Aroldis Chapman has the highest K/9 by a relief pitcher when pitching in 100+ games, with 14.58 per nine innings.
Interpreted as:
highest k/9 relief pitcher 100 or more games| NAME | K/9 | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | A. Chapman | 14.58 | 863 | 60 | 47 | .561 | 0 | 2.52 | 1,331 | 0 | 0 | 367 | 821.1 | 475 | 230 | 255 | 54 | 408 | 33 | 563 | 7 | 3,341 | 87 | 4.47 | 3.26 | 0.59 | 39.8 | 12.2 | 1.08 | .278 | 2.79 | 5.20 |
| 2 |  | J. Hader | 14.56 | 468 | 34 | 31 | .523 | 0 | 2.64 | 829 | 0 | 0 | 226 | 512.1 | 282 | 150 | 164 | 65 | 198 | 24 | 321 | 6 | 2,019 | 19 | 3.48 | 4.19 | 1.14 | 41.1 | 9.8 | 0.94 | .240 | 2.88 | 4.95 |
| 3 |  | E. DÃaz | 14.54 | 520 | 28 | 36 | .438 | 0 | 2.82 | 839 | 0 | 0 | 253 | 519.1 | 356 | 163 | 176 | 54 | 182 | 40 | 395 | 9 | 2,105 | 33 | 3.15 | 4.61 | 0.94 | 39.9 | 8.6 | 1.04 | .305 | 3.05 | 6.17 |
| 4 |  | M. Miller | 14.53 | 119 | 3 | 4 | .429 | 0 | 2.65 | 219 | 0 | 0 | 50 | 135.2 | 71 | 40 | 47 | 12 | 54 | 3 | 81 | 5 | 521 | 6 | 3.58 | 4.06 | 0.80 | 42.0 | 10.4 | 0.92 | .253 | 3.12 | 4.71 |
| 5 | | D. Betances | 14.47 | 373 | 21 | 23 | .477 | 0 | 2.55 | 631 | 0 | 0 | 36 | 392.1 | 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 |
| 6 | | D. Williams | 14.06 | 308 | 31 | 16 | .660 | 0 | 2.45 | 465 | 0 | 0 | 86 | 297.2 | 174 | 81 | 100 | 20 | 137 | 15 | 126 | 4 | 1,211 | 17 | 4.14 | 3.39 | 0.60 | 38.4 | 11.3 | 1.04 | .268 | 3.02 | 5.26 |
| 7 |  | C. Kimbrel | 14.04 | 851 | 56 | 48 | .538 | 0 | 2.58 | 1,282 | 0 | 0 | 440 | 821.2 | 492 | 236 | 263 | 75 | 346 | 40 | 656 | 11 | 3,306 | 70 | 3.79 | 3.71 | 0.82 | 38.8 | 10.5 | 1.02 | .267 | 2.88 | 5.39 |
| 8 | | F. Bautista | 13.83 | 156 | 13 | 7 | .650 | 0 | 2.01 | 248 | 0 | 0 | 67 | 161.1 | 84 | 36 | 42 | 14 | 72 | 3 | 104 | 1 | 632 | 10 | 4.02 | 3.44 | 0.78 | 39.2 | 11.4 | 0.97 | .237 | 2.34 | 4.69 |
| 9 | | J. Karinchak | 13.74 | 174 | 12 | 11 | .522 | 0 | 3.10 | 253 | 0 | 0 | 15 | 165.2 | 98 | 57 | 64 | 18 | 98 | 6 | 48 | 2 | 697 | 15 | 5.32 | 2.58 | 0.98 | 36.3 | 14.1 | 1.18 | .248 | 3.48 | 5.32 |
| 10 | | F. Cruz | 13.52 | 183 | 7 | 14 | .333 | 0 | 4.38 | 275 | 0 | 0 | 2 | 183.0 | 142 | 89 | 94 | 19 | 94 | 6 | 26 | 2 | 784 | 19 | 4.62 | 2.93 | 0.93 | 35.1 | 12.0 | 1.29 | .315 | 4.62 | 6.98 |
| 11 | | J. Estrada | 13.35 | 156 | 10 | 8 | .556 | 0 | 3.47 | 223 | 0 | 0 | 4 | 150.1 | 118 | 58 | 63 | 21 | 65 | 3 | 29 | 4 | 637 | 9 | 3.89 | 3.43 | 1.26 | 35.0 | 10.2 | 1.22 | .298 | 3.77 | 7.06 |
| 12 | | A. Miller | 12.93 | 546 | 35 | 28 | .556 | 0 | 2.95 | 724 | 0 | 0 | 63 | 504.0 | 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 |
| 13 | | A. Adams | 12.92 | 186 | 7 | 7 | .500 | 0 | 3.97 | 221 | 0 | 0 | 0 | 154.0 | 107 | 68 | 77 | 10 | 96 | 44 | 32 | 4 | 696 | 18 | 5.61 | 2.30 | 0.58 | 31.8 | 13.8 | 1.32 | .298 | 4.50 | 6.25 |
| 14 | | M. Brash | 12.59 | 165 | 13 | 8 | .619 | 0 | 2.72 | 208 | 0 | 0 | 8 | 148.2 | 128 | 45 | 49 | 7 | 63 | 9 | 18 | 3 | 634 | 14 | 3.81 | 3.30 | 0.42 | 32.8 | 9.9 | 1.28 | .349 | 2.97 | 7.75 |
