Originally Posted by alidisperanza
Believe it or not, that serve lands on the line and unfortunately gets called out a decent ammt of the time. It's a little unnerving especially when people do it on clay. Taking what you said more liberally, the two serves I usually pull aces on are hitting what some call a "twist" (kick serve that bounces out to the right) on or near the T or the shorter angle out wide (assuming the deuce side).
Playing at 4.0, people are unduly impressed by the speed of the serve and get shaken easily but at 4.5, it's necessary to keep a competitive advantage and give my doubles partner the opportunity to close. More experienced players tend to read my placement serves and are able to return them neutralizing the advantage of the serve. I try to mix it up as often as possible to keep them guessing.
I'm definitely working on it though!
If somebody calls my in serve out on clay, I go up and take a look and ask them to circle the mark.