Originally Posted by woodrow1029
I do agree with you for calling an official once the match started, and I don't think that is gamesmanship at all. I do see, however, that someone could see it as gamesmanship when you warn them about it during the warm-up (trying to get into their head), although I'm not in any way saying that is what your intention was. Even a lot of pros foot fault during the warm-up, and I don't think you really are in a position to say anything to them in the warm-up. At that time, you don't know what they are going to do during the match.
Yep, there is plenty of video around of Federer hitting practice/warmup serves, and stepping inside the line.