Nervousness

The main reason that players don´t perform well in games is nervousness, and the main cause of nervousness is lack of self confidence. You have to believe that you can play with the people on the court and not get intimidated. You must believe that no one on the court is better than you. Have a good attitude. Believe in yourself and just know in your mind that you have put in the work during practice to be successful in a game situation.