RESEARCH: First-pitch strike rates of starting pitchers

Our research in 2013 on swinging strike rates (SwK%) illustrated the strong correlation between a pitcher’s level of swinging strikes and one of the staple pitching metrics we have used for years—Dominance (K/9) rate. SwK% is a metric often used today to validate strikeout levels and to forecast the potential for a pitcher to experience a surge or decline in strikeouts.

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