Edwin Díaz has the best career K/9 by a relief pitcher when pitching at least 200 innings, with 14.52 per nine innings.
| NAME | K/9 | IP | 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 | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | E. Díaz | 14.52 | 532.0 | 535 | 30 | 38 | .441 | 0 | 3.01 | 858 | 0 | 0 | 260 | 377 | 178 | 191 | 57 | 192 | 42 | 406 | 11 | 2,176 | 34 | 3.25 | 4.47 | 0.96 | 39.4 | 8.8 | 1.07 | .312 | 3.23 | 6.38 |
| 2 |  | D. Betances | 14.47 | 392.1 | 373 | 21 | 23 | .477 | 0 | 2.55 | 631 | 0 | 0 | 36 | 239 | 111 | 124 | 26 | 181 | 28 | 86 | 5 | 1,604 | 28 | 4.15 | 3.49 | 0.60 | 39.3 | 11.3 | 1.07 | .289 | 2.84 | 5.48 |
| 3 |  | A. Chapman | 14.44 | 862.0 | 905 | 62 | 51 | .549 | 0 | 2.50 | 1,383 | 0 | 0 | 394 | 506 | 239 | 266 | 56 | 426 | 34 | 597 | 7 | 3,512 | 89 | 4.45 | 3.25 | 0.58 | 39.4 | 12.1 | 1.08 | .279 | 2.78 | 5.28 |
| 4 |  | J. Hader | 14.44 | 542.1 | 499 | 38 | 32 | .543 | 0 | 2.54 | 870 | 0 | 0 | 243 | 295 | 153 | 167 | 66 | 208 | 24 | 345 | 6 | 2,132 | 19 | 3.45 | 4.18 | 1.10 | 40.8 | 9.8 | 0.93 | .238 | 2.77 | 4.90 |
| 5 | | D. Williams | 13.81 | 336.1 | 350 | 34 | 18 | .654 | 0 | 2.70 | 516 | 0 | 0 | 102 | 217 | 101 | 125 | 23 | 158 | 15 | 156 | 5 | 1,389 | 18 | 4.23 | 3.27 | 0.62 | 37.1 | 11.4 | 1.11 | .287 | 3.34 | 5.81 |
| 6 |  | C. Kimbrel | 13.79 | 857.2 | 886 | 56 | 50 | .528 | 0 | 2.67 | 1,314 | 0 | 0 | 440 | 522 | 254 | 283 | 79 | 363 | 42 | 672 | 12 | 3,457 | 74 | 3.81 | 3.62 | 0.83 | 38.0 | 10.5 | 1.03 | .267 | 2.97 | 5.48 |
| 7 | | F. Cruz | 12.98 | 234.1 | 240 | 11 | 20 | .355 | 0 | 4.03 | 338 | 0 | 0 | 4 | 179 | 105 | 114 | 24 | 125 | 8 | 34 | 4 | 1,003 | 22 | 4.80 | 2.70 | 0.92 | 33.7 | 12.5 | 1.30 | .305 | 4.38 | 6.87 |
| 8 | | A. Miller | 12.93 | 504.0 | 546 | 35 | 28 | .556 | 0 | 2.95 | 724 | 0 | 0 | 63 | 351 | 165 | 183 | 47 | 201 | 46 | 147 | 9 | 2,091 | 25 | 3.59 | 3.60 | 0.84 | 34.6 | 9.6 | 1.10 | .283 | 3.27 | 6.27 |
| 9 |  | A. Muñoz | 12.58 | 304.2 | 311 | 17 | 28 | .378 | 0 | 2.72 | 426 | 0 | 0 | 100 | 204 | 92 | 108 | 23 | 122 | 17 | 162 | 12 | 1,238 | 21 | 3.60 | 3.49 | 0.68 | 34.4 | 9.9 | 1.07 | .278 | 3.19 | 6.03 |
| 10 |  | C. Smith | 12.53 | 204.0 | 202 | 17 | 7 | .708 | 0 | 2.38 | 284 | 0 | 0 | 48 | 149 | 54 | 65 | 9 | 54 | 8 | 76 | 4 | 815 | 9 | 2.38 | 5.26 | 0.40 | 34.8 | 6.6 | 1.00 | .304 | 2.87 | 6.57 |
