Originally Posted by tennis tom
You've already warmed up or should have long before any serious competitive match. The pros "warm-up" for an hour or two long before the so-called beginning of the match "warm-up". Stick with the traditional warm-up routine and things will go much better if you're playing against a real player--if you're not it really won't matter because he won't know any better either. If you need to "practice" or warm-up your shoulder, hit your serves on a practice court before your match. If it's a casual match, arrange with your opponent that you want to practice your serve for a while and maybe he can practice his returns.
Very True and great advice. But you wonder how much of the ball striking is psychological. Agassi started a trend late in his career to do a very short or no warmup before matches..The theory is that an older pro's strokes are so grooved by 30+ that they try to conserve their energy.