Since 2000, Shane Bieber has the best ERA in a season, with an ERA of 1.63 in 2020.

Interpreted as:

MLB best era with a minimum of 1 IP per team game by a player single season since 2000

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	IP	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	Shane Bieber S. Bieber	1.63	2020	CLE	12	8	1	.889	12	122	0	0	0	77.1	46	14	15	7	21	1	0	0	297	5	14.20	2.44	5.81	0.81	41.1	7.1	0.87	.267	1.75	37	2.06	46	5.35	20.5
2	Zack Greinke Z. Greinke	1.66	2015	LAD	32	19	3	.864	32	200	1	0	0	222.2	148	41	43	14	40	5	0	1	843	7	8.08	1.62	5.00	0.57	23.7	4.7	0.84	.229	1.74	44	2.75	73	5.98	26.2
3	Jacob deGrom J. deGrom	1.70	2018	NYM	32	10	9	.526	32	269	1	0	0	217.0	152	41	48	10	46	5	0	3	835	2	11.16	1.91	5.85	0.41	32.2	5.5	0.91	.281	1.99	44	1.98	50	6.30	49
4	Trevor Bauer T. Bauer	1.73	2020	CIN	11	5	4	.556	11	100	2	2	0	73.0	41	14	17	9	17	3	0	1	278	3	12.33	2.10	5.88	1.11	36.0	6.1	0.79	.215	2.10	36	2.87	61	5.05	14.1
5	Pedro Martinez P. Martinez	1.74	2000	BOS	29	18	6	.750	29	284	7	4	0	217.0	128	42	44	17	32	14	0	0	817	1	11.78	1.33	8.88	0.71	34.8	3.9	0.74	.236	1.82	35	2.16	47	5.31	61.5
6	Justin Verlander J. Verlander	1.75	2022	HOU	28	18	4	.818	28	185	0	0	0	175.0	116	34	43	12	29	6	0	0	666	3	9.51	1.49	6.38	0.62	27.8	4.4	0.83	.240	2.21	46	2.48	64	5.97	27.7
7	Jake Arrieta J. Arrieta	1.77	2015	CHC	33	22	6	.786	33	236	4	3	0	229.0	150	45	52	10	48	6	0	2	870	6	9.28	1.89	4.92	0.39	27.1	5.5	0.86	.246	2.04	45	2.34	60	5.90	39
8	Clayton Kershaw C. Kershaw	1.77	2014	LAD	27	21	3	.875	27	239	6	2	0	198.1	139	39	42	9	31	2	0	0	749	7	10.85	1.41	7.71	0.41	31.9	4.1	0.86	.278	1.91	51	1.81	50	6.31	40.5
9	Clayton Kershaw C. Kershaw	1.83	2013	LAD	33	16	9	.640	33	232	3	2	0	236.0	164	48	55	11	52	3	0	2	908	12	8.85	1.98	4.46	0.42	25.6	5.7	0.92	.251	2.10	51	2.38	64	6.25	35.4
10	Roger Clemens R. Clemens	1.87	2005	HOU	32	13	8	.619	32	185	1	0	0	211.1	151	44	51	11	62	3	0	5	838	3	7.88	2.64	2.98	0.47	22.1	7.4	1.01	.243	2.17	44	2.86	67	6.43	33.4
11	Blake Snell B. Snell	1.89	2018	TBR	31	21	5	.808	31	221	0	0	0	180.2	112	38	41	16	64	1	0	2	700	13	11.01	3.19	3.45	0.80	31.6	9.1	0.97	.241	2.04	46	2.94	72	5.58	23.1
12	Paul Skenes P. Skenes	1.97	2025	PIT	32	10	10	.500	32	216	1	0	0	187.2	136	41	45	11	42	6	0	0	733	2	10.36	2.01	5.14	0.53	29.5	5.7	0.95	.273	2.16	46	2.36	57	6.52	37.1
