Throwing a Cutter like Mariano Rivera
Mariano is the undisputed king of the cutter. The reason his cutter is so good, & fools the best of hitters, is that the swing of the ball takes place late; and hence, the hitter has almost no time to interpret this. His secret is in the snap of his wrist at the time of release. Of course, just by snapping your wrist, you won't master the pitch like Rivera.