flat serve pronation (Andy Murray vs. Roddick & Sampras)

[aptennis91]

I was just looking at some serve clips and I saw that pros have very different pronation in flat serves.
http://www.youtube.com/watch?v=eiH-t..._embedded#t=37
This is Andy Murray and notice how his arm comes straight down with the wrist snap.
Then you look at Roddick.
http://www.youtube.com/watch?v=91IxRV4RDt8
The racquet pronates further outward after the hit and finishes at the side of the body.
I noticed Sampras does the same thing forming a V with the elbow.
http://www.youtube.com/watch?v=ABB0s2cT75g
Why is this?? What are the different results??

[ms87]

Murray's technique tends to be simpler than others'. His forehand and backhand are also considerably simpler than those of his contemporaries.

That V shape is the result of high racquet head speed and pronation. You see the same thing in Federer's serve, Djokovic's serve, etc - basically almost all other pros, particularly the big serving ones. I think any of them are better models for serving than Murray.

[LES]

Originally Posted by ms87

Murray's technique tends to be simpler than others'. His forehand and backhand are also considerably simpler than those of his contemporaries.

That V shape is the result of high racquet head speed and pronation. You see the same thing in Federer's serve, Djokovic's serve, etc - basically almost all other pros, particularly the big serving ones. I think any of them are better models for serving than Murray.

What? Neither Federer or Roddick have a sharp V elbow bend