mlb k/9 leaders relief pitchers 2019 to 2021 including playoffs minimum 100 innings pitched

Between the 2019 and 2021 seasons, Josh Hader had the best K/9 by a relief pitcher in the regular-season and playoffs when pitching at least 100 innings, with 15.87 per nine innings.

	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	Josh Hader J. Hader	15.87	157.2	146	8	11	.421	0	2.34	278	0	0	85	78	41	44	22	56	10	108	2	610	5	3.20	4.96	1.26	45.6	9.2	0.85	.230	2.51	4.45
2	Aroldis Chapman A. Chapman	14.73	135.0	142	11	9	.550	0	2.80	221	0	0	73	84	42	48	16	72	5	114	2	562	13	4.80	3.07	1.07	39.3	12.8	1.16	.274	3.20	5.60
3	Edwin Díaz E. Díaz	14.64	146.1	155	9	14	.391	0	4.00	238	0	0	64	119	65	69	20	59	15	118	4	621	9	3.63	4.03	1.23	38.3	9.5	1.22	.343	4.24	7.32
4	Matt Barnes M. Barnes	14.22	143.0	155	12	12	.500	0	3.84	226	0	0	37	111	61	67	20	74	6	73	5	615	20	4.66	3.05	1.26	36.7	12.0	1.29	.315	4.22	6.99
5	Liam Hendriks L. Hendriks	13.86	189.0	173	16	8	.667	0	2.14	291	0	0	78	126	45	50	19	31	3	125	7	722	13	1.48	9.39	0.90	40.3	4.3	0.83	.283	2.38	6.00
6	Lucas Sims L. Sims	13.72	101.2	89	9	3	.750	0	3.54	155	0	0	7	64	40	46	14	45	8	20	3	417	3	3.98	3.44	1.24	37.2	10.8	1.07	.256	4.07	5.67
7	Tanner Rainey T. Rainey	12.95	107.0	119	4	7	.364	0	4.88	154	0	0	3	72	58	60	17	75	8	17	4	468	11	6.31	2.05	1.43	32.9	16.0	1.37	.257	5.05	6.06
8	Nick Anderson N. Anderson	12.87	107.2	107	8	8	.500	0	3.18	154	0	0	9	82	38	39	14	27	2	17	5	428	6	2.26	5.70	1.17	36.0	6.3	1.01	.294	3.26	6.85
9	Raisel Iglesias R. Iglesias	12.69	161.2	157	14	20	.412	0	3.40	228	0	0	76	132	61	71	26	41	4	131	5	653	5	2.28	5.56	1.45	34.9	6.3	1.07	.299	3.95	7.35
10	Jake Diekman J. Diekman	12.26	149.0	171	6	10	.375	0	3.68	203	0	0	8	107	61	67	15	87	17	26	4	649	14	5.26	2.33	0.91	31.3	13.4	1.30	.281	4.05	6.46
11	Tyler Matzek T. Matzek	12.22	116.1	110	8	7	.533	0	2.40	158	0	0	0	79	31	32	5	54	4	17	6	479	8	4.18	2.93	0.39	33.0	11.3	1.14	.287	2.48	6.11
12	Amir Garrett A. Garrett	12.17	122.0	154	6	7	.462	0	4.20	165	0	0	8	101	57	61	20	71	4	28	5	531	10	5.24	2.32	1.48	31.1	13.4	1.41	.299	4.50	7.45
13	Pete Fairbanks P. Fairbanks	12.10	102.2	104	11	12	.478	0	4.12	138	0	0	10	100	47	57	13	51	3	25	2	459	14	4.47	2.71	1.14	30.1	11.1	1.47	.343	5.00	8.77
14	Taylor Rogers T. Rogers	11.97	132.1	124	6	12	.333	0	3.13	176	0	0	48	126	46	54	14	24	7	67	4	548	6	1.63	7.33	0.95	32.1	4.4	1.13	.343	3.67	8.57
15	Trevor May T. May	11.86	153.1	161	13	6	.684	0	3.29	202	0	0	8	119	56	64	23	57	3	37	5	638	12	3.35	3.54	1.35	31.7	8.9	1.15	.272	3.76	6.98
16	Héctor Neris H. Neris	11.77	163.2	166	9	15	.375	0	3.46	214	0	0	45	124	63	73	22	69	10	91	6	688	9	3.79	3.10	1.21	31.1	10.0	1.18	.273	4.01	6.82
17	Will Smith W. Smith	11.69	166.1	170	15	10	.600	0	3.08	216	0	0	77	113	57	58	29	59	5	124	4	665	6	3.19	3.66	1.57	32.5	8.9	1.03	.236	3.14	6.11
18	Kenley Jansen K. Jansen	11.67	172.0	176	14	9	.609	0	2.93	223	0	0	85	115	56	65	16	64	9	141	5	702	6	3.35	3.48	0.84	31.8	9.1	1.04	.254	3.40	6.02
19	Ryan Pressly R. Pressly	11.67	162.0	168	10	9	.526	0	2.67	210	0	0	46	132	48	55	13	38	2	86	3	650	12	2.11	5.53	0.72	32.3	5.8	1.05	.307	3.06	7.33
20	Tanner Scott T. Scott	11.58	101.0	115	6	5	.545	0	4.28	130	0	0	1	88	48	56	11	66	11	23	3	459	16	5.88	1.97	0.98	28.3	14.4	1.52	.320	4.99	7.84
21	Heath Hembree H. Hembree	11.49	116.2	127	6	7	.462	0	5.55	149	0	0	11	105	72	78	28	50	7	37	3	506	4	3.86	2.98	2.16	29.4	9.9	1.33	.283	6.02	8.10
22	Brandon Workman B. Workman	11.46	119.1	123	12	7	.632	0	3.39	152	0	0	25	96	45	52	9	79	2	54	8	523	5	5.96	1.92	0.68	29.1	15.1	1.47	.310	3.92	7.24
23	Matt Wisler M. Wisler	11.45	110.0	100	6	10	.375	0	4.66	140	0	0	2	108	57	63	19	34	2	18	1	469	5	2.78	4.12	1.55	29.9	7.2	1.29	.325	5.15	8.84
24	Scott Barlow S. Barlow	11.44	174.2	164	10	7	.588	0	3.45	222	0	0	19	152	67	67	14	74	7	42	7	741	11	3.81	3.00	0.72	30.0	10.0	1.29	.325	3.45	7.83
25	Joe Jiménez J. Jiménez	11.35	127.2	143	11	11	.500	0	5.43	161	0	0	15	115	77	85	26	64	17	50	2	568	8	4.51	2.52	1.83	28.3	11.3	1.40	.297	5.99	8.11