Practice good posture—head up and shoulders back.
Employ a confident walk.
After the point is finished, put your racquet in your nondominant
hand. This allows your hand to rest and relax, and more often than not you won’t be tempted to use or abuse your racquet
in frustration.
Smile and enjoy the match.
Manage the time between points effectively. If the momentum
is on your side, keep the flow of the match moving. If you’re making mistakes and in trouble, slow down, take some deep
breaths, and have a clear plan for the next point.
Use the same routine before every serve. Make sure you bounce
the ball a few times and visualize the serve you want to hit.