lowest career era since 1920 with at least 500 innings pitched

Since 1920, Mariano Rivera has the lowest ERA when pitching at least 500 innings, with an ERA of 2.21.

Interpreted as:

lowest career era by a player since 1920 with at least 500 innings pitched

	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	ERA-	FIP	FIP-	H/9	PRAA
1	Mariano Rivera M. Rivera	2.21	1283.2	1,115	82	60	.577	10	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	49	2.76	61	7.00	246.7
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	54	2.72	63	5.99	159
3	Jonathan Papelbon J. Papelbon	2.44	725.2	689	41	36	.532	3	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	58	2.80	69	7.09	105.2
4	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	61	2.36	57	5.20	161.8
5	Hoyt Wilhelm H. Wilhelm	2.52	2254.1	1,070	143	122	.540	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	68	3.06	82	7.01	167.6
6	Clayton Kershaw C. Kershaw	2.53	2855.1	455	223	96	.699	451	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	65	2.85	70	6.91	375.1
7	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	65	2.62	64	5.92	147.2
8	Jacob deGrom J. deGrom	2.57	1539.2	248	96	65	.596	248	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	66	2.70	66	6.86	239.4
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	63	2.60	64	5.39	131.8
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	61	3.48	82	6.77	52.4
11	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	64	2.88	69	4.95	75.7
12	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	64	2.71	66	6.92	123.5
13	Dave Smith D. Smith	2.67	809.1	609	53	53	.500	1	548	0	0	216	700	240	280	34	283	13	432	64	3,357	28	6.09	3.15	1.94	0.38	16.3	8.4	1.21	.269	3.11	77	3.03	87	7.78	40.2
14	Tim Burke T. Burke	2.72	699.1	498	49	33	.598	2	444	0	0	102	624	211	251	49	219	21	262	71	2,906	25	5.71	2.82	2.03	0.63	15.3	7.5	1.21	.265	3.23	75	3.45	93	8.03	19.9
15	Whitey Ford W. Ford	2.75	3170.1	498	236	106	.690	438	1,956	156	45	11	2,766	967	1,107	228	1,086	28	35	44	13,036	75	5.55	3.08	1.80	0.65	15.0	8.3	1.22	.261	3.14	75	3.26	88	7.85	156.9
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	68	3.49	87	8.21	41.9
17	Bob Locker B. Locker	2.75	879.0	576	57	39	.594	0	577	0	0	95	776	269	329	40	257	36	288	80	3,643	37	5.91	2.63	2.25	0.41	15.8	7.1	1.18	.269	3.37	82	2.79	80	7.95	68.1
18	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	69	3.23	82	9.18	81.6
19	Sandy Koufax S. Koufax	2.76	2324.1	397	165	87	.655	314	2,396	137	40	9	1,754	713	806	204	817	18	44	48	9,497	87	9.28	3.16	2.93	0.79	25.2	8.6	1.11	.256	3.12	75	2.69	75	6.79	226.6
20	Ron Perranoski R. Perranoski	2.79	1174.2	737	79	74	.516	1	687	0	0	178	1,097	364	442	50	468	24	458	121	5,023	28	5.26	3.59	1.47	0.38	13.7	9.3	1.33	.276	3.39	82	3.17	93	8.40	30.6
21	Edwin Díaz E. Díaz	2.82	519.1	520	28	36	.438	0	839	0	0	253	356	163	176	54	182	40	395	9	2,105	33	14.54	3.15	4.61	0.94	39.9	8.6	1.04	.305	3.05	70	2.55	61	6.17	93.4
22	Bruce Sutter B. Sutter	2.83	1042.0	661	68	71	.489	0	861	0	0	300	879	328	370	77	309	13	512	83	4,251	37	7.44	2.67	2.79	0.67	20.3	7.3	1.14	.268	3.20	75	2.93	80	7.59	88
23	John Hiller J. Hiller	2.83	1242.0	545	87	76	.534	43	1,036	13	6	125	1,040	391	438	110	535	12	363	71	5,206	39	7.51	3.88	1.94	0.80	19.9	10.3	1.27	.265	3.17	75	3.38	89	7.54	58.9
24	Spud Chandler S. Chandler	2.84	1485.0	211	109	43	.717	184	614	109	26	6	1,327	468	549	64	463	19	14		6,102	20	3.72	2.81	1.33	0.39	10.1	7.6	1.21	.256	3.33	73	3.30	88	8.04	71.2
25	Kent Tekulve K. Tekulve	2.85	1436.2	1,050	94	90	.511	0	779	0	0	184	1,305	455	526	63	491	17	638	179	6,001	23	4.88	3.08	1.59	0.39	13.0	8.2	1.25	.267	3.30	77	3.25	88	8.18	71.1