Aroldis Chapman has the best K/9 with more than 40.0 innings pitched in a season, with 17.67 per nine innings in 2014.
Interpreted as:
best so/9 single season >40 ip by a player| NAME | K/9 | IP | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | A. Chapman | 17.67 | 54.0 | 2014 | 54 | 0 | 3 | .000 | 0 | 2.00 | 106 | 0 | 0 | 36 | 21 | 12 | 12 | 1 | 24 | 2 | 44 | 0 | 202 | 4 | 4.00 | 4.42 | 0.17 | 52.5 | 11.9 | 0.83 | .290 | 2.00 | 54 | 0.89 | 23 | 3.50 | 17 | |
| 2 |  | E. DÃaz | 17.13 | 62.0 | 2022 | 61 | 3 | 1 | .750 | 0 | 1.31 | 118 | 0 | 0 | 32 | 34 | 9 | 9 | 3 | 18 | 2 | 49 | 1 | 235 | 2 | 2.61 | 6.56 | 0.44 | 50.2 | 7.7 | 0.84 | .330 | 1.31 | 34 | 0.90 | 23 | 4.94 | 21.2 | |
| 3 |  | C. Kimbrel | 16.66 | 62.2 | 2012 | 63 | 3 | 1 | .750 | 0 | 1.01 | 116 | 0 | 0 | 42 | 27 | 7 | 7 | 3 | 14 | 2 | 56 | 0 | 231 | 5 | 2.01 | 8.29 | 0.43 | 50.2 | 6.1 | 0.65 | .250 | 1.01 | 26 | 0.77 | 20 | 3.88 | 21.6 | |
| 4 |  | C. Kimbrel | 16.43 | 69.0 | 2017 | 67 | 5 | 0 | 1.000 | 0 | 1.43 | 126 | 0 | 0 | 35 | 33 | 11 | 11 | 6 | 14 | 4 | 51 | 0 | 254 | 5 | 1.83 | 9.00 | 0.78 | 49.6 | 5.5 | 0.68 | .260 | 1.43 | 31 | 1.41 | 32 | 4.30 | 22.7 | |
| 5 |  | J. Hader | 16.41 | 75.2 | 2019 | 61 | 3 | 5 | .375 | 0 | 2.62 | 138 | 0 | 0 | 37 | 41 | 22 | 24 | 15 | 20 | 4 | 46 | 2 | 289 | 0 | 2.38 | 6.90 | 1.78 | 47.8 | 6.9 | 0.81 | .232 | 2.85 | 59 | 3.08 | 70 | 4.88 | 11.3 | |
| 6 |  | A. Chapman | 16.31 | 51.1 | 2018 | 55 | 3 | 0 | 1.000 | 0 | 2.45 | 93 | 0 | 0 | 32 | 24 | 14 | 15 | 2 | 30 | 5 | 43 | 0 | 212 | 9 | 5.26 | 3.10 | 0.35 | 43.9 | 14.2 | 1.05 | .268 | 2.63 | 58 | 2.08 | 48 | 4.21 | 12.5 | |
| 7 |  | F. Bautista | 16.23 | 61.0 | 2023 | 56 | 8 | 2 | .800 | 0 | 1.48 | 110 | 0 | 0 | 33 | 30 | 10 | 14 | 4 | 26 | 2 | 46 | 0 | 237 | 7 | 3.84 | 4.23 | 0.59 | 46.4 | 11.0 | 0.92 | .274 | 2.07 | 35 | 1.87 | 45 | 4.43 | 16 | |
| 8 |  | K. Jansen | 16.10 | 53.2 | 2011 | 51 | 2 | 1 | .667 | 0 | 2.85 | 96 | 0 | 0 | 5 | 30 | 17 | 17 | 3 | 26 | 2 | 13 | 0 | 218 | 0 | 4.36 | 3.69 | 0.50 | 44.0 | 11.9 | 1.04 | .297 | 2.85 | 79 | 1.73 | 46 | 5.03 | 12.5 | |
| 9 | | C. Marmol | 15.99 | 77.2 | 2010 | 77 | 2 | 3 | .400 | 0 | 2.55 | 138 | 0 | 0 | 38 | 40 | 22 | 23 | 1 | 52 | 8 | 70 | 4 | 332 | 2 | 6.03 | 2.65 | 0.12 | 41.6 | 15.7 | 1.18 | .293 | 2.67 | 62 | 2.00 | 50 | 4.64 | 17.4 | |
