Varying serves

Hi Alois, hi Jeff,

Assuming that I have a serve which works well against a particular oppononent: would you repeat that serve until he/she finds out how to deal with it?

Or would you try different serves in between?

I was criticized for doing the latter. My team-mates said: "Why didn't you simply do the same serve over and over?"

Hi Claus,

I like players to do the serve often.  If there is a serve that the other player doesn't like they aren't going to get a lot better at returning it during a match.  If you think of it from the reverse point of view, if I am receiving and the other player has a serve I don't like, I don't want him to serve it this serve or the next or the next.  I would much rather he changes serve and keeps me in the match. 

If you do the serve often then perhaps the match won't get to a close situation.

You can change it up sometimes but I would do it 8 out of 10 serves at least.