lowest era by a starting pitcher since 1990 to 2024 with at least 20 games started in a single season

Between the 1990 and 2024 seasons, Greg Maddux had the lowest ERA by a starting pitcher with 20+ starts in a season, with an ERA of 1.56 in 1994.

	NAME	ERA	GS	SEASON	TM	G	W	L	W%	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	H/9
1	Greg Maddux G. Maddux	1.56	25	1994	ATL	25	16	6	.727	156	10	3	0	202.0	150	35	44	4	31	6	0	3	774	3	6.95	1.38	5.03	0.18	20.2	4.0	0.90	.253	1.96	6.68
2	Greg Maddux G. Maddux	1.63	28	1995	ATL	28	19	2	.905	181	10	3	0	209.2	147	38	39	8	23	4	0	3	785	1	7.77	0.99	7.87	0.34	23.1	2.9	0.81	.244	1.67	6.31
3	Zack Greinke Z. Greinke	1.66	32	2015	LAD	32	19	3	.864	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	5.98
4	Clayton Kershaw C. Kershaw	1.69	21	2016	LAD	21	12	4	.750	172	3	3	0	149.0	97	28	31	8	11	2	0	1	544	5	10.39	0.66	15.64	0.48	31.6	2.0	0.72	.254	1.87	5.86
5	Jacob deGrom J. deGrom	1.70	32	2018	NYM	32	10	9	.526	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	6.30
6	Pedro Martinez P. Martinez	1.74	29	2000	BOS	29	18	6	.750	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	5.31
7	Justin Verlander J. Verlander	1.75	28	2022	HOU	28	18	4	.818	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	5.97
8	Jake Arrieta J. Arrieta	1.77	33	2015	CHC	33	22	6	.786	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	5.90
9	Clayton Kershaw C. Kershaw	1.77	27	2014	LAD	27	21	3	.875	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	6.31
10	Clayton Kershaw C. Kershaw	1.83	33	2013	LAD	33	16	9	.640	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	6.25
11	Roger Clemens R. Clemens	1.87	32	2005	HOU	32	13	8	.619	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	6.43
12	Kevin Brown K. Brown	1.89	32	1996	FLA	32	17	11	.607	159	5	3	0	233.0	187	49	60	8	33	16	0	2	906	6	6.14	1.27	4.82	0.31	17.5	3.6	0.94	.259	2.32	7.22
13	Blake Snell B. Snell	1.89	31	2018	TBR	31	21	5	.808	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	5.58
14	Pedro Martinez P. Martinez	1.90	31	1997	MON	31	17	8	.680	305	13	4	0	241.1	158	51	65	16	67	9	0	5	947	3	11.37	2.50	4.55	0.60	32.2	7.1	0.93	.258	2.42	5.89
15	Roger Clemens R. Clemens	1.93	31	1990	BOS	31	21	6	.778	209	7	4	0	228.1	193	49	59	7	54	7	0	3	920	8	8.24	2.13	3.87	0.28	22.7	5.9	1.08	.289	2.33	7.61
16	Paul Skenes P. Skenes	1.96	23	2024	PIT	23	11	3	.786	170	0	0	0	133.0	94	29	31	10	32	6	0	0	514	2	11.50	2.17	5.31	0.68	33.1	6.2	0.95	.284	2.10	6.36
17	Reynaldo López R. López	2.00	25	2024	ATL	25	8	5	.615	146	0	0	0	134.2	108	30	32	10	42	2	0	0	540	2	9.76	2.81	3.48	0.67	27.0	7.8	1.11	.288	2.14	7.22
18	Roger Clemens R. Clemens	2.05	34	1997	TOR	34	21	7	.750	292	9	3	0	264.0	204	60	65	9	68	12	0	1	1,044	4	9.95	2.32	4.29	0.31	28.0	6.5	1.03	.294	2.22	6.95
19	Rich Harden R. Harden	2.07	25	2008	TOT	25	10	2	.833	181	0	0	0	148.0	96	34	38	11	61	3	0	2	595	3	11.01	3.71	2.97	0.67	30.4	10.3	1.06	.251	2.31	5.84
20	Pedro Martinez P. Martinez	2.07	29	1999	BOS	29	22	4	.846	306	5	1	0	208.1	157	48	55	8	36	8	0	1	816	6	13.22	1.56	8.50	0.35	37.5	4.4	0.93	.325	2.38	6.78
21	Ryne Stanek R. Stanek	2.09	27	2019	TBR	27	0	1	.000	49	0	0	0	43.0	29	10	12	3	14	0	0	0	169	1	10.26	2.93	3.50	0.63	29.0	8.3	1.00	.252	2.51	6.07
22	Chris Sale C. Sale	2.11	27	2018	BOS	27	12	4	.750	237	0	0	0	158.0	102	37	39	11	34	14	0	0	617	4	13.50	1.94	6.97	0.63	38.4	5.5	0.86	.283	2.22	5.81
23	Rich Hill R. Hill	2.12	20	2016	TOT	20	12	5	.706	129	0	0	0	110.1	77	26	29	4	33	8	0	0	439	0	10.52	2.69	3.91	0.33	29.4	7.5	1.00	.275	2.37	6.28
24	Clayton Kershaw C. Kershaw	2.13	33	2015	LAD	33	16	7	.696	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	6.31
25	Felix Hernandez F. Hernandez	2.14	34	2014	SEA	34	15	6	.714	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	6.48