| 10 |  | A. Chapman | 15.89 | 58.1 | 2023 | TOT | 61 | 6 | 4 | .600 | 0 | 3.09 | 103 | 0 | 0 | 6 | 37 | 20 | 24 | 4 | 36 | 1 | 18 | 2 | 249 | 9 | 5.55 | 2.86 | 0.62 | 41.4 | 14.5 | 1.25 | .314 | 3.70 | 71 | 2.51 | 58 | 5.71 | 11.7 |
| 11 | | A. Chapman | 15.83 | 63.2 | 2013 | 68 | 4 | 5 | .444 | 0 | 2.54 | 112 | 0 | 0 | 38 | 37 | 18 | 18 | 7 | 29 | 3 | 55 | 0 | 258 | 6 | 4.10 | 3.86 | 0.99 | 43.4 | 11.2 | 1.04 | .280 | 2.54 | 67 | 2.46 | 64 | 5.23 | 9.8 | |
| 12 | | J. Hader | 15.82 | 81.1 | 2018 | 55 | 6 | 1 | .857 | 0 | 2.43 | 143 | 0 | 0 | 12 | 36 | 22 | 23 | 9 | 30 | 1 | 14 | 0 | 306 | 0 | 3.32 | 4.77 | 1.00 | 46.7 | 9.8 | 0.81 | .220 | 2.55 | 60 | 2.22 | 55 | 3.98 | 16.6 | |
| 13 | | A. Chapman | 15.74 | 66.1 | 2015 | 65 | 4 | 4 | .500 | 0 | 1.63 | 116 | 0 | 0 | 33 | 43 | 12 | 13 | 3 | 33 | 5 | 54 | 1 | 278 | 7 | 4.48 | 3.52 | 0.41 | 41.7 | 11.9 | 1.15 | .331 | 1.76 | 41 | 1.94 | 49 | 5.83 | 14.6 | |
| 14 | | J. Hader | 15.65 | 58.2 | 2021 | 60 | 4 | 2 | .667 | 0 | 1.23 | 102 | 0 | 0 | 34 | 25 | 8 | 8 | 3 | 24 | 2 | 42 | 0 | 224 | 3 | 3.68 | 4.25 | 0.46 | 45.5 | 10.7 | 0.84 | .237 | 1.23 | 29 | 1.68 | 39 | 3.84 | 16.8 | |
| 15 | | D. Betances | 15.53 | 73.0 | 2016 | 73 | 3 | 6 | .333 | 0 | 3.08 | 126 | 0 | 0 | 12 | 54 | 25 | 31 | 5 | 28 | 1 | 20 | 0 | 299 | 6 | 3.45 | 4.50 | 0.62 | 42.1 | 9.4 | 1.12 | .353 | 3.82 | 73 | 1.77 | 40 | 6.66 | 20.7 | |
| 16 | | D. Betances | 15.52 | 66.2 | 2018 | 66 | 4 | 6 | .400 | 0 | 2.70 | 115 | 0 | 0 | 4 | 44 | 20 | 22 | 7 | 26 | 5 | 15 | 2 | 272 | 4 | 3.51 | 4.42 | 0.95 | 42.3 | 9.6 | 1.05 | .311 | 2.97 | 63 | 2.47 | 57 | 5.94 | 13.5 | |
| 17 | | A. Chapman | 15.50 | 56.1 | 2021 | 61 | 6 | 4 | .600 | 0 | 3.36 | 97 | 0 | 0 | 30 | 36 | 21 | 23 | 9 | 38 | 3 | 46 | 2 | 243 | 7 | 6.07 | 2.55 | 1.44 | 39.9 | 15.6 | 1.31 | .281 | 3.67 | 79 | 3.98 | 92 | 5.75 | 2.1 | |
| 18 | | M. Barnes | 15.39 | 64.1 | 2019 | 70 | 5 | 4 | .556 | 0 | 3.78 | 110 | 0 | 0 | 4 | 51 | 27 | 29 | 8 | 38 | 2 | 14 | 2 | 285 | 13 | 5.32 | 2.89 | 1.12 | 38.6 | 13.3 | 1.38 | .339 | 4.06 | 78 | 3.26 | 72 | 7.13 | 9 | |
| 19 | | E. DÃaz | 15.36 | 58.0 | 2019 | 66 | 2 | 7 | .222 | 0 | 5.59 | 99 | 0 | 0 | 26 | 58 | 36 | 36 | 15 | 22 | 4 | 48 | 3 | 254 | 3 | 3.41 | 4.50 | 2.33 | 39.0 | 8.7 | 1.38 | .377 | 5.59 | 137 | 4.50 | 105 | 9.00 | -1.4 | |
| 20 |  | E. DÃaz | 15.33 | 51.2 | 2016 | 49 | 0 | 4 | .000 | 0 | 2.79 | 88 | 0 | 0 | 18 | 45 | 16 | 16 | 5 | 15 | 3 | 23 | 2 | 217 | 6 | 2.61 | 5.87 | 0.87 | 40.6 | 6.9 | 1.16 | .377 | 2.79 | 70 | 2.04 | 49 | 7.84 | 12.4 | |
