lowest era+ by a player in a season with at least 15 wins since 1950

Since 1950, Bob Gibson has the best ERA with 15+ 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	Greg Maddux G. Maddux	1.56	16	1994	ATL	6	.727	25	25	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	37	2.39	55	6.68	43.7
4	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
5	Greg Maddux G. Maddux	1.63	19	1995	ATL	2	.905	28	28	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	39	2.25	52	6.31	46.9
6	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
7	Zack Greinke Z. Greinke	1.66	19	2015	LAD	3	.864	32	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
8	Ron Perranoski R. Perranoski	1.67	16	1963	LAD	3	.842	69	0	75	0	0	21	129.0	112	24	30	7	43	4	47	14	541	4	5.23	3.00	1.74	0.49	13.9	7.9	1.20	.255	2.09	55	3.11	104	7.81	-2.3
9	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
10	Sandy Koufax S. Koufax	1.74	19	1964	LAD	5	.792	29	28	223	15	7	1	223.0	154	43	49	13	53	0	1	5	870	9	9.00	2.14	4.21	0.52	25.6	6.1	0.93	.243	1.98	53	2.08	67	6.22	27.1
11	Pedro Martinez P. Martinez	1.74	18	2000	BOS	6	.750	29	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
12	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
13	Justin Verlander J. Verlander	1.75	18	2022	HOU	4	.818	28	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
14	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
15	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
16	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
17	Sam McDowell S. McDowell	1.81	15	1968	CLE	14	.517	38	37	283	11	3	0	269.0	181	54	78	13	110	10	0	9	1,098	7	9.47	3.68	2.57	0.43	25.8	10.0	1.08	.246	2.61	59	2.25	70	6.06	28.3
18	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
19	Clayton Kershaw C. Kershaw	1.83	16	2013	LAD	9	.640	33	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
20	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
21	Kevin Brown K. Brown	1.89	17	1996	FLA	11	.607	32	32	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	46	2.88	68	7.22	35.8
22	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
23	Pedro Martinez P. Martinez	1.90	17	1997	MON	8	.680	31	31	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	45	2.38	57	5.89	49
24	Luis Tiant L. Tiant	1.91	15	1972	BOS	6	.714	43	19	123	12	6	3	179.0	128	38	45	7	65	0	12	5	713	0	6.18	3.27	1.89	0.35	17.3	9.1	1.08	.234	2.26	59	2.62	77	6.44	14.9
25	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