Problem when serving

Hi,

when I am trying to do a heavy sidespin serve(the ball would curve a little before going straight or the ball would curve back as though it is a ma lin serve), the ball would either bounce on my side only or on my opponent's one only.What's wrong and how do I improve?

Hi Hao,

This is just a step in the process of getting the serve right.  Keep working on getting the feel of the contact.  You are on the right track if you are getting the ball to curve and spin back.