[BerntR]

Tournament rounds are the best rounds there is.

Play your own game
Prepare as you usually do before playing a round.

This is not the time to invent new warm-up routines or new game plans.

Have realistic expectations. Or even better: Don't have any expectations.

Be target oriented. Use whatever works right there, right now. (as opposed to technique oriented)

And perhaps one of the few things you really can control: Be focused and concentrated and positive on EVERY shot. If you do that, you can be proud of yourself afterwords regardless of the result.

Have fun.
Enjoy the company.