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Italy's Jannik Sinner returns to Norway's Casper Ruud 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)

Italy's Jannik Sinner returns to Norway's Casper Ruud 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)

Italy's Jannik Sinner reacts during a semifinal tennis match of the ATP World Tour Finals against Norway's Casper Ruud at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Italy's Jannik Sinner reacts during a semifinal tennis match of the ATP World Tour Finals against Norway's Casper Ruud 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 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)

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 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)

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 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)

Italy's Jannik Sinner reacts after winning during the semifinal tennis match of the ATP World Tour Finals against Norway's Casper Ruud at the Inalpi Arena in Turin, Italy, Saturday, November 16, 2024. (AP Photo/Antonio Calanni)

Italy's Jannik Sinner reacts after winning during the semifinal tennis match of the ATP World Tour Finals against Norway's Casper Ruud 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)

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 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 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)

Norway's Casper Ruud reacts during a semifinal tennis match of the ATP World Tour Finals against Italy's Jannik Sinner at the Inalpi Arena in Turin, Italy, Saturday, Nov. 16, 2024. (AP Photo/Antonio Calanni)

Norway's Casper Ruud reacts during a semifinal tennis match of the ATP World Tour Finals against Italy's Jannik Sinner 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)