STARTERS: BPV none on/runners on, 2019

Our original research in 2013 confirmed that there are significant skill differences among pitchers when throwing with the bases empty compared to with runners on base.

This trend continues to hold true. Pitchers have produced a near-100 BPV in each of the last five seasons with the bases empty, compared to a mediocre sub-70 BPV when pitching with runners on base.

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