Negative Differences in K-BB% with Men on Base: Alex Cobb
Chris Cwik’s piece on Tyler Skaggs and the tough times the southpaw has endured while men are on base prompted me to wonder about that aspect of pitching. Which hurlers have performed differently, at least in terms of some typically advanced statistics, after hitters have reached base? What might we ascertain from what we discover?
Generally, when a pitcher pitches while men are on base, we assume that he works from the stretch. Therefore, if a starter is considerably less effective after a hitter has reached base against him, we may hypothesize that the hurler struggles while he pitches from the stretch. However, that isn’t necessarily true, because the pitcher may do things such as change his pitch mix in order to achieve a different type of result against a future hitter. Still, we can begin to make conjectures.