I think it's an aligning of the stars situation. My mental state and physical state line up in such a way where I am allowed to proficiently facilitate finer details of the game like tracking the ball, anticipating my opponents move, moving my body accurately in preparation and carrying out my practiced techniques with efficiently, etc. In a way I think it's kind of like getting lucky, but people who set themselves up for success are more likely to benefit from luck than those who are unprepared.