Often you will be playing the winner of a match that is in progress so it is an excellent opportunity to sit down and watch that match to scout both players. This is also the time to write in your tournament notebook which you have just started. In it you will record all your results as well as thoughts regarding each match. This way if you play an opponent again six months down the road, you can look in your book and come up with a strategy. If you have more than an hour between matches it is a good idea to get away from the club for a while.
Tennis tournaments are notorious for their tremendous amount of dead time.
The last thing you want to do is go out onto the court after sitting in the lobby of the club for two hours getting physically stiff and mentally stale. If you lose your first match don't despair, be proud of yourself. Be objective and try to figure out what you did well and what you need to work on. Write it down in your notebook and show it to your club pro when you get home. This will give you something to work on in order to prepare for your next tournament.