lowest career era by a relief pitcher with at least 600 ip in relief

Mariano Rivera has the lowest career ERA by a relief pitcher when pitching at least 600 innings, with an ERA of 2.06.

	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	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
2	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
3	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
4	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
5	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
6	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
7	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
8	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
9	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
10	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
11	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
12	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
13	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
14	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
15	Raisel Iglesias R. Iglesias	2.74	615.1	579	38	47	.447	0	738	0	0	253	462	187	212	68	168	20	459	17	2,461	16	10.79	2.46	4.39	0.99	30.0	6.8	1.02	.269	3.10	6.76
16	Brad Ziegler B. Ziegler	2.75	717.1	739	37	38	.493	0	479	0	0	105	654	219	251	32	248	25	264	55	2,947	7	6.01	3.11	1.93	0.40	16.3	8.4	1.26	.288	3.15	8.21
17	Tim Burke T. Burke	2.75	687.2	496	48	33	.593	0	433	0	0	102	612	210	250	49	218	21	262	70	2,860	25	5.67	2.85	1.99	0.64	15.1	7.6	1.21	.263	3.27	8.01
18	Bob Locker B. Locker	2.75	879.0	576	57	39	.594	0	577	0	0	95	776	269	329	40	258	36	288	80	3,639	37	5.91	2.64	2.24	0.41	15.9	7.1	1.18	.270	3.37	7.95
19	Dan Quisenberry D. Quisenberry	2.76	1043.1	674	56	46	.549	0	379	0	0	244	1,064	320	356	59	162	7	553	70	4,247	4	3.27	1.40	2.34	0.51	8.9	3.8	1.18	.276	3.07	9.18
20	Rich Gossage R. Gossage	2.77	1556.2	965	115	85	.575	0	1,340	0	0	310	1,235	479	537	98	628	38	681	87	6,408	56	7.75	3.63	2.13	0.57	20.9	9.8	1.20	.264	3.10	7.14
21	John Hiller J. Hiller	2.78	963.0	502	72	57	.558	0	831	0	0	125	792	297	334	82	439	11	363	69	4,054	33	7.77	4.10	1.89	0.77	20.5	10.8	1.28	.264	3.12	7.40
22	Ron Perranoski R. Perranoski	2.78	1170.2	736	79	74	.516	0	685	0	0	178	1,091	362	440	48	467	24	458	121	5,002	28	5.27	3.59	1.47	0.37	13.7	9.3	1.33	.276	3.38	8.39
23	Ellis Kinder E. Kinder	2.79	610.2	362	45	29	.608	0	312	0	0	104	537	189	215	39	220	4	255	8	2,549	9	4.60	3.24	1.42	0.57	12.2	8.6	1.24	.252	3.17	7.91
24	Jim Brewer J. Brewer	2.80	860.2	549	62	49	.559	0	698	0	0	133	703	268	303	72	304	9	351	69	3,524	38	7.30	3.18	2.30	0.75	19.8	8.6	1.17	.259	3.17	7.35
25	Clay Carroll C. Carroll	2.82	1204.2	703	88	66	.571	0	613	0	0	143	1,141	377	438	57	397	35	373	105	5,047	38	4.58	2.97	1.54	0.43	12.1	7.9	1.28	.275	3.27	8.52