Glossary Section
Pitching Metrics
Stuff
Stuff measures the physical quality of a pitcher’s arsenal. It centers on velocity, movement, extension, and whiff ability rather than just the final line.
PermalinkCommand
Command tracks how well a pitcher controls the zone and the edges around it. Strike rate, chase rate, edge rate, and CSW% help show whether a pitcher was actually dictating plate appearances.
PermalinkDeception
Deception looks at how well pitches play off each other. Tunnel score, pitch-pair separation, and release consistency help explain why hitters may have had trouble identifying the ball early.
PermalinkContact Quality
Contact Quality captures the kind of contact a pitcher allowed. Hard-hit rate, barrel rate, exit velocity, and xwOBA help separate loud contact from weakly hit balls.
PermalinkUsage Shift
Usage Shift compares that game’s pitch mix to the pitcher’s baseline mix. It highlights when a pitcher leaned more heavily on one pitch or de-emphasized another.
PermalinkPitch Shape
Pitch Shape visualizes horizontal and induced vertical break by pitch type. It shows how each pitch moves relative to the others in the arsenal.
PermalinkLocation
The location panel plots where pitches crossed the plate relative to the strike zone. It helps connect command, chase generation, and contact outcomes to pitch placement.
PermalinkTunnel Score / Tunnel Quality
Tunnel quality is a custom deception readout that rewards pitches that begin similarly but finish differently. Higher scores suggest a pitch pair played well together out of the hand.
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