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

Aroldis Chapman has the highest K/9 by a relief pitcher when pitching in 200+ games, with 14.58 per nine innings.

NAMEK/9GWLW%GSERASOCGSHOSVIPHERRHRBBHBPGFIBBTBFWPBB/9K/BBHR/9K%BB%WHIPBABIPRAH/9
1Aroldis Chapman
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
2Josh 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
3Edwin Díaz
E. Díaz
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
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
14.06
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
6Craig Kimbrel
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
7Andrew 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
8Kenley Jansen
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
9Kirby 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
10Carlos 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
11Andrés Muñoz
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
12Ken 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
13Bryan Abreu
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
14Rob 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
15Trevor 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
16Alex Vesia
A. Vesia
12.08
299
17
13
.567
0
2.93
367
0
0
13
273.1
182
89
108
34
125
12
44
13
1,128
9
4.12
2.94
1.12
32.5
11.1
1.12
.251
3.56
5.99
17Corey 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
18Billy 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
19Brad 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
20David 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
21Michael 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
22José 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
23Liam 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
24Eric 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
25John Rocker
J. Rocker
11.70
280
13
22
.371
0
3.42
332
0
0
88
255.1
200
97
115
23
164
12
176
17
1,130
29
5.78
2.02
0.81
29.4
14.5
1.43
.295
4.05
7.05
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Some of the information used here was obtained free of charge from Retrosheet.

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