No. 1 / Knuckleball: Pitches with Spin / 2021
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Season leader
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Knuckleball: Pitches with Spin 2021
Number of pitches with a usable spin measurement. This is the sample behind average spin. Uses pitches recorded as knuckleball.
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.
| # | Player | Team | KN spin count |
|---|---|---|---|
| 1 |  M. JannisMickey Jannis |  BAL | |
| 2 |  L. MaileLuke Maile |  MIL | |
| 3 |  A. MorejonAdrian Morejon |  SD | |
| 4 |  A. BlandinoAlex Blandino |  CIN |
- KN spin count
- Number of pitches with a usable spin measurement. This is the sample behind average spin. Uses pitches recorded as knuckleball.
Understanding Knuckleball: Pitches with Spin
Number of pitches with a usable spin measurement. This is the sample behind average spin. Uses pitches recorded as knuckleball.
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.