Performance psychology involves the process of facilitating the development of skills necessary for the performer during their time to shine in a performance. Additionally, the process is almost entirely tied to the events preceding the performance since they provide the foundation for the desired outcome. This preparation involves not only physical practice, but also mental, psychological, spiritual and emotional practice. In fact, the physical aspect of a performance is much less important than the mental and spiritual aspects. Tennis is a perfect example. No matter how much a player practices, if facing a match the player becomes too nervous, his whole body will freeze and make unforced errors very easily. This happened quite often at the start of my matches until I managed to train my mind to stay focused on the game rather than winning. I also remember reading a book about tennis when I was about 8 years old, and there was a question that said something like: "How technical, tactical, physical and is a tennis match mental ? and several professional players responded by saying that the mental part contributes to almost the entire game. At first, since I had never experienced a real difficult match before, I was like, "No, that's not good." It's 25% each. This makes sense; It’s mathematics.” Looking back, I realize how stupid my comment was because I had no idea what a real performance was, and that the physical aspect although important, is more relevant in preparing for a match. Any performance is made up of various smaller elements that each contribute to an overall picture, just like a piece of a puzzle; however, each has a unique slot that no other piece can fill. The variables that affect performance can be mainly classified into three main areas: active motor, affective and cognitive. Some variables are internal, while others are external. Externalities, or external factors that affect performance, vary from one situation to another; nevertheless, they must be dealt with somehow, so that the show can go on. The active motor domain is that which is involved in the physical aspect of a performance; in tennis, this refers to the practice of all the shots that exist; synchronize the bend of the knees with the correct angle for a swing and hit the ball in a certain way (for example: with lift, flat, slice); as well as doing conditioning exercises to increase physical strength and endurance. The affective domain is that involved in the emotional, mental and spiritual aspect of a performance. In tennis, how a player prepares in these areas depends solely on their style. I usually use self-talk and tell myself that I'm going to play well and I'm going to have fun; I also completely distract myself from tennis by doing something productive like homework for example so I don't think too much about the match which would exhaust my mind, but I also do something that asks my mind to focus on one thing. . In fact, I'm writing this article right now as I have a match in 5 hours. The cognitive domain is that involved in the neurobiological aspect of a performance, or in the changes that occur in the body due to other variables. In order to manage this area, the player must manage the variable that causes the change in the body. For example, if during a match I start to feel very tense and sweating due to nervousness, I may discover that instead of using positive self-talk, I let my mind worry.