Ha-Seong Kim
82 PA · sample confidence ×0.45 · full player page
Moving against him
In his favor / neutral
1. Plate-discipline erosion — expanding the zone
23%Causal path: Swing decisions → Contact rate → Actual outcomes
- • Chase rate +3.2% vs last season
- • Strikeout rate +6.4% vs last season
- • Zone contact +0.5% vs last season(in-zone contact intact isolates the problem to decisions)
Against / absent: Walk rate +2.6% vs last season
2. Approach change — selling out for pull-side power
23%Causal path: Swing decisions → Batted-ball profile → Actual outcomes
- • Pull rate +4.8% vs last season
- • Avg launch angle +2.8° vs last season
- • Strikeout rate +6.4% vs last season
- • AVG −.166 vs last season
Against / absent: Barrel rate −1.3% vs last season
3. Timing issue — late to the ball
19%Causal path: Swing/pitch mechanics → Swing length → Batted-ball profile → Expected outcomes
- • Ground-ball rate +5.8% vs last season
- • Whiff rate +5.6% vs last season
- • Avg exit velocity −4.5 mph vs last season
- • Bat speed +1.4 mph vs last season(bat speed intact rules out strength loss)
Against / absent: Opposite-field rate +0.0% vs last season · d_timing_late_pct (no data)
Mechanics themselves are unobserved in public data; inferred from the batted-ball fingerprint.
4. Swing got longer — more power intent, more swing-and-miss
18%Causal path: Swing length → Contact rate → Actual outcomes
- • Whiff rate +5.6% vs last season
- • Avg launch angle +2.8° vs last season
- • Pull rate +4.8% vs last season
Against / absent: Swing length +0.07 ft vs last season
Unexplained / unobserved causes: 17% — 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.