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spin efficiency

Understanding Rapsodo Pitching Data: Spin Rate & Efficiency Profile (Fastball)

In 2019, MLB four-seam fastball spun at roughly 2300 rpms; however, the most effective four-seamers averaged well above that mark. Given the nature of the pitch, maximizing raw spin and spin efficiency is vital. I’ll use a pitcher from a previous article to better illustrate what spin efficiency can do for a true four-seam fastball.  Velocity (mph)  Spin …

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