i know the discussion has focused on the effect of "hitting the ball as hard as you can" has on the ball, but what effect, over time, will it have on your body? if you are exerting yourself to your absolute maximum, theres a chance you may not be able to enjoy playing tennis as long as possible. its just something to think about i suppose. you may have to adapt your game as you get older in order to continue to enjoy playing tennis.
You will burn yourself out in the timeframe of the match.