Originally Posted by NLBwell
Interesting that the difference between first and second serves was similar no matter what the level of the player. One of the reasons my serve is so effective is the multiple speeds at which I hit. I pride myself on how slowly I can hit an effective serve - almost all the energy going into spin. Combining that with the flat heater and the many other types of serves I hit is very effective.
Mixing up speeds can be as useful a tool as mixing up placement and spin.
Yes, for sure. Serving is like baseball pitching. Other than the freaks with inordinately fast serves (pitches), the most effective are those who vary speed and placement in such a way that it's a continual challenge for the receiver (batter) to anticipate what's coming and where it will be coming to.