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Descriptive only — a measured pattern, no edge claimed.
Analytics module · as of 2026-07-25

MLB Count Leverage

Fall behind 3-0 and the pitcher almost always reaches for the heater: on a 3-0 count a four-seam fastball is the pitch 65.12% of the time, thrown in the strike zone 62.93% of the time.
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confirmednull (a finding)not testabledescriptivepending
Mlb Count Leverage
Chart: Mlb Count Leverage -- Fall behind 3-0 and the pitcher almost always reaches for the heater: on a 3-0 count a four-seam fastball is the pitch 65.12% of the time, thrown in the strike zone 62.93% of the time.
scripts/platformkit/analytics_showcase/out/mlb_count_leverage.json2026-07-25

What it means

Count state strongly shapes what gets thrown. In a must-throw-a-strike 3-0 hole the four-seam share (65.12%) roughly doubles its ~30% share in even and ahead counts, and the in-zone rate climbs because the hitter usually is not swinging. As the pitcher gets ahead the mix broadens toward sliders and changeups and the in-zone rate drops.

Caveats & confounds

DESCRIPTIVE_ONLY over the local 2025 Statcast pull; the type==S strike rate conflates called, swinging and foul strikes (no per-pitch swing/take in this corpus). Not a predictor; no edge or ROI claim.

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