The smash at the grid is the perfect smash to create doubt about the trajectory of the ball when the opponent left is climbing to the net and finds himself in the middle of the field. The goal is to play in the feet in the direction of the grid so that the opponent has no idea of anticipation of the trajectory of the ball. By playing the smash at the grid the rival will not come to volley the smash and even less be in good conditions to counter you.
The best ball to go to the grid is when the opponent on the left lobes you very close to your grid or the side window. This ball is most conducive to smasher the grid because the player must absolutely position themselves under the ball to be able to lift the ball perfectly and aim the grid. The most important thing is to control the speed of the smash, so feel free to vary the speeds.
The best examples for performing a smash grid are Paquito Navarro and Pablo Lima. Do not hesitate to imitate them.