first, basically, there are 2 serving style in top 10: one is like the roddick's, the other is like the federer's, can you agree with me? i always serve just like federer‘s style, but when i look my vids, i found that after tossing the ball, until it's high enough, then i swing the serve hand. so the result is: i should toss the ball much higher and it's not stabilized! and always i hit the ball when it's drop and i think it's not good so i want to change the style from roger's to roddick's. I noticed that that style save much time that maybe i can get more time before i hit the ball so i can toss the ball much low. so is it a good idea? can you guys give me some instruction? thanks!