Jahmai Jones
111 PA · sample confidence ×0.53 · full player page
Moving against him
In his favor / neutral
1. Plate-discipline erosion — expanding the zone
30%Causal path: Swing decisions → Contact rate → Actual outcomes
- • Chase rate +7.8% vs last season
- • Walk rate −2.1% vs last season
- • Strikeout rate +11.1% vs last season
Against / absent: Zone contact −2.8% vs last season
2. Approach change — selling out for pull-side power
22%Causal path: Swing decisions → Batted-ball profile → Actual outcomes
- • Pull rate +4.1% vs last season
- • Strikeout rate +11.1% vs last season
- • AVG −.137 vs last season
Against / absent: Avg launch angle −6.8° vs last season · Barrel rate −4.0% vs last season
3. Timing issue — late to the ball
21%Causal path: Swing/pitch mechanics → Swing length → Batted-ball profile → Expected outcomes
- • Ground-ball rate +7.1% vs last season
- • Whiff rate +8.2% vs last season
- • Bat speed −0.5 mph vs last season(bat speed intact rules out strength loss)
Against / absent: Opposite-field rate −11.2% vs last season · Avg exit velocity −0.8 mph vs last season · d_timing_late_pct (no data)
Mechanics themselves are unobserved in public data; inferred from the batted-ball fingerprint.
Unexplained / unobserved causes: 27% — confidence is deliberately capped; public data cannot see every layer.
Actions follow the top hypothesis; if video review rejects it, fall to the next.
- • Biomechanics (Hawkeye), TrackMan, and Blast Motion are team-internal — the mechanics layer is inferred from its downstream fingerprint, never observed.