It is known as the chopper grip, because it is the way you would hold an axe. It allows you to swing the racket head faster when serving, which is how to generate power and create spin. To find the ...
Novak Djokovic recently showcased his competitive spirit while doing the racquet grip challenge and outdid Grigor Dimitrov.
The simplest way to form the doubled-handed grip is to hold the racket with your dominant hand in the shake-hands forehand grip, then add the other hand with another forehand grip.