why roger in one match অথবা one tournament অথবা one season theres adifference in his play good অথবা imaginatively অথবা bad অথবা as amateaur idont know???

Because he is human, not a robot. That is one of the reasons why it is so great to watch him. Most of his greatness has already been achieved দ্বারা being trained and human. Not a machine. His technique is fabulous-like no one else.