you know nothing about serves you just watch TV...and are like wow that's nice one...lol...
Let's review some of the characteristics that separate Roddick from the rest of the pack.
Roddick uses a delayed double cocking action that none of the other servers have.
Roddick has perfect 90-degree knee flexion.
Roddick coils less than the other servers during his preparation phase which allows him to more easily uncoil and utilize the kinetic chain more efficiently.
Roddick, by far, uses his legs more effectively than any other server to explode into impact.
Roddick is the only server here who completely uncoils his body by contact. He is square to the ball at impact which means he fully utilizes all of his kinetic chain and kinetic energy at impact.
Roddick is the only player who has his torso completely extended at contact with less trunk tilt than the other demonstrated servers.
Unlike the other servers, Roddick uses his tossing arm during the preparation phase to stretch his abdominal region allowing him to fire the core muscle group more explosively.
This is take from Tennisone.com and an article on the best servers and why Andy's is the best.
mmmhhhkkk so go back elsewhere!