highest k/9 rate for a reliever, minimum 200 games

Josh Hader has the highest K/9 by a relief pitcher when pitching in 200+ games, with 14.56 per nine innings.

NAMEK/9GWLW%GSERASOCGSHOSVIPHERRHRBBHBPGFIBBTBFWPBB/9K/BBHR/9K%BB%WHIPBABIPRAH/9
1Josh Hader
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
2Edwin Díaz
E. Díaz
14.55
527
29
36
.446
0
2.91
849
0
0
257
525.1
365
170
183
55
187
41
401
10
2,138
34
3.20
4.54
0.94
39.7
8.7
1.05
.308
3.14
6.25
3Aroldis Chapman
A. Chapman
14.53
875
60
48
.556
0
2.50
1,345
0
0
374
833.0
482
231
256
54
411
34
572
7
3,385
87
4.44
3.27
0.58
39.7
12.1
1.07
.278
2.77
5.21
4Dellin Betances
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
5Devin Williams
D. Williams
14.08
321
32
17
.653
0
2.60
483
0
0
90
308.2
189
89
108
21
143
15
133
4
1,264
17
4.17
3.38
0.61
38.2
11.3
1.08
.279
3.15
5.51
6Craig Kimbrel
C. Kimbrel
14.02
859
56
49
.533
0
2.59
1,291
0
0
440
829.0
499
239
267
75
349
40
659
12
3,336
71
3.79
3.70
0.81
38.7
10.5
1.02
.268
2.90
5.42
7Fernando Cruz
F. Cruz
13.50
200
10
14
.417
0
4.26
295
0
0
2
196.2
153
93
98
21
104
8
27
2
846
19
4.76
2.84
0.96
34.9
12.3
1.31
.316
4.48
7.00
8Andrew Miller
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
9Andrés Muñoz
A. Muñoz
12.43
279
15
26
.366
0
2.62
379
0
0
85
274.1
180
80
95
20
111
16
136
12
1,112
20
3.64
3.41
0.66
34.1
10.0
1.06
.273
3.12
5.91
10Kenley Jansen
K. Jansen
12.39
945
54
42
.563
0
2.60
1,288
0
0
481
935.2
618
270
289
91
287
32
711
20
3,717
21
2.76
4.49
0.88
34.7
7.7
0.97
.261
2.78
5.94
11Kirby Yates
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
12Carlos Marmol
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
13Bryan Abreu
B. Abreu
12.32
330
17
14
.548
0
2.89
468
0
0
17
342.0
252
110
121
29
164
23
70
0
1,434
23
4.32
2.85
0.76
32.6
11.4
1.22
.297
3.18
6.63
14Ken Giles
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
15Rob Dibble
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
16Trevor Rosenthal
T. Rosenthal
12.12
373
12
25
.324
0
3.36
490
0
0
132
364.0
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
17Alex Vesia
A. Vesia
12.05
314
17
13
.567
0
2.86
383
0
0
15
286.0
186
91
110
34
131
12
47
13
1,176
9
4.12
2.92
1.07
32.6
11.1
1.11
.247
3.46
5.85
18Corey Knebel
C. Knebel
12.05
308
13
16
.448
0
3.29
403
0
0
72
301.0
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
19Billy Wagner
B. Wagner
11.92
853
47
40
.540
0
2.31
1,196
0
0
422
903.0
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
20Brad Lidge
B. Lidge
11.92
602
26
32
.448
0
3.55
795
0
0
225
600.1
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
21David Robertson
D. Robertson
11.84
880
68
46
.596
0
2.93
1,175
0
0
179
893.1
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
22Michael Feliz
M. Feliz
11.82
227
17
8
.680
0
5.12
328
0
0
1
249.2
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
23José Leclerc
J. Leclerc
11.74
357
12
21
.364
0
3.35
477
0
0
41
365.2
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
24Liam Hendriks
L. Hendriks
11.73
446
30
21
.588
0
3.16
628
0
0
116
482.0
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
25Eric Gagne
E. Gagne
11.70
354
23
13
.639
0
2.62
492
0
0
187
378.1
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
Unlock 2x data
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.

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