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Arm Slots Revisited Matt Lentzner.

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Presentation transcript:

Arm Slots Revisited Matt Lentzner

About Me My main interest is in physical computer simulations. Tried to do a baseball simulation and realized that baseball was not as well understood as I had assumed. Trying to figure this stuff out really caught my interest.

Goal Qualitatively model how arm angles affect pitching

Easy Quiz What pitch is the most basic and elemental in a pitcher’s repertoire? What pitch is typically thrown with the most velocity? What pitch has the most break?

The Fastball The reference point for all pitching because it is the most efficient. Most Velocity Most Spin Least Taxing to Throw Most importantly it is thrown “inline” with the arm. The spin is aligned to the arm slot.

The Thesis Using a horizontal/vertical scatter plot of pitch movement: A line drawn from the origin (0,0) to the fastball cluster will describe the arm slot.

Jonathan Papelbon

Hideki Okajima

Brad Ziegler

All other pitches work off the Fastball Cutter (-3 mph) Fastball (-0 mph) Splitter (-5 mph) Change Up (-9 mph) Slider (-7 mph) Sinker (-3 mph) Change Up (-9 mph) Slurve (-10 mph?) Curve (-13 mph) The Pitching Peanut (high ¾ arm slot)

Is there a practical value to all this?

Pitch Typing without Arm Slots (This only works with high 3/4 arm slots)

How you do Pitch Typing using arm slots Pitch Identification Use the technique in reverse: know ahead of time what the arm slot is and apply the template Even pitchers who don’t throw a in game fastball can still be ID’ed once you know the arm slot

Derek Lowe

Roy Halladay

Josh Beckett

Johan Santana Just Flip the Peanut for Lefties

How to ID Pitches ID the pitch by offset angle Yes No Is it a fastball, sinker, or changeup? Use offset ID Compare pitch speed to determine if a changeup or splitter

Questions?

Spins Fastball Cutter Slider Slurve Curve Sinker

On the plus side we don’t need high precision Estimating Arm Slot from PITCH f/x release points (as opposed to scouting it) Lots of problems Stride Length Posture Position on Rubber (24” wide) Listed heights (which imply arm length) are not accurate (especially for vertically challenged players) On the plus side we don’t need high precision

Jonathan Papelbon 6’4”

Brad Ziegler 6’4”