lowest era+ by a player in a season with at least 20 wins since 1950

Since 1950, Bob Gibson has the best ERA with 20+ pitcher wins in a season, with an ERA of 1.12 in 1968.

	NAME	ERA	W	SEASON	TM	L	W%	G	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	Bob Gibson B. Gibson	1.12	22	1968	STL	9	.710	34	34	268	28	13	0	304.2	198	38	49	11	62	7	0	6	1,161	4	7.92	1.83	4.32	0.32	23.1	5.3	0.85	.230	1.45	38	1.77	63	5.85	34.8
2	Dwight Gooden D. Gooden	1.53	24	1985	NYM	4	.857	35	35	268	16	8	0	276.2	198	47	51	13	69	2	0	4	1,065	6	8.72	2.24	3.88	0.42	25.2	6.5	0.97	.259	1.66	44	2.12	59	6.44	45.6
3	Luis Tiant L. Tiant	1.60	21	1968	CLE	9	.700	34	32	264	19	9	0	258.1	152	46	53	16	73	4	0	4	987	3	9.20	2.54	3.62	0.56	26.7	7.4	0.87	.216	1.85	53	2.04	64	5.30	33
4	Dean Chance D. Chance	1.65	20	1964	LAA	9	.690	46	35	207	15	11	4	278.1	194	51	56	7	86	2	7	9	1,093	9	6.69	2.78	2.41	0.23	18.9	7.9	1.01	.236	1.81	48	2.39	67	6.27	37.9
5	Sandy Koufax S. Koufax	1.73	27	1966	LAD	9	.750	41	41	317	27	5	0	323.0	241	62	74	19	77	0	0	4	1,274	7	8.83	2.15	4.12	0.53	24.9	6.0	0.98	.258	2.06	53	2.07	65	6.72	41.8
6	Ron Guidry R. Guidry	1.74	25	1978	NYY	3	.893	35	35	248	16	9	0	273.2	187	53	61	13	72	1	0	1	1,057	7	8.16	2.37	3.44	0.43	23.5	6.8	0.95	.241	2.01	48	2.18	58	6.15	48.5
7	Tom Seaver T. Seaver	1.76	20	1971	NYM	10	.667	36	35	289	21	4	0	286.1	210	56	61	18	61	4	1	2	1,103	5	9.08	1.92	4.74	0.57	26.2	5.5	0.95	.263	1.92	52	1.93	58	6.60	44.5
8	Jake Arrieta J. Arrieta	1.77	22	2015	CHC	6	.786	33	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
9	Clayton Kershaw C. Kershaw	1.77	21	2014	LAD	3	.875	27	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
10	Vida Blue V. Blue	1.82	24	1971	OAK	8	.750	39	39	301	24	8	0	312.0	209	63	73	19	88	4	0	3	1,207	10	8.68	2.54	3.42	0.55	24.9	7.3	0.95	.239	2.11	56	2.19	66	6.03	41.4
11	Sandy Koufax S. Koufax	1.88	25	1963	LAD	5	.833	40	40	306	20	11	0	311.0	214	65	68	18	58	3	0	7	1,210	6	8.86	1.68	5.28	0.52	25.3	4.8	0.87	.238	1.97	62	1.85	62	6.19	41.9
12	Blake Snell B. Snell	1.89	21	2018	TBR	5	.808	31	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
13	Wilbur Wood W. Wood	1.91	22	1971	CWS	13	.629	44	42	210	22	7	1	334.0	272	71	95	21	62	7	2	2	1,316	6	5.66	1.67	3.39	0.57	16.0	4.7	1.00	.247	2.56	53	2.63	71	7.33	38.9
14	Gaylord Perry G. Perry	1.92	24	1972	CLE	16	.600	41	40	234	29	5	1	342.2	253	73	79	17	82	12	1	16	1,345	11	6.15	2.15	2.85	0.45	17.4	6.1	0.98	.236	2.07	60	2.49	74	6.64	31.9
15	John Tudor J. Tudor	1.93	21	1985	STL	8	.724	36	36	169	14	10	0	275.0	209	59	68	14	49	5	0	4	1,062	4	5.53	1.60	3.45	0.46	15.9	4.6	0.94	.236	2.23	55	2.70	76	6.84	26.3
16	Roger Clemens R. Clemens	1.93	21	1990	BOS	6	.778	31	31	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	47	2.17	55	7.61	44.8
17	Dave McNally D. McNally	1.95	22	1968	BAL	10	.688	35	35	202	18	5	0	273.0	175	59	67	24	55	10	0	1	1,038	5	6.66	1.81	3.67	0.79	19.5	5.3	0.84	.202	2.21	67	2.76	90	5.77	9.5
18	Denny McLain D. McLain	1.96	31	1968	DET	6	.838	41	41	280	28	6	0	336.0	241	73	86	31	63	6	0	2	1,288	3	7.50	1.69	4.44	0.83	21.7	4.9	0.90	.231	2.30	64	2.53	79	6.46	24.8
19	Steve Carlton S. Carlton	1.97	27	1972	PHI	10	.730	41	41	310	30	8	0	346.1	257	76	84	17	87	1	0	8	1,351	8	8.06	2.26	3.56	0.44	22.9	6.4	0.99	.256	2.18	56	2.00	59	6.68	53.5
20	Sandy Koufax S. Koufax	2.04	26	1965	LAD	8	.765	43	41	382	27	8	2	335.2	216	76	90	26	71	5	2	4	1,297	11	10.24	1.90	5.38	0.70	29.5	5.5	0.86	.234	2.41	63	1.93	61	5.79	47.9
21	Catfish Hunter C. Hunter	2.04	21	1972	OAK	7	.750	38	37	191	16	5	0	295.1	200	67	74	21	70	3	1	6	1,148	3	5.82	2.13	2.73	0.64	16.6	6.1	0.91	.207	2.26	70	2.77	91	6.09	8.5
22	Roger Clemens R. Clemens	2.05	21	1997	TOR	7	.750	34	34	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	45	2.24	50	6.95	66.3
23	Allie Reynolds A. Reynolds	2.06	20	1952	NYY	8	.714	35	29	160	24	6	6	244.1	194	56	70	10	97	7	6		1,000	4	5.89	3.57	1.65	0.37	16.0	9.7	1.19	.253	2.58	60	2.89	83	7.15	16.2
24	Jim Palmer J. Palmer	2.07	21	1972	BAL	10	.677	36	36	184	18	3	0	274.1	219	63	73	21	70	1	0	1	1,094	4	6.04	2.30	2.63	0.69	16.8	6.4	1.05	.242	2.39	69	2.82	90	7.18	9.3
25	Pedro Martinez P. Martinez	2.07	23	1999	BOS	4	.852	31	29	313	5	1	0	213.1	160	49	56	9	37	9	1	1	835	6	13.20	1.56	8.46	0.38	37.5	4.4	0.92	.323	2.36	42	1.38	30	6.75	79.4