The German won his 15th consecutive match on Monday, defeating Jannik Sinner 6-4, 6-4, 7-6 to reach the US Open quarter-finals.
Zverev, who triumphed at the Nitto ATP Finals in 2018 and made his first major final in New York last year, is in the best form of his career.
And against a dangerous foe in 13th seed Sinner, who beat Zverev at Roland Garros last year, he saved five set points in the third set to emerge victorious inside Arthur Ashe Stadium after two hours and 25 minutes.
“Players with confidence who have played a lot of matches usually know what to do in these situations,” Zverev said in his on-court interview.
In the third round, Zverev raved about the level Jack Sock played in the first set of their clash before the American eventually retired due to an upper right leg injury.
And after the German saved the final set point he faced with an ace, he was able to complete his victory in straight sets when Sinner missed an inside-out forehand into the net.
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