most strikeouts per 9 innings in mlb relievers all-time in minimum 15 games pitched

Rafael Martin had the highest K/9 by a relief pitcher when pitching in 15+ games, with 16.88 per nine innings.

	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	Rafael Martin R. Martin	16.88	21	2	0	1.000	0	4.50	30	0	0	0	16.0	12	8	10	4	6	1	7	0	68	0	3.38	5.00	2.25	44.1	8.8	1.13	.296	5.63	6.75
2	Randy Johnson R. Johnson	15.87	15	2	0	1.000	0	2.51	57	0	0	2	32.1	26	9	11	3	6	2	7	0	130	0	1.67	9.50	0.84	43.8	4.6	0.99	.371	3.06	7.24
3	Aroldis 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
4	Josh 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
5	Edwin 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
6	Mason Miller 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
7	Dellin 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
8	Devin 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
9	Craig 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
10	Michel Otañez M. Otañez	13.96	42	1	0	1.000	0	4.81	61	0	0	1	39.1	34	21	23	4	25	4	7	0	179	6	5.72	2.44	0.92	34.1	14.0	1.50	.353	5.26	7.78
11	Félix Bautista 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
12	Darwinzon Hernandez D. Hernandez	13.77	90	3	3	.500	0	4.92	126	0	0	0	82.1	72	45	50	10	68	11	9	1	394	8	7.43	1.85	1.09	32.0	17.3	1.70	.346	5.47	7.87
13	Josh James J. James	13.77	67	6	1	.857	0	4.70	129	0	0	1	84.1	65	44	46	14	44	6	24	0	363	8	4.70	2.93	1.49	35.5	12.1	1.29	.300	4.91	6.94
14	James Karinchak 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
15	Angel Perdomo A. Perdomo	13.67	56	4	2	.667	0	5.54	79	0	0	0	52.0	38	32	35	7	37	7	17	6	231	1	6.40	2.14	1.21	34.2	16.0	1.44	.307	6.06	6.58
16	Freddy Peralta F. Peralta	13.61	49	8	2	.800	0	3.86	127	0	0	1	84.0	67	36	41	9	41	2	6	1	360	2	4.39	3.10	0.96	35.3	11.4	1.29	.320	4.39	7.18
17	Fernando Cruz 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
18	Michael Soroka M. Soroka	13.50	22	0	5	.000	0	2.58	68	0	0	0	45.1	30	13	22	4	24	3	8	1	193	2	4.76	2.83	0.79	35.2	12.4	1.19	.277	4.37	5.96
19	Brian Moran B. Moran	13.50	18	2	0	1.000	0	7.94	17	0	0	0	11.1	15	10	10	3	9	2	2	2	60	0	7.15	1.89	2.38	28.3	15.0	2.12	.414	7.94	11.91
20	Brad Wieck B. Wieck	13.42	65	2	2	.500	0	3.77	89	0	0	0	59.2	42	25	26	10	24	3	10	0	248	1	3.62	3.71	1.51	35.9	9.7	1.11	.262	3.92	6.34
21	Jeremiah Estrada 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
22	Grant Taylor G. Taylor	13.24	34	2	3	.400	0	4.67	51	0	0	6	34.2	35	18	18	0	14	0	10	1	148	5	3.63	3.64	0.00	34.5	9.5	1.41	.422	4.67	9.09
23	Erik Sabrowski E. Sabrowski	13.07	41	0	1	.000	0	1.29	61	0	0	1	42.0	20	6	8	2	25	3	7	0	168	1	5.36	2.44	0.43	36.3	14.9	1.07	.234	1.71	4.29
24	Nick Burdi N. Burdi	13.05	35	3	2	.600	0	5.34	44	0	0	1	30.1	29	18	19	3	21	2	12	0	141	6	6.23	2.10	0.89	31.2	14.9	1.65	.366	5.64	8.60
25	Dillon Maples D. Maples	13.01	59	3	0	1.000	0	5.10	79	0	0	0	54.2	35	31	33	6	50	14	16	0	258	8	8.23	1.58	0.99	30.6	19.4	1.55	.266	5.43	5.76