variation

I've been playing for a few years now and I've noticed that during my matches I sometimes get in the habit of using a few serves during a match. The closer the score, the fewer serves I feel comfortable with using as I don't want service errors. Is it good to have a particular go to serve or...

Update1: A slow motion video of my version of Ma long's all serve variations Hello everyone, Ma long uses heavy backspin serve at critical moments of the game by catching his opponents of guard with those serves. This is an inspired video. However, I have to state that my contact is little...