What Is Framing
Framing is a catching technique where the catcher manipulates the mitt to make balls appear as strikes. Since umpire calls depend on human eyesight, it has long been empirically known that mitt position and movement at the moment of catching influence calls. However, quantitative evaluation of this skill only began in the 2010s. In MLB, the introduction of PITCHf/x and Statcast enabled comparison of actual pitch trajectories with umpire calls, clearly revealing differences in framing ability among catchers. Elite framing catchers can 'earn' 15-20 extra strikes per year, equivalent in value to approximately two home runs. In NPB, TrackMan installation has progressed, and serious quantification of framing began in the 2020s.
Framing Evaluation in NPB as of the 2020s
Since around 2019, TrackMan has been installed in all NPB stadiums, enabling accumulation of pitch data. This allows compilation of umpire call rates on borderline pitches by catcher. Progressive teams have begun incorporating this data into catcher evaluations. SoftBank's Takuya Kai is known as one of the catchers with high framing ability. His catching is praised for 'minimal mitt movement,' with high strike call rates on borderline pitches. However, NPB framing evaluation still faces challenges. Large individual differences in umpire strike zones and environmental variations between stadiums make analysis less precise than in MLB. Additionally, overemphasis on framing risks alienating umpires if catchers obviously pull the mitt after catching.
Framing's Impact on Game Outcomes
Understanding framing's value requires considering how a single strike-or-ball call affects a game. There is a significant difference in batting average between 1-1 and 1-2 counts, and whether a borderline pitch is called a strike or ball can dramatically change the at-bat outcome. Statistically, one strike is worth approximately 0.13 runs. A catcher who earns 100 extra strikes through framing over a season contributes approximately 13 runs. Over NPB's 143-game season, 13 runs equates to roughly 1.3 wins. This is not a trivial number and can be decisive in late-season pennant races decided by a single game. Framing has been undervalued precisely because it is an 'invisible skill,' but data visualization is bringing recognition of its true worth.
Books on baseball data analysis are also helpful
Framing in the Robot Umpire Era
The Automated Ball-Strike system (ABS) has the potential to fundamentally eliminate framing's value. MLB expanded ABS testing in minor leagues from 2024, with future major league implementation in sight. If ABS is adopted, subjective umpire calls disappear, reducing framing's value to zero. ABS introduction is also discussed in NPB, but the traditional view that 'umpire calls are part of baseball' remains strong, making the timeline uncertain. If ABS were implemented, the skill set required of catchers would change dramatically. Effort previously devoted to framing would shift to blocking, throwing, and pitch-calling precision. Framing is a technique that retains value as long as human umpires exist, but whose lifespan is determined by technological advancement - a rare characteristic in baseball history.
The Mechanical Principles of Framing Technique
Framing is not simply about moving the mitt. The core of elite framing lies in stilling the mitt at the moment of catch. When receiving a pitch near the strike zone border, the catcher softens the catch by presenting the mitt toward the pitch trajectory, keeping the catch point inside the zone. The key is not 'pulling' but 'sticking.' It is executed through subtle wrist angle adjustments rather than full arm movement, while maintaining a stable center axis. Video analysis of catchers highly rated in MLB such as Jose Molina and Jeff Mathis reveals a common trait: extremely minimal mitt displacement before and after the catch. The action of predicting the pitch location and pre-positioning the mitt during the approximately 0.4 seconds from release to catch enables high-precision framing.
The Relationship Between Catcher Physique and Framing
A correlation between framing ability and a catcher's physical characteristics has been noted. According to MLB data analysis, shorter catchers tend to have better framing metrics. Setting up from a lower eye level allows them to naturally receive pitches near the bottom of the strike zone within the zone. Additionally, catchers with flexible wrists and wide scapular range of motion have greater freedom in mitt manipulation during catches. Conversely, physically larger catchers have advantages in blocking and throwing, requiring teams to make strategic decisions between framing-focused and all-around approaches. In NPB, catchers around 170 cm tall with excellent framing like Takuya Kai are valued, while many teams also deploy larger catchers with offensive power. The evaluation axis for catchers is not one-dimensional, and optimal deployment depends on team strategy and pitching staff characteristics.
Framing's Role in Pitcher-Catcher Communication
Framing is not a solo catcher skill but is built upon the trust relationship within the battery. For a pitcher, a stable catcher's mitt directly translates to throwing comfort. When a pitcher has confidence that borderline pitches will be securely received, they can attack the corners with conviction. Conversely, a catcher whose mitt moves significantly creates anxiety for pitchers about throwing to the intended target. In NPB, pitchers often express the subjective evaluation that 'my pitches have more life when throwing to that catcher,' which can be understood as a compound effect of framing-based call acquisition and psychological stability. Joint practice during spring training and bullpen sessions before games between battery partners further refine framing precision. Only when both skill and trust align does framing achieve maximum effectiveness in games.