who has the lowest career era- with a minimum of 500 ip

Mariano Rivera has the lowest career ERA- when pitching at least 500 innings, with an ERA- of 49.

	NAME	ERA-	IP	G	W	L	W%	GS	ERA	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	FIP	FIP-	H/9	PRAA
1	Mariano Rivera M. Rivera	49	1283.2	1,115	82	60	.577	10	2.21	1,173	0	0	652	998	315	340	71	286	46	952	41	5,103	13	8.22	2.01	4.10	0.50	23.0	5.6	1.00	.263	2.38	2.76	61	7.00	246.7
2	Billy Wagner B. Wagner	54	903.0	853	47	40	.540	0	2.31	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	2.72	63	5.99	159
3	Jonathan Papelbon J. Papelbon	58	725.2	689	41	36	.532	3	2.44	808	0	0	368	572	197	226	57	185	34	585	18	2,938	14	10.02	2.29	4.37	0.71	27.5	6.3	1.04	.278	2.80	2.80	69	7.09	105.2
4	Darren O'Day D. O'Day	61	609.0	644	42	21	.667	0	2.59	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	3.48	82	6.77	52.4
5	Aroldis Chapman A. Chapman	61	821.1	863	60	47	.561	0	2.52	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	2.36	57	5.20	161.8
6	Craig Kimbrel C. Kimbrel	63	821.2	851	56	48	.538	0	2.58	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	2.60	64	5.39	131.8
7	Tom Henke T. Henke	64	789.2	642	41	42	.494	0	2.67	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	2.71	66	6.92	123.5
8	Josh Hader J. Hader	64	512.1	468	34	31	.523	0	2.64	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	2.88	69	4.95	75.7
9	Clayton Kershaw C. Kershaw	65	2855.1	455	223	96	.699	451	2.53	3,052	25	15	0	2,193	804	881	235	713	46	1	28	11,279	108	9.62	2.25	4.28	0.74	27.1	6.3	1.02	.271	2.78	2.85	70	6.91	375.1
10	Kenley Jansen K. Jansen	65	927.1	934	54	40	.574	0	2.57	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	2.62	64	5.92	147.2
11	Jacob deGrom J. deGrom	66	1539.2	248	96	65	.596	248	2.57	1,851	4	2	0	1,173	440	477	146	345	25	0	13	6,045	30	10.82	2.02	5.37	0.85	30.6	5.7	0.99	.279	2.79	2.70	66	6.86	239.4
12	Pedro Martinez P. Martinez	66	2827.1	476	219	100	.687	409	2.93	3,154	46	17	3	2,221	919	1,006	239	760	141	23	30	11,394	62	10.04	2.42	4.15	0.76	27.7	6.7	1.05	.279	3.20	2.91	68	7.07	454.6
13	Joe Nathan J. Nathan	67	923.1	787	64	34	.653	29	2.87	976	0	0	377	690	294	317	84	344	23	587	31	3,771	47	9.51	3.35	2.84	0.82	25.9	9.1	1.12	.259	3.09	3.35	78	6.73	93.6
14	Jim Devlin J. Devlin	67	1181.0	129	65	60	.520	129	1.89	263	127	9	0	1,183	248	597	7	78		0		4,896	34	2.00	0.59	3.37	0.05	5.4	1.6	1.07		4.55	2.35	84	9.02	88.9
15	Walter Johnson W. Johnson	68	5914.1	802	417	279	.599	666	2.17	3,509	531	110	34	4,913	1,424	1,902	97	1,363	205	127		23,405	154	5.34	2.07	2.57	0.15	15.0	5.8	1.06	.264	2.89	2.42	76	7.48	472.8
16	Brad Ziegler B. Ziegler	68	717.1	739	37	38	.493	0	2.75	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	3.49	87	8.21	41.9
17	Lefty Grove L. Grove	68	3940.2	616	300	141	.680	457	3.06	2,266	298	35	54	3,849	1,339	1,594	162	1,187	42	123		16,622	51	5.18	2.71	1.91	0.37	13.6	7.1	1.28	.284	3.64	3.36	76	8.79	462.8
18	Hoyt Wilhelm H. Wilhelm	68	2254.1	1,070	143	122	.540	52	2.52	1,610	20	5	228	1,757	632	773	150	778	62	651	61	9,164	90	6.43	3.11	2.07	0.60	17.6	8.5	1.12	.245	3.09	3.06	82	7.01	167.6
19	Francisco Rodriguez F. Rodriguez	69	976.0	948	52	53	.495	0	2.86	1,142	0	0	437	738	310	336	98	389	17	677	42	4,011	68	10.53	3.59	2.94	0.90	28.5	9.7	1.15	.271	3.10	3.30	79	6.81	97
20	Raisel Iglesias R. Iglesias	69	736.0	600	42	55	.433	21	2.92	869	0	0	253	570	239	265	83	202	27	459	17	2,962	17	10.63	2.47	4.30	1.01	29.3	6.8	1.05	.273	3.24	3.19	76	6.97	82.7
21	Ed Walsh E. Walsh	69	2964.1	430	195	126	.607	315	1.82	1,736	250	57	35	2,346	598	873	23	617	52	105		11,413	76	5.27	1.87	2.81	0.07	15.2	5.4	1.00	.259	2.65	2.02	79	7.12	164.3
22	Dan Quisenberry D. Quisenberry	69	1043.1	674	56	46	.549	0	2.76	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	3.23	82	9.18	81.6
23	Troy Percival T. Percival	69	708.2	703	35	43	.449	1	3.17	781	0	0	358	479	250	271	85	306	27	546	25	2,915	32	9.92	3.89	2.55	1.08	26.8	10.5	1.11	.230	3.44	3.86	85	6.08	56.9
24	Joe Wood J. Wood	70	1434.1	225	117	57	.672	158	2.03	989	121	28	10	1,138	324	497	10	421	49	56		5,640	43	6.21	2.64	2.35	0.06	17.5	7.5	1.09	.270	3.12	2.26	78	7.14	105.8
25	Addie Joss A. Joss	70	2327.0	286	160	97	.623	260	1.89	920	234	45	5	1,888	488	730	19	364	58	22		8,891	28	3.56	1.41	2.53	0.07	10.3	4.1	0.97	.248	2.82	2.25	86	7.30	88.8