Novak Djokovic beats Rublev to reach ATP Finals semifinals


              Britain's Cameron Norrie returns the ball to Norways' Casper Ruud during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
            
              Norways' Casper Ruud celebrates after defeating Britain's Cameron Norrie during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
            
              Russia's Andrey Rublev serves a ball to Serbia's Novak Djokovic during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
            
              Serbia's Novak Djokovic celebrates after defeating Russia's Andrey Rublev during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
            
              Serbia's Novak Djokovic celebrates after defeating Russia's Andrey Rublev during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
            
              Serbia's Novak Djokovic celebrates after defeating Russia's Andrey Rublev during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
            
              Serbia's Novak Djokovic celebrates after defeating Russia's Andrey Rublev during their ATP World Tour Finals singles tennis match, at the Pala Alpitour in Turin, Wednesday, Nov. 17, 2021. (AP Photo/Luca Bruno)
Novak Djokovic beats Rublev to reach ATP Finals semifinals