The relationship between a catcher’s framing skill and the likelihood of getting a borderline pitch called a strike has long been a point of discussion among analysts and coaches. Recent work using Statcast’s granular tracking has moved the conversation from anecdote to measurable pattern.
By segmenting catchers according to where they excel or struggle to convert framing attempts into strikes, the study mapped each player’s success rate when they elect to challenge an umpire’s call. The results show a clear inverse correlation: the poorer a catcher’s framing in a particular zone, the more often his challenges succeed there.
This counter‑intuitive trend appears to stem from a combination of pitch selection and confidence. When a catcher is weaker at framing in a given area, the pitches that land there are often more marginal, giving the catcher a better chance to argue that the ball was actually a strike. In those situations, the catcher may also feel more justified in pushing for a reversal, leading to a higher conversion rate.
Glove‑Side Dominance
Across the league, catchers consistently post higher success rates on their glove side compared with the arm side. The disparity is modest but persistent, suggesting that the natural angle of the glove hand provides a subtle advantage when framing and when subsequently challenging a call.
The data also indicates that challenge locations tend to cluster near the center of the plate in zones where framing is weakest. Interestingly, the success rates for challenges aimed at the top and bottom of the strike zone are almost identical, underscoring that the key factor is not vertical placement but the catcher’s framing proficiency in that region.
Given these insights, the recommendation for catchers is straightforward: embrace the zones where framing is a weakness and use them as focal points for challenge attempts. By doing so, they can convert more borderline pitches into strikes, adding value beyond the traditional defensive metrics.