No. 1 / Knuckle curve: Pitches with Extension / 2021
897
Season leader
Player stats
Knuckle curve: Pitches with Extension 2021
Number of pitches with a usable release extension measurement. This is the sample behind average extension. Uses pitches recorded as knuckle curve.
Recorded pitch types. Usage divides by all delivered pitches, including unknown types. Speed is in mph, spin in rpm and extension in feet. Averages use measured pitches only. Whiffs divide misses by swings. Data through December 31, 2021. Data refreshed Sep 9, 2026, 10:11 AM UTC.
- KC ext count
- Number of pitches with a usable release extension measurement. This is the sample behind average extension. Uses pitches recorded as knuckle curve.
Understanding Knuckle curve: Pitches with Extension
Number of pitches with a usable release extension measurement. This is the sample behind average extension. Uses pitches recorded as knuckle curve.
Season rankings use regular-season records. A player has one combined row across teams; the team label identifies the associated team, not a separate team stint.
Source: MLB statistics and MLBDB derived measures. Formulas describe the measure above. Data refreshed Sep 9, 2026, 10:11 AM UTC.