Z-Swing%
Share of pitches inside the strike zone the hitter swung at.
What Z-Swing% means
The other half of plate discipline: taking strikes is as costly as chasing balls. League average sits near 68%. Elite hitters pair a high Z-Swing% with a low chase rate.
What counts as a good Z-Swing%
Higher is better — roughly 62 is poor, 68 average, 72 good, and 76 or better elite.
Also written
z_swing · zone_swing_pct
Source
Statcast