| 21 | | A. Chapman | 15.32 | 71.2 | 2012 | 68 | 5 | 5 | .500 | 0 | 1.51 | 122 | 0 | 0 | 38 | 35 | 12 | 13 | 4 | 23 | 4 | 52 | 0 | 276 | 4 | 2.89 | 5.30 | 0.50 | 44.2 | 8.3 | 0.81 | .252 | 1.63 | 38 | 1.54 | 38 | 4.40 | 19.3 | |
| 22 | | N. Anderson | 15.23 | 65.0 | 2019 | TOT | 68 | 5 | 4 | .556 | 0 | 3.32 | 110 | 0 | 0 | 1 | 52 | 24 | 24 | 8 | 18 | 2 | 3 | 4 | 264 | 4 | 2.49 | 6.11 | 1.11 | 41.7 | 6.8 | 1.08 | .349 | 3.32 | 79 | 2.34 | 54 | 7.20 | 14.7 |
| 23 | | E. DÃaz | 15.22 | 73.1 | 2018 | 73 | 0 | 4 | .000 | 0 | 1.96 | 124 | 0 | 0 | 57 | 41 | 16 | 17 | 5 | 17 | 6 | 65 | 0 | 280 | 3 | 2.09 | 7.29 | 0.61 | 44.3 | 6.1 | 0.79 | .281 | 2.09 | 48 | 1.60 | 38 | 5.03 | 21.3 | |
| 24 | | M. Miller | 15.18 | 61.2 | 2025 | TOT | 60 | 1 | 2 | .333 | 0 | 2.63 | 104 | 0 | 0 | 22 | 28 | 18 | 19 | 5 | 28 | 1 | 37 | 2 | 234 | 3 | 4.09 | 3.71 | 0.73 | 44.4 | 12.0 | 0.91 | .240 | 2.77 | 64 | 2.22 | 53 | 4.09 | 13.2 |
| 25 | | C. Kimbrel | 15.08 | 59.2 | 2021 | TOT | 63 | 4 | 5 | .444 | 0 | 2.26 | 100 | 0 | 0 | 24 | 31 | 15 | 19 | 6 | 23 | 3 | 43 | 1 | 235 | 8 | 3.47 | 4.35 | 0.91 | 42.6 | 9.8 | 0.91 | .243 | 2.87 | 52 | 2.42 | 55 | 4.68 | 12.6 |
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Phillies - y | 96 | 66 | .593 | |
83 | 79 | .512 | 13.0 | |
79 | 83 | .488 | 17.0 | |
76 | 86 | .469 | 20.0 | |
66 | 96 | .407 | 30.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 97 | 65 | .599 | |
 Cubs - w | 92 | 70 | .568 | 5.0 |
 Reds - w | 83 | 79 | .512 | 14.0 |
78 | 84 | .481 | 19.0 | |
71 | 91 | .438 | 26.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 93 | 69 | .574 | |
 Padres - w | 90 | 72 | .556 | 3.0 |
81 | 81 | .500 | 12.0 | |
80 | 82 | .494 | 13.0 | |
43 | 119 | .265 | 50.0 |
Marlins
Nationals
Giants
Diamondbacks
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Blue Jays - y | 94 | 68 | .580 | |
 Yankees - w | 94 | 68 | .580 | |
 Red Sox - w | 89 | 73 | .549 | 5.0 |
77 | 85 | .475 | 17.0 | |
75 | 87 | .463 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 88 | 74 | .543 | |
 Tigers - w | 87 | 75 | .537 | 1.0 |
82 | 80 | .506 | 6.0 | |
70 | 92 | .432 | 18.0 | |
60 | 102 | .370 | 28.0 | |
| AL West | W | L | PCT | GB |
 Mariners - y | 90 | 72 | .556 | |
87 | 75 | .537 | 3.0 | |
81 | 81 | .500 | 9.0 | |
76 | 86 | .469 | 14.0 | |
72 | 90 | .444 | 18.0 |
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