RESEARCH: Pitch type benefits—Runners on base

How do new pitches affect how we evaluate pitchers?

Few pitchers can log game after game, season after season, and achieve the same level of success by doing the same things over and over again. Old dogs can learn new tricks, but even the young pups are doing so these days.

39 different pitchers have been identified either via interview or PITCHf/x data as working on new pitches. As these pitchers work on adding new pitches, we need to examine what kind of effect the change has on their overall production as well as league-wide production. If certain pitch types have lower hit rates or batting averages against, should we be targeting pitchers that increase the frequency of those pitches? Or does it all balance out in the end?

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