Originally Posted by BobFL
OP, that happens when you: a) muscle the ball/serve; 2) are not fluid and c) both a and b
I know this from personal experience. I was practicing a lot and now I am ok...
Yes I completely accept, It happened when I played against an opponent who was praising the pace in my serve. Hence I stretched hard to muscle the ball. Now I am not in a position to apply any muscle to my serve. My slice serve is more fluid and it does not hurt because the pace comes from the smooth action rather than arm power.