Coping with mistakes is one of the toughest challenges in the game. If you can rise to and eventually overcome this challenge then you will be one of the best.It is okay to be angry and annoyed about mistakes but the key is to find a way of coping and dealing with that anger so that you can come back and fight for the next point.All the top players experience the same feelings and emotions. The only difference is that through experience and hard work most of them have got better at dealing with them. Decide who your role model is going to be. How do you want to react when the going gets tough?
It is easy to have a tantrum, throw your racket and then lose the match, are you tough enough to react to these situations and take on the challenge?
This process may take you some time to perfect but as you get used to it, you will find that the process of calming down doesn't take so long.
After a while you may find that simply turning your back on the court and switching the racket into your non-racket hand will be enough.
Remember though, you can't hold up play so need to be ready to serve or return serve within the legal time allowed between points.