13 pitchers are tied for the highest strikeout percentage in a season, with a strikeout percentage of 100.0. The first three are Mike Freeman, Nick Maton and Romy Gonzalez in 2021.
| NAME | K% | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | M. Freeman | 100.0 | 2021 |  CIN | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.84 | -64 | 0.00 | 0.3 | |||
| 2 | | N. Maton | 100.0 | 2021 |  PHI | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.84 | -66 | 0.00 | 0.3 | |||
| 3 | | R. Gonzalez | 100.0 | 2021 |  CWS | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.84 | -64 | 0.00 | 0.3 | |||
| 4 | | M. Brosseau | 100.0 | 2020 |  TBR | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.82 | -66 | 0.00 | 0.3 | |||
| 5 | | D. Betances | 100.0 | 2019 |  NYY | 1 | 0 | 0 | 0 | 0.00 | 2 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.80 | -60 | 0.00 | 0.5 | |||
| 6 | | J. Gyorko | 100.0 | 2019 | TOT | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.80 | -65 | 0.00 | 0.3 | |||
| 7 | | D. Valencia | 100.0 | 2018 |  BAL | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.84 | -65 | 0.00 | 0.3 | |||
| 8 | | J. Nathan | 100.0 | 2015 |  DET | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 1 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.87 | -70 | 0.00 | 0.3 | |||
| 9 | | R. Johnson | 100.0 | 2013 |  STL | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.96 | -79 | 0.00 | 0.2 | |||
| 10 | | J. Dawley | 100.0 | 2002 |  ATL | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -3.05 | -73 | 0.00 | 0.3 | |||
| 11 | | S. Sheldon | 100.0 | 2000 |  TEX | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -2.87 | -58 | 0.00 | 0.3 | |||
| 12 | | K. Seitzer | 100.0 | 1993 | TOT | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -3.02 | -71 | 0.00 | 0.3 | |||
| 13 | | F. Norman | 100.0 | 1967 |  CHC | 1 | 0 | 0 | 0 | 0.00 | 3 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 27.00 | 0.00 | 0.00 | 0.0 | 0.00 | 0.00 | 0 | -3.46 | -102 | 0.00 | 0.7 | |||
| 14 | | K. Greer | 66.7 | 1993 |  NYM | 1 | 1 | 0 | 1.000 | 0 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 18.00 | 0.00 | 0.00 | 0.0 | 0.00 | .000 | 0.00 | 0 | -1.02 | -26 | 0.00 | 0.6 | |
| 15 | | J. Spring | 66.7 | 1957 |  BOS | 1 | 0 | 0 | 0 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 18.00 | 0.00 | 0.00 | 0.0 | 0.00 | .000 | 0.00 | 0 | -1.54 | -37 | 0.00 | 0.6 | ||
| 16 | | W. Hoyt | 66.7 | 1918 |  NYG | 1 | 0 | 0 | 0 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 18.00 | 0.00 | 0.00 | 0.0 | 0.00 | .000 | 0.00 | 0 | -1.77 | -68 | 0.00 | 0.5 | |||
| 17 | | C. Nieson | 62.5 | 1964 |  MIN | 2 | 0 | 0 | 0 | 4.50 | 5 | 0 | 0 | 0 | 2.0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 8 | 0 | 22.50 | 4.50 | 5.00 | 4.50 | 12.5 | 1.00 | .000 | 4.50 | 122 | 5.60 | 146 | 4.50 | -0.4 | |
| 18 | | F. Rodriguez | 61.9 | 2002 |  ANA | 5 | 0 | 0 | 0 | 0.00 | 13 | 0 | 0 | 0 | 5.2 | 3 | 0 | 0 | 0 | 2 | 1 | 4 | 1 | 21 | 0 | 20.65 | 3.18 | 6.50 | 0.00 | 9.5 | 0.88 | .600 | 0.00 | 0 | -0.05 | -1 | 4.76 | 2.8 | |
| 19 | | J. McMillon | 61.5 | 2023 |  KCR | 4 | 0 | 0 | 0 | 2.25 | 8 | 0 | 0 | 0 | 4.0 | 1 | 1 | 1 | 1 | 0 | 0 | 3 | 0 | 13 | 0 | 18.00 | 0.00 | 2.25 | 0.0 | 0.25 | .000 | 2.25 | 50 | 2.50 | 58 | 2.25 | 0.8 | ||
| 20 | | B. Sprowl | 60.0 | 1980 |  HOU | 1 | 0 | 0 | 0 | 0.00 | 3 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 5 | 0 | 27.00 | 9.00 | 3.00 | 0.00 | 20.0 | 2.00 | 1.000 | 0.00 | 0 | -0.26 | -7 | 9.00 | 0.4 | |
| 21 | | J. Shellenback | 60.0 | 1973 |  TEX | 2 | 0 | 0 | 0 | 0.00 | 3 | 0 | 0 | 0 | 1.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 16.20 | 0.00 | 0.00 | 0.0 | 0.00 | .000 | 0.00 | 0 | -1.04 | -28 | 0.00 | 0.9 | ||
| 22 | | F. Wenz | 60.0 | 1968 |  BOS | 1 | 0 | 0 | 0 | 0.00 | 3 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 5 | 0 | 27.00 | 18.00 | 1.50 | 0.00 | 40.0 | 2.00 | 0.00 | 0 | 2.39 | 70 | 0.00 | 0.1 | ||
| 23 | | H. Pina | 57.1 | 1978 |  PHI | 2 | 0 | 0 | 0 | 0.00 | 4 | 0 | 0 | 0 | 2.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 15.43 | 0.00 | 0.00 | 0.0 | 0.00 | .000 | 0.00 | 0 | -0.85 | -24 | 0.00 | 1.1 | ||
| 24 | | G. Hannahs | 55.6 | 1978 |  LAD | 1 | 0 | 0 | 0 | 9.00 | 5 | 0 | 0 | 0 | 2.0 | 3 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 9 | 2 | 22.50 | 0.00 | 0.00 | 0.0 | 1.50 | .750 | 9.00 | 257 | -2.43 | -68 | 13.50 | 1.3 | ||
| 25 | | R. Krawczyk | 54.5 | 1989 |  MIL | 1 | 0 | 0 | 0 | 13.50 | 6 | 0 | 0 | 0 | 2.0 | 4 | 3 | 3 | 0 | 1 | 0 | 1 | 0 | 11 | 0 | 27.00 | 4.50 | 6.00 | 0.00 | 9.1 | 2.50 | 1.000 | 13.50 | 344 | -1.75 | -46 | 18.00 | 1.2 | |
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