SPECULATOR: In-season pitch changes, 2019

As we all know, in-season pitcher performance comes with peaks and valleys. Sometimes we can chalk it up to simple variance—a hot or cold stretch where command comes or goes, balls find holes at the wrong time, etc. Other times, a tangible change in a pitcher's pitch mix, release point, or velocity might be driving those new levels of performance. It's those "other times" that draw our speculative eye.

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  For more information about the terms used in this article, see our Glossary Primer.