highest bb/9 by reliever since 2010 (min 200 ip and max 3 era)

Since 2010, Aroldis Chapman has walked the best walks per nine innings by a relief pitcher when pitching at least 200 innings with an ERA of 3.00 or better, with 4.47 BB/9.

	NAME	BB/9	IP	ERA	G	W	L	W%	GS	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Aroldis Chapman A. Chapman	4.47	821.1	2.52	863	60	47	.561	0	1,331	0	0	367	475	230	255	54	408	33	563	7	3,341	87	14.58	3.26	0.59	39.8	12.2	1.08	.278	2.79	5.20
2	Jonny Venters J. Venters	4.44	271.2	2.55	291	20	12	.625	0	296	0	0	10	210	77	98	13	134	21	52	16	1,157	20	9.81	2.21	0.43	25.6	11.6	1.27	.284	3.25	6.96
3	Dellin Betances D. Betances	4.15	392.1	2.55	373	21	23	.477	0	631	0	0	36	239	111	124	26	181	28	86	5	1,604	28	14.47	3.49	0.60	39.3	11.3	1.07	.289	2.84	5.48
4	Devin Williams D. Williams	4.14	297.2	2.45	308	31	16	.660	0	465	0	0	86	174	81	100	20	137	15	126	4	1,211	17	14.06	3.39	0.60	38.4	11.3	1.04	.268	3.02	5.26
5	Alex Vesia A. Vesia	4.12	273.1	2.93	299	17	13	.567	0	367	0	0	13	182	89	108	34	125	12	44	13	1,128	9	12.08	2.94	1.12	32.5	11.1	1.12	.251	3.56	5.99
6	Bryan Abreu B. Abreu	4.04	329.2	2.65	317	16	12	.571	0	448	0	0	16	239	97	107	25	148	22	62	0	1,369	20	12.23	3.03	0.68	32.7	10.8	1.17	.295	2.92	6.52
7	Jordan Walden J. Walden	3.89	222.0	3.00	243	12	14	.462	0	266	0	0	39	176	74	78	13	96	2	86	10	930	31	10.78	2.77	0.53	28.6	10.3	1.23	.295	3.16	7.14
8	Vinnie Pestano V. Pestano	3.86	202.2	2.98	223	6	8	.429	0	244	0	0	11	168	67	73	24	87	9	67	7	856	6	10.84	2.80	1.07	28.5	10.2	1.26	.293	3.24	7.46
9	Grant Balfour G. Balfour	3.84	321.1	3.00	330	13	14	.481	0	316	0	0	76	228	107	111	26	137	3	147	10	1,306	20	8.85	2.31	0.73	24.2	10.5	1.14	.245	3.11	6.39
10	Jacob Webb J. Webb	3.81	253.0	2.99	247	17	14	.548	0	244	0	0	7	197	84	103	28	107	9	56	11	1,060	7	8.68	2.28	1.00	23.0	10.1	1.20	.251	3.66	7.01
11	Jesse Crain J. Crain	3.80	218.0	2.39	227	13	10	.565	0	238	0	0	2	163	58	67	17	92	3	38	11	892	7	9.83	2.59	0.70	26.7	10.3	1.17	.269	2.77	6.73
12	Javier Lopez J. Lopez	3.79	289.2	2.52	496	19	10	.655	0	206	0	0	10	233	81	91	10	122	9	102	26	1,203	9	6.40	1.69	0.31	17.1	10.1	1.23	.261	2.83	7.24
13	Craig Kimbrel C. Kimbrel	3.79	821.2	2.58	851	56	48	.538	0	1,282	0	0	440	492	236	263	75	346	40	656	11	3,306	70	14.04	3.71	0.82	38.8	10.5	1.02	.267	2.88	5.39
14	Ryan Helsley R. Helsley	3.72	319.2	2.96	297	31	18	.633	0	377	0	0	105	243	105	118	30	132	3	171	13	1,314	21	10.61	2.86	0.84	28.7	10.0	1.17	.276	3.32	6.84
15	Joel Hanrahan J. Hanrahan	3.68	205.1	2.98	214	10	8	.556	0	233	0	0	86	164	68	71	19	84	6	149	2	859	18	10.21	2.77	0.83	27.1	9.8	1.21	.280	3.11	7.19
16	Santiago Casilla S. Casilla	3.66	485.0	2.69	503	36	27	.571	0	445	0	0	140	379	145	158	38	197	30	257	22	2,010	39	8.26	2.26	0.71	22.1	9.8	1.19	.262	2.93	7.03
17	Steve Cishek S. Cishek	3.65	710.2	2.98	737	33	43	.434	0	743	0	0	133	565	235	264	54	288	59	312	38	2,993	29	9.41	2.58	0.68	24.8	9.6	1.20	.276	3.34	7.16
18	Andrés Muñoz A. Muñoz	3.61	259.1	2.43	263	12	23	.343	0	354	0	0	78	166	70	84	17	104	16	124	12	1,046	19	12.29	3.40	0.59	33.8	9.9	1.04	.268	2.92	5.76
19	David Robertson D. Robertson	3.58	819.1	2.82	810	62	45	.579	0	1,076	0	0	178	609	257	278	74	326	24	330	35	3,365	45	11.82	3.30	0.81	32.0	9.7	1.14	.287	3.05	6.69
20	Blake Treinen B. Treinen	3.53	540.1	2.90	524	44	38	.537	0	580	0	0	82	451	174	198	42	212	19	197	25	2,236	24	9.66	2.74	0.70	25.9	9.5	1.23	.296	3.30	7.51
21	Zack Britton Z. Britton	3.52	391.0	2.03	396	17	9	.654	0	367	0	0	154	276	88	102	17	153	8	250	6	1,551	36	8.45	2.40	0.39	23.7	9.9	1.10	.257	2.35	6.35
22	Josh Hader J. Hader	3.48	512.1	2.64	468	34	31	.523	0	829	0	0	226	282	150	164	65	198	24	321	6	2,019	19	14.56	4.19	1.14	41.1	9.8	0.94	.240	2.88	4.95
23	Jason Adam J. Adam	3.33	335.0	2.69	341	27	15	.643	0	390	0	0	24	220	100	115	34	124	33	77	11	1,352	14	10.48	3.15	0.91	28.8	9.2	1.03	.241	3.09	5.91
24	Andrew Miller A. Miller	3.33	481.1	2.77	523	34	26	.567	0	705	0	0	63	331	148	163	45	178	43	142	9	1,978	21	13.18	3.96	0.84	35.6	9.0	1.06	.284	3.05	6.19
25	Drew Pomeranz D. Pomeranz	3.23	206.1	2.31	202	9	8	.529	0	252	0	0	10	149	53	62	18	74	9	41	4	830	3	10.99	3.41	0.79	30.4	8.9	1.08	.275	2.70	6.50