Mike Freeman, Nick Maton and Romy Gonzalez were tied for the highest strikeout percentage in a season in 2021, with a strikeout percentage of 100.0.
| 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 | 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 | 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 | 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 | | C. Roe | 50.0 | 2021 | 1 | 0 | 0 | 0 | 27.00 | 2 | 0 | 0 | 0 | 0.2 | 1 | 2 | 2 | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 27.00 | 13.50 | 2.00 | 0.00 | 25.0 | 3.00 | 1.000 | 27.00 | 658 | 1.66 | 40 | 13.50 | 0.2 | ||
| 5 | | A. Vasquez | 50.0 | 2021 | 2 | 0 | 0 | 0 | 0.00 | 3 | 0 | 0 | 0 | 1.2 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 6 | 0 | 16.20 | 0.00 | 0.00 | 0.0 | 0.60 | .333 | 5.40 | 0 | -0.44 | -10 | 5.40 | 0.9 | |||
| 6 |  | J. Hader | 45.5 | 2021 | 60 | 4 | 2 | .667 | 0 | 1.23 | 102 | 0 | 0 | 34 | 58.2 | 25 | 8 | 8 | 3 | 24 | 2 | 42 | 0 | 224 | 3 | 15.65 | 3.68 | 4.25 | 0.46 | 10.7 | 0.84 | .237 | 1.23 | 29 | 1.68 | 39 | 3.84 | 16.8 | |
| 7 |  | J. deGrom | 45.1 | 2021 | 15 | 7 | 2 | .778 | 15 | 1.08 | 146 | 1 | 1 | 0 | 92.0 | 40 | 11 | 14 | 6 | 11 | 1 | 0 | 0 | 324 | 0 | 14.28 | 1.08 | 13.27 | 0.59 | 3.4 | 0.55 | .213 | 1.37 | 27 | 1.23 | 29 | 3.91 | 30.6 | |
| 8 | | P. Weigel | 42.9 | 2021 | 3 | 0 | 0 | 0 | 4.50 | 9 | 0 | 0 | 0 | 4.0 | 4 | 2 | 2 | 1 | 4 | 1 | 1 | 0 | 21 | 1 | 20.25 | 9.00 | 2.25 | 2.25 | 19.0 | 2.00 | .500 | 4.50 | 107 | 5.66 | 132 | 9.00 | -0.6 | ||
| 9 |  | C. Kimbrel | 42.6 | 2021 | TOT | 63 | 4 | 5 | .444 | 0 | 2.26 | 100 | 0 | 0 | 24 | 59.2 | 31 | 15 | 19 | 6 | 23 | 3 | 43 | 1 | 235 | 8 | 15.08 | 3.47 | 4.35 | 0.91 | 9.8 | 0.91 | .243 | 2.87 | 52 | 2.42 | 55 | 4.68 | 12.6 |
| 10 | | L. Hendriks | 42.3 | 2021 | 69 | 8 | 3 | .727 | 0 | 2.54 | 113 | 0 | 0 | 38 | 71.0 | 45 | 20 | 23 | 11 | 7 | 1 | 58 | 1 | 267 | 6 | 14.32 | 0.89 | 16.14 | 1.39 | 2.6 | 0.73 | .252 | 2.92 | 58 | 2.33 | 52 | 5.70 | 16.2 | |
| 11 | | S. Nogosek | 41.7 | 2021 | 1 | 0 | 1 | .000 | 0 | 6.00 | 5 | 0 | 0 | 0 | 3.0 | 3 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 12 | 0 | 15.00 | 0.00 | 6.00 | 0.0 | 1.00 | .200 | 6.00 | 151 | 8.50 | 202 | 9.00 | -1.4 | ||
| 12 | | A. Warren | 41.5 | 2021 | 26 | 3 | 0 | 1.000 | 0 | 1.29 | 34 | 0 | 0 | 0 | 21.0 | 11 | 3 | 3 | 1 | 8 | 1 | 6 | 1 | 82 | 0 | 14.57 | 3.43 | 4.25 | 0.43 | 9.8 | 0.90 | .263 | 1.29 | 29 | 1.83 | 41 | 4.71 | 5.9 | |
| 13 | | D. Altavilla | 40.0 | 2021 | 2 | 0 | 0 | 0 | 6.75 | 2 | 0 | 0 | 0 | 1.1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 5 | 0 | 13.50 | 0.00 | 6.75 | 0.0 | 0.75 | .000 | 6.75 | 171 | 9.91 | 236 | 6.75 | -0.9 | |||
| 14 |  | J. Paxton | 40.0 | 2021 | 1 | 0 | 0 | 1 | 6.75 | 2 | 0 | 0 | 0 | 1.1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 5 | 1 | 13.50 | 6.75 | 2.00 | 0.00 | 20.0 | 0.75 | .000 | 6.75 | 163 | 2.41 | 58 | 0.00 | 0.3 | ||
| 15 | | R. Bolanos | 40.0 | 2021 | 3 | 0 | 0 | 0 | 1.42 | 10 | 0 | 0 | 0 | 6.1 | 4 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 25 | 0 | 14.21 | 2.84 | 5.00 | 0.00 | 8.0 | 0.95 | .308 | 1.42 | 32 | 0.95 | 22 | 5.68 | 2.3 | ||
| 16 |  | A. Chapman | 39.9 | 2021 | 61 | 6 | 4 | .600 | 0 | 3.36 | 97 | 0 | 0 | 30 | 56.1 | 36 | 21 | 23 | 9 | 38 | 3 | 46 | 2 | 243 | 7 | 15.50 | 6.07 | 2.55 | 1.44 | 15.6 | 1.31 | .281 | 3.67 | 79 | 3.98 | 92 | 5.75 | 2.1 | |
