Bye bye," Zverev's gesture to a spectator after his win against Popyrin

Zverev secured a victory in the quarterfinals of Toronto against defending champion Popyrin. After losing the first set, the German turned the match around to defeat the Australian in three sets (6-7, 6-4, 6-3).

While the match was intense, an incident occurred as the world No. 3 was serving for the win. Indeed, a spectator repeatedly provoked the 28-year-old player as he began serving at 5-4, 30-15 in the third set.

The situation clearly irritated Zverev, who didn’t hesitate to make it known after match point. Following his victory, he turned to the spectator and said, "Bye bye," accompanied by a hand gesture.

This isn’t the first time the German has shown frustration toward the crowd. Earlier this year in Buenos Aires, the three-time Grand Slam finalist had criticized the Argentine audience, stating that "they don’t know how to behave.