Behind in the Count and High Fastball Rates
I’ve started my 2020 draft prep (i.e. writing player previews) and thought I had all the information I needed. I was missing some useful pitcher information, a pitcher’s high fastball rate and how often they are behind in the count. The two measures aren’t publicly available, but they are useful to help see why a pitcher’s overall profile is off. I’m going to rehash each stat and go over some leaders and laggards.
Ahead and Behind in the Count
Being ahead or behind in the count means more than strikeouts and walks. In the original research article at BaseballHQ ($$), I found that pitchers who are consistently ahead in the count limit hard contact. The theory goes that if ahead in the count, all a pitcher’s pitches are can be thrown. If behind, the pitcher may only have one or two pitches he can throw over the plate for strikes and the batter can wait and crush them.
First, I found being ahead or behind is sticky from season to season (i.e. predictable). It has about the same year-to-year correlation as strikeouts and groundballs. The key threshold I found was being ahead 50% of the time more than being behind. On average, these pitchers post a lower than average home run rate and have an ERA lower than their FIP and xFIP. For those pitchers constantly behind, their production drop doesn’t warrant any action.
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