Why does Roddick look like a blowfish

[uspta2331024484]

Why does Roddick look like Dizzy Gillespie when he is about to hit the ball? Does he have a different way of breathing than other players?

[backhand]

Easier to see when watching Roddick live, but he also often does the "blowfish" when his opponent strikes the ball.

[bottle]

Transformation

I noticed that the beautiful Gabriela Sabatini also
transformed into a blowfish when hitting her backhand.
Well, the backhand then became beautiful, so I guess
it was all right.