Every player has defining characteristics. From their serve to their footwork to their backhand, a lot of players can, visually, be identified because no two people play the same. The ATP wanted to see what happens when you have to guess a player from just their grunt.

ATP stars, including Alexander Zverev, Andrey Rublev, Steve Johnson, Kyle Edmund and Jeremy Chardy, attempted just that, listening only to the grunts of their fellow players. Some of them were easy, such as Rafael Nadal's signature grunt, but others were way harder, such as Rublev, who doesn't really have a signature grunt.

In the end, Zverev managed to guess all six grunts correctly, earning first place, while Rublev only got two right.