lowest career era by a relief pitcher with at least 400 ip in relief

Mordecai Brown has the best career ERA by a relief pitcher when pitching at least 400 innings, with an ERA of 0.97.

	NAME	ERA	IP	G	W	L	W%	GS	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Mordecai Brown M. Brown	0.97	426.2	149	39	20	.661	0	225	0	0	38	362		157	7	87	9	139			17	4.75	1.84	2.59	0.15		6.1	1.05	.325	3.31	7.64
2	Doc Crandall D. Crandall	1.70	514.0	169	33	15	.688	0	231	0	0	25	474		223	16	129	15	147			2	4.04	2.26	1.79	0.28		7.4	1.17	.338	3.90	8.30
3	Red Ames R. Ames	1.87	424.0	162	23	16	.590	0	240	0	0	32	384		180	3	160	8	118		1,745	36	5.09	3.40	1.50	0.06	13.8	9.2	1.28	.286	3.82	8.15
4	Mariano Rivera M. Rivera	2.06	1233.2	1,105	79	57	.581	0	1,135	0	0	652	934	282	305	63	266	44	952	41	4,870	13	8.28	1.94	4.27	0.46	23.3	5.5	0.97	.259	2.23	6.81
5	Billy Wagner B. Wagner	2.31	903.0	853	47	40	.540	0	1,196	0	0	422	601	232	262	82	300	33	703	26	3,600	43	11.92	2.99	3.99	0.82	33.2	8.3	1.00	.261	2.61	5.99
6	Slim Sallee S. Sallee	2.40	454.2	170	29	21	.580	0	159	0	0	35	434		197	13	105	8	125		1,869	4	3.15	2.08	1.51	0.26	8.5	5.6	1.19	.266	3.90	8.59
7	Mike Adams M. Adams	2.41	407.1	408	21	20	.512	0	409	0	0	4	316	109	122	33	126	6	60	12	1,653	7	9.04	2.78	3.25	0.73	24.7	7.6	1.09	.262	2.70	6.98
8	Koji Uehara K. Uehara	2.43	414.0	424	20	22	.476	0	524	0	0	95	279	112	120	53	66	4	207	8	1,583	9	11.39	1.43	7.94	1.15	33.1	4.2	0.83	.241	2.61	6.07
9	Jonathan Papelbon J. Papelbon	2.45	709.2	686	41	36	.532	0	793	0	0	368	557	193	221	55	175	32	585	17	2,867	13	10.06	2.22	4.53	0.70	27.7	6.1	1.03	.277	2.80	7.06
10	Hoyt Wilhelm H. Wilhelm	2.49	1872.1	1,018	124	103	.546	0	1,363	0	0	228	1,436	518	636	125	661	51	651	58	7,619	83	6.55	3.18	2.06	0.60	17.9	8.7	1.12	.242	3.06	6.90
11	Joe Nathan J. Nathan	2.50	761.0	758	52	29	.642	0	881	0	0	377	540	211	222	60	248	18	587	27	3,048	41	10.42	2.93	3.55	0.71	28.9	8.1	1.04	.261	2.63	6.39
12	Aroldis Chapman A. Chapman	2.52	821.1	863	60	47	.561	0	1,331	0	0	367	475	230	255	54	408	33	563	7	3,341	87	14.58	4.47	3.26	0.59	39.8	12.2	1.08	.278	2.79	5.20
13	Jack Quinn J. Quinn	2.55	708.2	313	54	32	.628	0	272	0	0	56	769		333	17	184	16	218			18	3.45	2.34	1.48	0.22		6.6	1.34	.328	4.23	9.77
14	Kenley Jansen K. Jansen	2.57	927.1	934	54	40	.574	0	1,278	0	0	475	610	265	284	88	282	32	700	20	3,680	21	12.40	2.74	4.53	0.85	34.7	7.7	0.96	.261	2.76	5.92
15	Craig Kimbrel C. Kimbrel	2.58	821.2	851	56	48	.538	0	1,282	0	0	440	492	236	263	75	346	40	656	11	3,306	70	14.04	3.79	3.71	0.82	38.8	10.5	1.02	.267	2.88	5.39
16	Darren O'Day D. O'Day	2.59	609.0	644	42	21	.667	0	637	0	0	21	458	175	189	64	172	50	155	24	2,461	3	9.41	2.54	3.70	0.95	25.9	7.0	1.03	.256	2.79	6.77
17	John Wetteland J. Wetteland	2.62	683.0	601	46	36	.561	0	730	0	0	330	537	199	230	63	221	12	523	27	2,793	28	9.62	2.91	3.30	0.83	26.1	7.9	1.11	.268	3.03	7.08
18	Josh Hader J. Hader	2.64	512.1	468	34	31	.523	0	829	0	0	226	282	150	164	65	198	24	321	6	2,019	19	14.56	3.48	4.19	1.14	41.1	9.8	0.94	.240	2.88	4.95
19	Dave Smith D. Smith	2.64	807.1	608	53	53	.500	0	548	0	0	216	696	237	277	34	281	13	432	64	3,345	28	6.11	3.13	1.95	0.38	16.4	8.4	1.21	.268	3.09	7.76
20	Tom Henke T. Henke	2.67	789.2	642	41	42	.494	0	861	0	0	311	607	234	252	64	255	9	548	29	3,194	30	9.81	2.91	3.38	0.73	27.0	8.0	1.09	.271	2.87	6.92
21	Bob Lee B. Lee	2.67	457.2	262	23	22	.511	0	296	0	0	64	369	136	158	29	183	5	152	34	1,898	11	5.82	3.60	1.62	0.57	15.6	9.6	1.21	.245	3.11	7.26
22	Scott Downs S. Downs	2.68	504.0	569	26	26	.500	0	400	0	0	27	423	150	165	33	182	16	113	28	2,090	21	7.14	3.25	2.20	0.59	19.1	8.7	1.20	.267	2.95	7.55
23	Wilbur Wood W. Wood	2.71	565.0	354	33	36	.478	0	322	0	0	57	502	170	209	38	172	12	198	44	2,331	21	5.13	2.74	1.87	0.61	13.8	7.4	1.19	.260	3.33	8.00
24	Billy O'Dell B. O'Dell	2.71	498.1	280	32	26	.552	0	347	0	0	50	433	150	183	36	180	16	137	33	2,092	14	6.27	3.25	1.93	0.65	16.6	8.6	1.23	.262	3.31	7.82
25	Rollie Fingers R. Fingers	2.73	1505.2	907	107	101	.514	0	1,183	0	0	341	1,276	456	502	97	429	29	709	105	6,104	37	7.07	2.56	2.76	0.58	19.4	7.0	1.13	.270	3.00	7.63