During his 2nd round match against Nikoloz Basilashvili at the ATP Shanghai Masters on Wednesday, he saw many such moments.
Shanghai fourth seed Zverev, who departed the Beijing hardcourts by smashing his racquet, kept his cool this time to defeat on-form Basilashvili 7-5, 6-4 in 92 cagey minutes.
After smashing a backhand victor in the first set, Zverev raised his fist and roared - terrifying the nearby ballkid, who was jolted backwards and popped out his eyes while the German approached.
Zverev was too strong for Australian Alex De Minaur, coming through 6-1 6-4 in just over an hour to reach his sixth Masters quarter-final of the year but first in Shanghai. "In the third set I really started to figure it out, as well, how aggressive or how tactical I wanted to make the match".
He'll now take on the victor of the late match between Juan Martin del Potro and Borna Coric for a spot in the last four.
"I played alright", Zverev assessed.
He further added, "you don't want to have them leave feeling like, oh my god, like I was not appreciated or I was not liked or it was actually a disgusting thing, you know?"
"I'm happy to have a tough match behind my back and now looking forward to what the tournament holds for me now". I did everything that I needed to win; focused a lot-focused on my game.
"He knows how to play, definitely", proclaimed Zverev, who was clearly very relieved to have gotten through the game, progressing into the next round with the likes of Roger Federer and Novak Djokovic.