| 17 | | B. Wieck | 39.4 | 2021 | 15 | 0 | 0 | 0 | 0.00 | 28 | 0 | 0 | 0 | 17.0 | 10 | 0 | 0 | 0 | 10 | 0 | 5 | 0 | 71 | 0 | 14.82 | 5.29 | 2.80 | 0.00 | 14.1 | 1.18 | .303 | 0.00 | 0 | 1.63 | 39 | 5.29 | 4.9 | ||
| 18 | | P. Sewald | 39.4 | 2021 | 62 | 10 | 3 | .769 | 0 | 3.06 | 104 | 0 | 0 | 11 | 64.2 | 42 | 22 | 24 | 10 | 24 | 0 | 18 | 5 | 264 | 2 | 14.47 | 3.34 | 4.33 | 1.39 | 9.1 | 1.02 | .254 | 3.34 | 74 | 3.07 | 74 | 5.85 | 7.9 | |
| 19 | | L. Sims | 39.0 | 2021 | 47 | 5 | 3 | .625 | 0 | 4.40 | 76 | 0 | 0 | 7 | 47.0 | 34 | 23 | 26 | 6 | 18 | 4 | 13 | 3 | 195 | 2 | 14.55 | 3.45 | 4.22 | 1.15 | 9.2 | 1.11 | .308 | 4.98 | 100 | 2.99 | 67 | 6.51 | 7.4 | |
| 20 | | D. Williams | 38.5 | 2021 | 58 | 8 | 2 | .800 | 0 | 2.50 | 87 | 0 | 0 | 3 | 54.0 | 36 | 15 | 17 | 5 | 28 | 2 | 6 | 0 | 226 | 2 | 14.50 | 4.67 | 3.11 | 0.83 | 12.4 | 1.19 | .298 | 2.83 | 60 | 2.81 | 66 | 6.00 | 8.8 | |
| 21 | | J. Schreiber | 38.5 | 2021 | 1 | 0 | 0 | 0 | 3.00 | 5 | 0 | 0 | 0 | 3.0 | 4 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 13 | 0 | 15.00 | 3.00 | 5.00 | 0.00 | 7.7 | 1.67 | .571 | 3.00 | 66 | 0.83 | 19 | 12.00 | 1.2 | ||
| 22 | | J. James | 38.1 | 2021 | 5 | 0 | 0 | 0 | 5.40 | 8 | 0 | 0 | 0 | 5.0 | 4 | 3 | 3 | 1 | 2 | 0 | 5 | 0 | 21 | 2 | 14.40 | 3.60 | 4.00 | 1.80 | 9.5 | 1.20 | .300 | 5.40 | 126 | 3.76 | 89 | 7.20 | 0.3 | ||
| 23 | | J. Adam | 38.0 | 2021 | 12 | 1 | 0 | 1.000 | 0 | 5.91 | 19 | 0 | 0 | 0 | 10.2 | 10 | 7 | 7 | 1 | 6 | 3 | 4 | 0 | 50 | 0 | 16.03 | 5.06 | 3.17 | 0.84 | 12.0 | 1.50 | .429 | 5.91 | 142 | 3.35 | 80 | 8.44 | 1 | |
| 24 | | J. Nelson | 37.9 | 2021 | 28 | 1 | 2 | .333 | 1 | 1.86 | 44 | 0 | 0 | 0 | 29.0 | 14 | 6 | 8 | 0 | 13 | 4 | 5 | 0 | 116 | 4 | 13.66 | 4.03 | 3.38 | 0.00 | 11.2 | 0.93 | .255 | 2.48 | 46 | 1.89 | 44 | 4.34 | 7.7 | |
| 25 | | M. Barnes | 37.8 | 2021 | 60 | 6 | 5 | .545 | 0 | 3.79 | 84 | 0 | 0 | 24 | 54.2 | 41 | 23 | 25 | 8 | 20 | 2 | 44 | 2 | 222 | 3 | 13.83 | 3.29 | 4.20 | 1.32 | 9.0 | 1.12 | .306 | 4.12 | 83 | 3.20 | 74 | 6.75 | 6.8 | |
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Braves - y | 94 | 68 | .580 | |
 Phillies - w | 88 | 74 | .543 | 6.0 |
80 | 82 | .494 | 14.0 | |
77 | 85 | .475 | 17.0 | |
74 | 88 | .457 | 20.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 103 | 59 | .636 | |
 Cubs - w | 89 | 73 | .549 | 14.0 |
82 | 80 | .506 | 21.0 | |
77 | 85 | .475 | 26.0 | |
75 | 87 | .463 | 28.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 100 | 62 | .617 | |
 Padres - w | 91 | 71 | .562 | 9.0 |
86 | 76 | .531 | 14.0 | |
65 | 97 | .401 | 35.0 | |
58 | 104 | .358 | 42.0 |
Marlins
Nationals
Diamondbacks
Giants
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Rays - y | 98 | 64 | .605 | |
 Yankees - w | 93 | 68 | .578 | 4.5 |
 Red Sox - w | 87 | 75 | .537 | 11.0 |
79 | 82 | .491 | 18.5 | |
79 | 83 | .488 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 85 | 77 | .525 | |
 White Sox - w | 84 | 78 | .519 | 1.0 |
77 | 85 | .475 | 8.0 | |
76 | 86 | .469 | 9.0 | |
69 | 93 | .426 | 16.0 | |
| AL West | W | L | PCT | GB |
 Astros - y | 81 | 81 | .500 | |
80 | 82 | .494 | 1.0 | |
76 | 86 | .469 | 5.0 | |
64 | 98 | .395 | 17.0 | |
62 | 100 | .383 | 19.0 |
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Twins
Tigers
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Athletics
Angels