Edwin Díaz has the best career K/9 by a relief pitcher when pitching at least 350 innings, with 14.49 per nine innings.
- Regular season
| 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 | 14.49 | 533.0 | 536 | 30 | 38 | .441 | 0 | 3.06 | 858 | 0 | 0 | 260 | 381 | 181 | 194 | 57 | 192 | 43 | 407 | 11 | 2,184 | 34 | 3.24 | 4.47 | 0.96 | 39.3 | 8.8 | 1.08 | .313 | 3.28 | 6.43 |
| 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 | 872.0 | 915 | 63 | 51 | .553 | 0 | 2.49 | 1,399 | 0 | 0 | 401 | 510 | 241 | 268 | 57 | 431 | 34 | 606 | 7 | 3,551 | 90 | 4.45 | 3.25 | 0.59 | 39.4 | 12.1 | 1.08 | .278 | 2.77 | 5.26 |
| 4 |  | J. Hader | 14.35 | 553.2 | 510 | 38 | 32 | .543 | 0 | 2.50 | 883 | 0 | 0 | 251 | 298 | 154 | 168 | 66 | 209 | 24 | 355 | 6 | 2,170 | 19 | 3.40 | 4.22 | 1.07 | 40.7 | 9.6 | 0.92 | .235 | 2.73 | 4.84 |
| 5 |  | C. Kimbrel | 13.73 | 866.2 | 896 | 57 | 53 | .518 | 0 | 2.69 | 1,322 | 0 | 0 | 441 | 531 | 259 | 290 | 79 | 368 | 43 | 674 | 13 | 3,498 | 74 | 3.82 | 3.59 | 0.82 | 37.8 | 10.5 | 1.04 | .268 | 3.01 | 5.51 |
| 6 | | 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 |
| 7 | | 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 |
| 8 |  | K. Jansen | 12.31 | 969.1 | 981 | 58 | 46 | .558 | 0 | 2.61 | 1,326 | 0 | 0 | 495 | 634 | 281 | 302 | 95 | 305 | 33 | 736 | 21 | 3,851 | 22 | 2.83 | 4.35 | 0.88 | 34.4 | 7.9 | 0.97 | .258 | 2.80 | 5.89 |
| 9 | | 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 |
| 10 | | K. Yates | 12.25 | 492.1 | 516 | 32 | 29 | .525 | 0 | 3.36 | 670 | 0 | 0 | 101 | 363 | 184 | 199 | 66 | 198 | 33 | 231 | 13 | 2,052 | 19 | 3.62 | 3.38 | 1.21 | 32.7 | 9.6 | 1.14 | .274 | 3.64 | 6.64 |
| 11 | | 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 |
| 12 | | B. Abreu | 12.15 | 388.0 | 378 | 22 | 16 | .579 | 0 | 2.83 | 524 | 0 | 0 | 24 | 279 | 122 | 134 | 33 | 188 | 27 | 89 | 0 | 1,620 | 26 | 4.36 | 2.79 | 0.77 | 32.3 | 11.6 | 1.20 | .290 | 3.11 | 6.47 |
| 13 | | 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 |
| 14 | | 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 |
| 15 | | 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 |
| 16 | | 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 |
| 17 | | 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 |
| 18 | | 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 |
| 19 | | E. Gagne | 11.70 | 378.1 | 354 | 23 | 13 | .639 | 0 | 2.62 | 492 | 0 | 0 | 187 | 264 | 110 | 115 | 33 | 113 | 15 | 269 | 12 | 1,505 | 10 | 2.69 | 4.35 | 0.79 | 32.7 | 7.5 | 1.00 | .271 | 2.74 | 6.28 |
| 20 | | C. Allen | 11.51 | 463.2 | 481 | 24 | 31 | .436 | 0 | 3.14 | 593 | 0 | 0 | 153 | 375 | 162 | 179 | 55 | 193 | 10 | 291 | 13 | 1,943 | 40 | 3.75 | 3.07 | 1.07 | 30.5 | 9.9 | 1.23 | .293 | 3.47 | 7.28 |
| 21 | | T. Scott | 11.50 | 484.1 | 508 | 33 | 34 | .493 | 0 | 3.62 | 619 | 0 | 0 | 100 | 398 | 195 | 220 | 43 | 233 | 26 | 198 | 18 | 2,068 | 30 | 4.33 | 2.66 | 0.80 | 29.9 | 11.3 | 1.30 | .310 | 4.09 | 7.40 |
| 22 | | J. Hoffman | 11.43 | 360.0 | 344 | 27 | 21 | .563 | 0 | 3.97 | 457 | 0 | 0 | 50 | 309 | 159 | 177 | 44 | 151 | 22 | 138 | 11 | 1,546 | 27 | 3.78 | 3.03 | 1.10 | 29.6 | 9.8 | 1.28 | .304 | 4.43 | 7.73 |
| 23 | | J. Alvarado | 11.42 | 422.1 | 469 | 23 | 29 | .442 | 0 | 3.69 | 536 | 0 | 0 | 53 | 349 | 173 | 199 | 31 | 217 | 21 | 108 | 21 | 1,832 | 42 | 4.62 | 2.47 | 0.66 | 29.3 | 11.8 | 1.34 | .310 | 4.24 | 7.44 |
| 24 | | J. Diekman | 11.42 | 602.1 | 705 | 27 | 34 | .443 | 0 | 3.91 | 764 | 0 | 0 | 19 | 483 | 262 | 312 | 53 | 358 | 47 | 141 | 21 | 2,662 | 44 | 5.35 | 2.13 | 0.79 | 28.7 | 13.4 | 1.40 | .299 | 4.66 | 7.22 |
| 25 | | K. Uehara | 11.39 | 414.0 | 424 | 20 | 22 | .476 | 0 | 2.43 | 524 | 0 | 0 | 95 | 279 | 112 | 120 | 53 | 66 | 4 | 207 | 8 | 1,583 | 9 | 1.43 | 7.94 | 1.15 | 33.1 | 4.2 | 0.83 | .241 | 2.61 | 6.07 |
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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|---|---|---|---|---|
88 | 63 | .583 | ||
83 | 67 | .553 | 4.5 | |
74 | 77 | .490 | 14.0 | |
70 | 81 | .464 | 18.0 | |
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| NL Central | W | L | PCT | GB |
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75 | 75 | .500 | 18.0 | |
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| NL West | W | L | PCT | GB |
 Dodgers - x | 91 | 59 | .607 | |
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