Germany's Alexander Zverev reacts during the semifinal tennis match against Taylor Fritz of the United States at the ATP World Tour Finals at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Germany's Alexander Zverev returns to Taylor Fritz of the United States during their semifinal tennis match of the ATP World Tour Finals at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Germany's Alexander Zverev watches a video review during the semifinal tennis match against Taylor Fritz of the United States at the ATP World Tour Finals at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Taylor Fritz of the United States returns to Germany's Alexander Zverev during their semifinal tennis match of the ATP World Tour Finals at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Taylor Fritz of the United States celebrates after winning the ATP World Tour Finals semifinal tennis match against Germany's Alexander Zverevat at the Inalpi Arena in Turin, Italy, Saturday, November 16, 2024. (AP Photo/Antonio Calanni)

Germany's Alexander Zverev returns to Taylor Fritz of the United States during their semifinal tennis match of the ATP World Tour Finals at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Taylor Fritz of the United States celebrates after winning the ATP World Tour Finals semifinal tennis match against Germany's Alexander Zverevat at the Inalpi Arena in Turin, Italy, Saturday, November 16, 2024. (AP Photo/Antonio Calanni)

Taylor Fritz of the United States celebrates after winning the ATP World Tour Finals semifinal tennis match against Germany's Alexander Zverevat at the Inalpi Arena in Turin, Italy, Saturday, November 16, 2024. (AP Photo/Antonio Calanni)