Originally Posted by leng jai
Personally I like Haas' serving action a lot, simple but elegant. Federer's and Safin's are also nice actions. At least they are unique, unlike a lot of the generic styles that are coming up these days. Also, I hate Roddick's serve, its all arm and nothing else.
Federer has the most fluent action.
Safin's is effective but places stress on the back.
Haas's service motion is quite heavy-handed.