| 11 | | C. Marmol | 12.33 | 509.1 | 506 | 18 | 29 | .383 | 0 | 3.25 | 698 | 0 | 0 | 117 | 324 | 184 | 195 | 37 | 340 | 47 | 259 | 20 | 2,207 | 32 | 6.01 | 2.05 | 0.65 | 31.6 | 15.4 | 1.30 | .265 | 3.45 | 5.73 |
| 12 |  | K. Jansen | 12.33 | 960.0 | 970 | 57 | 44 | .564 | 0 | 2.62 | 1,315 | 0 | 0 | 490 | 630 | 279 | 299 | 93 | 302 | 32 | 727 | 21 | 3,817 | 22 | 2.83 | 4.35 | 0.87 | 34.5 | 7.9 | 0.97 | .259 | 2.80 | 5.91 |
| 13 | | K. Yates | 12.32 | 486.2 | 510 | 31 | 29 | .517 | 0 | 3.38 | 666 | 0 | 0 | 101 | 358 | 183 | 198 | 66 | 194 | 33 | 231 | 13 | 2,028 | 19 | 3.59 | 3.43 | 1.22 | 32.8 | 9.6 | 1.13 | .273 | 3.66 | 6.62 |
| 14 | | K. Giles | 12.26 | 355.1 | 362 | 14 | 18 | .438 | 0 | 2.71 | 484 | 0 | 0 | 115 | 283 | 107 | 121 | 28 | 114 | 5 | 208 | 5 | 1,454 | 24 | 2.89 | 4.25 | 0.71 | 33.3 | 7.8 | 1.12 | .310 | 3.06 | 7.17 |
| 15 | | R. Dibble | 12.17 | 477.0 | 385 | 27 | 25 | .519 | 0 | 2.98 | 645 | 0 | 0 | 89 | 332 | 158 | 169 | 27 | 238 | 12 | 204 | 25 | 1,979 | 36 | 4.49 | 2.71 | 0.51 | 32.6 | 12.0 | 1.19 | .289 | 3.19 | 6.26 |
| 16 | | B. Abreu | 12.13 | 374.2 | 365 | 20 | 15 | .571 | 0 | 2.86 | 505 | 0 | 0 | 23 | 271 | 119 | 131 | 32 | 181 | 26 | 85 | 0 | 1,567 | 24 | 4.35 | 2.79 | 0.77 | 32.2 | 11.6 | 1.21 | .290 | 3.15 | 6.51 |
| 17 | | T. Rosenthal | 12.12 | 364.0 | 373 | 12 | 25 | .324 | 0 | 3.36 | 490 | 0 | 0 | 132 | 304 | 136 | 145 | 19 | 177 | 22 | 207 | 8 | 1,570 | 23 | 4.38 | 2.77 | 0.47 | 31.2 | 11.3 | 1.32 | .331 | 3.59 | 7.52 |
| 18 | | A. Vesia | 12.06 | 315.2 | 354 | 18 | 14 | .563 | 0 | 2.94 | 423 | 0 | 0 | 16 | 206 | 103 | 122 | 36 | 154 | 12 | 52 | 16 | 1,309 | 9 | 4.39 | 2.75 | 1.03 | 32.3 | 11.8 | 1.14 | .249 | 3.48 | 5.87 |
| 19 | | C. Knebel | 12.05 | 301.0 | 308 | 13 | 16 | .448 | 0 | 3.29 | 403 | 0 | 0 | 72 | 231 | 110 | 121 | 34 | 143 | 11 | 137 | 13 | 1,260 | 7 | 4.28 | 2.82 | 1.02 | 32.0 | 11.3 | 1.24 | .294 | 3.62 | 6.91 |
| 20 | | B. Wagner | 11.92 | 903.0 | 853 | 47 | 40 | .540 | 0 | 2.31 | 1,196 | 0 | 0 | 422 | 601 | 232 | 262 | 82 | 300 | 33 | 703 | 26 | 3,600 | 43 | 2.99 | 3.99 | 0.82 | 33.2 | 8.3 | 1.00 | .261 | 2.61 | 5.99 |
