Originally Posted by tennis tom
Yes you need to allow your opponent to warm-up his volleys and OH's. That is an important aspect of the game, even if he's a baseliner, what if your shots fall short and he has to hit an approach and a volley or an OH. In a tournament you have anywhere from 5, 7 to 10 minutes to warm-up. If there's an official around they will give you a two minute warning to warm-up serves, you should take warm-up serves from the add and the deuce side.
So YES, if you don't want to tell him, but let him warm-up according to the traditional method--there's a reason for everything in tennis including the warm-up. Not following the tradition marks you as an amateur, possibly a weirdo and you won't be asked back again.
This is tennis, not the x-games.
We get a 5 minute warm up here, so for the last 2 minutes I let my opponent warm up some extra serves. My shoulder isn't in the shape where I can just hit serves after a 3 minute warm up.