Why does Pau Gasol blow into his hands?

Answer 1

Blowing on the fingers dries them off a bit. It will result in a marginally better grip on the racquet. They can't really wipe their hands on their shirt or shorts - their clothing is damp with sweat. It's either that or call for a towel from one of the courtside assistants.

Answer 2

Because bouncing the ball with such pressure causes a tingly sensation not to mention the nervousness of the game makes them sweaty so blowing on the hand makes it easier to grasp the ball and play the game

Answer 3

Because he always tries to keep his hands sweaty to grip the ball better.