| 21 | | B. Lidge | 11.92 | 600.1 | 602 | 26 | 32 | .448 | 0 | 3.55 | 795 | 0 | 0 | 225 | 490 | 237 | 257 | 57 | 285 | 33 | 368 | 41 | 2,576 | 46 | 4.27 | 2.79 | 0.85 | 30.9 | 11.1 | 1.29 | .308 | 3.85 | 7.35 |
| 22 | | D. Robertson | 11.84 | 893.1 | 880 | 68 | 46 | .596 | 0 | 2.93 | 1,175 | 0 | 0 | 179 | 674 | 291 | 315 | 81 | 364 | 25 | 358 | 38 | 3,687 | 57 | 3.67 | 3.23 | 0.82 | 31.9 | 9.9 | 1.16 | .290 | 3.17 | 6.79 |
| 23 | | M. Feliz | 11.82 | 249.2 | 227 | 17 | 8 | .680 | 0 | 5.12 | 328 | 0 | 0 | 1 | 237 | 142 | 151 | 42 | 108 | 7 | 54 | 2 | 1,091 | 18 | 3.89 | 3.04 | 1.51 | 30.1 | 9.9 | 1.38 | .322 | 5.44 | 8.54 |
| 24 | | J. Leclerc | 11.74 | 365.2 | 357 | 12 | 21 | .364 | 0 | 3.35 | 477 | 0 | 0 | 41 | 247 | 136 | 150 | 32 | 203 | 21 | 141 | 8 | 1,546 | 25 | 5.00 | 2.35 | 0.79 | 30.9 | 13.1 | 1.23 | .264 | 3.69 | 6.08 |
| 25 | | L. Hendriks | 11.73 | 482.0 | 446 | 30 | 21 | .588 | 0 | 3.16 | 628 | 0 | 0 | 116 | 408 | 169 | 190 | 49 | 111 | 9 | 218 | 13 | 1,953 | 36 | 2.07 | 5.66 | 0.91 | 32.2 | 5.7 | 1.08 | .311 | 3.55 | 7.62 |
StatMuse has game-level data for K/9 and innings pitched going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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159
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
74 | 50 | .597 | ||
67 | 58 | .536 | 7.5 | |
64 | 61 | .512 | 10.5 | |
60 | 66 | .476 | 15.0 | |
56 | 69 | .448 | 18.5 | |
| NL Central | W | L | PCT | GB |
77 | 48 | .616 | ||
72 | 53 | .576 | 5.0 | |
63 | 61 | .508 | 13.5 | |
61 | 65 | .484 | 16.5 | |
59 | 64 | .480 | 17.0 | |
| NL West | W | L | PCT | GB |
74 | 51 | .592 | ||
67 | 58 | .536 | 7.0 | |
66 | 59 | .528 | 8.0 | |
51 | 73 | .411 | 22.5 | |
50 | 74 | .403 | 23.5 |
Brewers
Cubs
Cardinals
Pirates
Reds
Dodgers
Diamondbacks
Giants
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
74 | 49 | .602 | ||
69 | 55 | .556 | 5.5 | |
66 | 58 | .532 | 8.5 | |
61 | 63 | .492 | 13.5 | |
61 | 65 | .484 | 14.5 | |
| AL Central | W | L | PCT | GB |
65 | 58 | .528 | ||
60 | 64 | .484 | 5.5 | |
60 | 65 | .480 | 6.0 | |
60 | 65 | .480 | 6.0 | |
51 | 74 | .408 | 15.0 | |
| AL West | W | L | PCT | GB |
63 | 62 | .504 | ||
61 | 64 | .488 | 2.0 | |
59 | 66 | .472 | 4.0 | |
49 | 75 | .395 | 13.5 | |
49 | 76 | .392 | 14.0 |
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