| 15 | | C. Smith | 12.50 | 150 | 14 | 6 | .700 | 0 | 2.42 | 207 | 0 | 0 | 17 | 149.0 | 106 | 40 | 47 | 5 | 36 | 7 | 32 | 3 | 589 | 3 | 2.17 | 5.75 | 0.30 | 35.1 | 6.1 | 0.95 | .302 | 2.84 | 6.40 |
| 16 |  | K. Jansen | 12.40 | 934 | 54 | 40 | .574 | 0 | 2.57 | 1,278 | 0 | 0 | 475 | 927.1 | 610 | 265 | 284 | 88 | 282 | 32 | 700 | 20 | 3,680 | 21 | 2.74 | 4.53 | 0.85 | 34.7 | 7.7 | 0.96 | .261 | 2.76 | 5.92 |
| 17 | | K. Yates | 12.39 | 472 | 30 | 24 | .556 | 0 | 3.36 | 623 | 0 | 0 | 98 | 452.2 | 332 | 169 | 183 | 63 | 181 | 29 | 211 | 13 | 1,883 | 18 | 3.60 | 3.44 | 1.25 | 33.1 | 9.6 | 1.13 | .273 | 3.64 | 6.60 |
| 18 | | A. Nardi | 12.35 | 135 | 12 | 4 | .750 | 0 | 4.51 | 167 | 0 | 0 | 3 | 121.2 | 114 | 61 | 64 | 19 | 53 | 5 | 19 | 3 | 530 | 2 | 3.92 | 3.15 | 1.41 | 31.5 | 10.0 | 1.37 | .332 | 4.73 | 8.43 |
| 19 | | C. Marmol | 12.33 | 506 | 18 | 29 | .383 | 0 | 3.25 | 698 | 0 | 0 | 117 | 509.1 | 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 |
| 20 |  | A. Muñoz | 12.29 | 263 | 12 | 23 | .343 | 0 | 2.43 | 354 | 0 | 0 | 78 | 259.1 | 166 | 70 | 84 | 17 | 104 | 16 | 124 | 12 | 1,046 | 19 | 3.61 | 3.40 | 0.59 | 33.8 | 9.9 | 1.04 | .268 | 2.92 | 5.76 |
| 21 | | K. Giles | 12.26 | 362 | 14 | 18 | .438 | 0 | 2.71 | 484 | 0 | 0 | 115 | 355.1 | 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 |
| 22 | | B. Abreu | 12.23 | 317 | 16 | 12 | .571 | 0 | 2.65 | 448 | 0 | 0 | 16 | 329.2 | 239 | 97 | 107 | 25 | 148 | 22 | 62 | 0 | 1,369 | 20 | 4.04 | 3.03 | 0.68 | 32.7 | 10.8 | 1.17 | .295 | 2.92 | 6.52 |
| 23 | | J. Quijada | 12.18 | 142 | 4 | 14 | .222 | 0 | 4.59 | 175 | 0 | 0 | 8 | 129.1 | 99 | 66 | 73 | 19 | 86 | 12 | 32 | 8 | 576 | 4 | 5.98 | 2.03 | 1.32 | 30.4 | 14.9 | 1.43 | .282 | 5.08 | 6.89 |
| 24 | | R. Dibble | 12.17 | 385 | 27 | 25 | .519 | 0 | 2.98 | 645 | 0 | 0 | 89 | 477.0 | 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 |
| 25 | | Z. Rosscup | 12.15 | 120 | 5 | 2 | .714 | 0 | 5.09 | 117 | 0 | 0 | 0 | 86.2 | 86 | 49 | 54 | 16 | 56 | 1 | 27 | 3 | 400 | 4 | 5.82 | 2.09 | 1.66 | 29.3 | 14.0 | 1.64 | .333 | 5.61 | 8.93 |
StatMuse has game-level data for games pitched going back to the 1908 season.
Some of the information used here was obtained free of charge from Retrosheet.
More Reds Stats
Team Batting Leaders 
HR
22
De La Cruz
RBI
86
De La Cruz
AVG
.269
Lux
Team Pitching Leaders 
W
14
Singer
K
163
Singer
ERA
2.76
Greene
Team Rankings
HR
167
21st
R
716
14th
SO
1,380
13th
ERA
3.86
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Cardinals
Pirates
MLB 2025 Batting Leaders
MLB 2025 Pitching Leaders
MLB Fantasy 2025
MLB 2025 Betting
MLB 2025 Standings
| 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 |
Mets
Marlins
Braves
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 |
Rays
Orioles
Royals
Twins
White Sox
Astros
Rangers
Athletics
Angels
