The Italian tennis player had to allow the German number 3 in the world several break points in front of his own audience in Turin, but cleared them all. The four-time Grand Slam champion struck at the right moments: 6-4 6-3.
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Sinner (24) had enough breaks at the end of the first set and in the sixth game of the second set to win. The Italian previously defeated Félix Auger-Aliassime, Zverev defeated Ben Shelton. Zverev still has to secure his last semi-final place in the last group match with Auger-Aliassime, Sinner will meet Shelton.
Sinner won the year-end tournament last year by beating American Taylor Fritz in the final.
Auger-Aliassime beats Shelton in an exciting three-setter
Félix Auger-Aliassime has recorded his first victory at the ATP Finals in Turin. The 25-year-old Canadian defeated the American Ben Shelton in three sets: 4-6 7-6 (7) 7-5.
Shelton, number 5 in the world rankings, lost his first match to the German Alexander Zverev. Auger-Aliassime, who is ranked eighth in the ATP rankings, started with a defeat against defending champion Jannik Sinner.