13	Dallas Keuchel D. Keuchel	1.99	2020	CWS	11	6	2	.750	11	42	0	0	0	63.1	52	14	15	2	17	0	0	0	257	0	5.97	2.42	2.47	0.28	16.3	6.6	1.09	.255	2.13	45	3.07	66	7.39	10.6
14	Yu Darvish Y. Darvish	2.01	2020	CHC	12	8	3	.727	12	93	0	0	0	76.0	59	17	18	5	14	2	0	1	297	3	11.01	1.66	6.64	0.59	31.3	4.7	0.96	.295	2.13	46	2.22	50	6.99	18.6
15	Dinelson Lamet D. Lamet	2.09	2020	SDP	12	3	1	.750	12	93	0	0	0	69.0	39	16	18	5	20	4	0	0	267	1	12.13	2.61	4.65	0.65	34.8	7.5	0.86	.234	2.35	49	2.47	56	5.09	15.1
16	Clayton Kershaw C. Kershaw	2.13	2015	LAD	33	16	7	.696	33	301	4	3	0	232.2	163	55	62	15	42	5	0	1	890	9	11.64	1.62	7.17	0.58	33.8	4.7	0.88	.281	2.40	57	1.98	52	6.31	47.7
17	Kyle Hendricks K. Hendricks	2.13	2016	CHC	31	16	8	.667	30	170	2	1	0	190.0	142	45	53	15	44	8	0	3	745	5	8.05	2.08	3.86	0.71	22.8	5.9	0.98	.250	2.51	51	3.20	78	6.73	19.6
18	Felix Hernandez F. Hernandez	2.14	2014	SEA	34	15	6	.714	34	248	0	0	0	236.0	170	56	68	16	46	5	0	1	912	18	9.46	1.75	5.39	0.61	27.2	5.0	0.92	.258	2.59	58	2.56	69	6.48	30.7
19	Zack Greinke Z. Greinke	2.16	2009	KCR	33	16	8	.667	33	242	6	3	0	229.1	195	55	64	11	51	4	0	0	915	5	9.50	2.00	4.75	0.43	26.4	5.6	1.07	.303	2.51	48	2.32	53	7.65	52.5
20	Julio Urías J. Urías	2.16	2022	LAD	31	17	7	.708	31	166	0	0	0	175.0	127	42	51	23	41	5	0	0	689	0	8.54	2.11	4.05	1.18	24.1	6.0	0.96	.229	2.62	55	3.71	92	6.53	6.2
21	Chris Sale C. Sale	2.17	2014	CWS	26	12	4	.750	26	208	2	0	0	174.0	129	42	48	13	39	11	0	2	685	3	10.76	2.02	5.33	0.67	30.4	5.7	0.97	.280	2.48	56	2.57	66	6.67	25.1
22	Jose Fernandez J. Fernandez	2.19	2013	MIA	28	12	6	.667	28	187	0	0	0	172.2	111	42	47	10	58	5	0	5	681	3	9.75	3.02	3.22	0.52	27.5	8.5	0.98	.240	2.45	60	2.72	75	5.79	18.1
23	Dylan Cease D. Cease	2.20	2022	CWS	32	14	8	.636	32	227	1	1	0	184.0	126	45	55	16	78	3	0	2	747	7	11.10	3.82	2.91	0.78	30.4	10.4	1.11	.260	2.69	56	3.09	75	6.16	20.1
24	Trevor Bauer T. Bauer	2.21	2018	CLE	28	12	6	.667	27	221	0	0	1	175.1	134	43	51	9	57	9	1	2	717	12	11.34	2.93	3.88	0.46	30.8	7.9	1.09	.297	2.62	50	2.43	57	6.88	35
25	Tarik Skubal T. Skubal	2.21	2025	DET	31	13	6	.684	31	241	1	1	0	195.1	141	48	55	18	33	5	0	0	748	3	11.10	1.52	7.30	0.83	32.2	4.4	0.89	.273	2.53	55	2.45	59	6.50	37