Spain's Carlos Alcaraz reacts during the singles tennis match of the ATP World Tour Finals against Germany's Alexander Zverev, at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Norway's Casper Ruud returns the ball to Russia's Andrey Rublev during their singles tennis match of the ATP World Tour Finals at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Spain's Carlos Alcaraz lies on the pitch during the singles tennis match of the ATP World Tour Finals against Germany's Alexander Zverev, at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Norway's Casper Ruud returns the ball to Russia's Andrey Rublev during their singles tennis match of the ATP World Tour Finals at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Russia's Andrey Rublev reacts during the singles tennis match of the ATP World Tour Finals against Norway's Casper Ruud, at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Germany's Alexander Zverev returns the ball to Spain's Carlos Alcaraz during their singles tennis match of the ATP World Tour Finals at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Spain's Carlos Alcaraz returns the ball to Germany's Alexander Zverev during their singles tennis match of the ATP World Tour Finals at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Spain's Carlos Alcaraz leaves the pitch at the end of the singles tennis match of the ATP World Tour Finals against Germany's Alexander Zverev, at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Germany's Alexander Zverev celebrates after winning the set point during the singles tennis match of the ATP World Tour Finals against Spain's Carlos Alcaraz, at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Norway's Casper Ruud reacts during a match against Russia's Andrey Rublev at the ATP World Tour Finals tennis tournament in Turin, Italy, Friday, Nov. 15, 2024. (Marco Alpozzi/LaPresse via AP)
Germany's Alexander Zverev celebrates after winning the set point during the singles tennis match of the ATP World Tour Finals against Spain's Carlos Alcaraz, at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)
Spain's Carlos Alcaraz returns the ball to Germany's Alexander Zverev during their singles tennis match of the ATP World Tour Finals at the Inalpi Arena, in Turin, Italy, Friday, Nov. 15, 2024. (AP Photo/Antonio Calanni)