You’ll see fastballs classified all number of ways, considering that pitchers throw a wide variety of pitches that are all 90-ish MPH and have similar movements. These movement plots are based around a hypothetical pitch that has absolutely no spin, so when a pitch breaks “up”, it means that it does not fall as much on the way to the plate as a spin-neutral pitch would.įS / SI / SF = fastball (sinker, split-fingered) Also, pitches obviously don’t break “up” - gravity pulls every pitch down as it approaches the plate. Note: these charts are presented from the catcher’s point of view. Here’s a sample movement chart for a right-handed pitcher (for left-handed pitchers, just imagine the mirror image of this chart). That said, pitches tend to move in the same general way in comparison with one another, so it’s relatively easy to take a glance at a pitcher’s movement chart and tell what sort of pitches they throw. Roy Halladay’s two-seam fastball may move in a particular way in relation to his four-seam fastball, but that doesn’t mean all pitchers have similar movement patterns every pitcher is unique. Each pitcher has a slightly different grip and arm action for their pitches, so the same pitches can technically look quite different depending on the pitcher. Classifying pitches is more of an art form than a hard science.
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