![]() *Note-Left Handed Pitchers would still be at 12:00 for over the top, ¾ slot would be more 10:30, and side-arm at 9:00. The closer to 12:00, the more the ball will use backspin and defy gravity. You can look at is as a clock, with a right-handed pitcher throwing over the top being 12:00, ¾ slot would be more 1:30, and side-arm at 3:00. Spin axis tells us what direction the spin is traveling from a pitcher’s point of view. Anything less than that would be considered cutting the ball and not a true fastball. The goal is to get the fastball to at least 95% spin efficiency.Spin efficiency tells us the amount of total spin being used to generate movement. The only correlation to be seen across the board is that as the pitcher increases velocity, spin rate will increase as well. For the most part, it seems raw spin rate is pretty individualized. Spin rate is the total spin imparted on the baseball by the pitcher. Spin rate, spin efficiency, and spin axis all play vital roles in optimizing the fastball, so we’ll do a quick little overview before diving into each one independently. Every other pitch will inevitably play off the fastball and the better your fastball is, the better the other pitches will play. Prioritizing fastball optimization will always be the first thing we attack during the pitch design process. For Part 2, we will dive into optimizing a pitcher’s fastball. During Part 1, we discussed the basics of pitch design.
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