.S. Open tennis championships, Tuesday, Aug. 27, 2024, in New York. (AP Photo/Kirsty Wigglesworth, File)

FILE - Jannik Sinner, of Italy, wipes sweat from his face between serves to Mackenzie McDonald, of the United States, during the first round of the U.S. Open tennis championships, Tuesday, Aug. 27, 2024, in New York. (AP Photo/Kirsty Wigglesworth, File)

Jannick Sinner of Italy autographs for fans after defeating Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)

Jannick Sinner of Italy autographs for fans after defeating Roman Safiullin of Russia during the China Open tennis tournament held at the National Tennis Center in Beijing, Saturday, Sept. 28, 2024. (AP Photo/Ng Han Guan)