lowest era by a starting pitcher since 1960 to 1990 with at least 20 games started in a single season

Between the 1960 and 1990 seasons, Bob Gibson had the best ERA by a starting pitcher with 20+ starts in a season, with an ERA of 1.12 in 1968.

	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	Bob Gibson B. Gibson	1.12	34	1968	STL	34	22	9	.710	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	5.85
2	Dwight Gooden D. Gooden	1.53	35	1985	NYM	35	24	4	.857	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	6.44
3	Luis Tiant L. Tiant	1.57	32	1968	CLE	32	21	8	.724	256	19	9	0	253.0	143	44	51	15	70	4	0	3	960	3	9.11	2.49	3.66	0.53	26.7	7.3	0.84	.208	1.81	5.09
4	Dean Chance D. Chance	1.57	35	1964	LAA	35	18	8	.692	190	15	11	0	257.1	180	45	48	7	78	2	0	8	1,009	8	6.65	2.73	2.44	0.24	18.8	7.7	1.00	.236	1.68	6.30
5	Nolan Ryan N. Ryan	1.69	21	1981	HOU	21	11	5	.688	140	5	3	0	149.0	99	28	34	2	68	1	0	1	605	16	8.46	4.11	2.06	0.12	23.1	11.2	1.12	.246	2.05	5.98
6	Tom Seaver T. Seaver	1.70	35	1971	NYM	35	20	9	.690	288	21	4	0	285.2	207	54	59	17	61	4	0	2	1,098	4	9.07	1.92	4.72	0.54	26.2	5.6	0.94	.261	1.86	6.52
7	Sandy Koufax S. Koufax	1.73	41	1966	LAD	41	27	9	.750	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	6.72
8	Ron Guidry R. Guidry	1.74	35	1978	NYY	35	25	3	.893	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	6.15
9	Sandy Koufax S. Koufax	1.76	28	1964	LAD	28	19	5	.792	221	15	7	0	220.0	153	43	49	13	53	0	0	5	860	9	9.04	2.17	4.17	0.53	25.7	6.2	0.94	.244	2.00	6.26
10	Vida Blue V. Blue	1.82	39	1971	OAK	39	24	8	.750	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	6.03
11	Sam McDowell S. McDowell	1.82	37	1968	CLE	37	15	14	.517	281	11	3	0	267.0	180	54	78	13	109	10	0	9	1,091	7	9.47	3.67	2.58	0.44	25.8	10.0	1.08	.246	2.63	6.07
12	Joe Horlen J. Horlen	1.83	28	1964	CWS	28	12	9	.571	134	9	2	0	201.2	130	41	50	10	52	4	0	4	776	3	5.98	2.32	2.58	0.45	17.3	6.7	0.90	.208	2.23	5.80
13	Sandy Koufax S. Koufax	1.88	40	1963	LAD	40	25	5	.833	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	6.19
14	Gaylord Perry G. Perry	1.92	40	1972	CLE	40	24	16	.600	233	29	5	0	341.2	253	73	79	17	82	12	0	16	1,342	11	6.14	2.16	2.84	0.45	17.4	6.1	0.98	.236	2.08	6.66
15	Wilbur Wood W. Wood	1.92	42	1971	CWS	42	22	13	.629	209	22	7	0	332.0	270	71	95	21	61	7	0	2	1,308	6	5.67	1.65	3.43	0.57	16.0	4.7	1.00	.247	2.58	7.32
16	John Tudor J. Tudor	1.93	36	1985	STL	36	21	8	.724	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	6.84
17	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
18	Dave McNally D. McNally	1.95	35	1968	BAL	35	22	10	.688	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	5.77
19	Denny McLain D. McLain	1.96	41	1968	DET	41	31	6	.838	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	6.46
20	Phil Niekro P. Niekro	1.96	20	1967	ATL	20	10	7	.588	98	10	1	0	160.1	127	35	50	7	38	6	0	2	635	15	5.50	2.13	2.58	0.39	15.4	6.0	1.03	.247	2.81	7.13
21	Steve Carlton S. Carlton	1.97	41	1972	PHI	41	27	10	.730	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	6.68
22	Tommy John T. John	1.98	25	1968	CWS	25	10	5	.667	117	5	1	0	177.1	135	39	45	10	49	12	0	4	705	2	5.94	2.49	2.39	0.51	16.6	7.0	1.04	.242	2.28	6.85
23	Gary Nolan G. Nolan	1.99	25	1972	CIN	25	15	5	.750	90	6	2	0	176.0	147	39	48	13	30	1	0	5	689	5	4.60	1.53	3.00	0.66	13.1	4.4	1.01	.241	2.45	7.52
24	Gary Peters G. Peters	2.00	27	1966	CWS	27	12	9	.571	126	11	4	0	202.1	154	45	53	11	44	3	0	5	791	11	5.60	1.96	2.86	0.49	15.9	5.6	0.98	.236	2.36	6.85
25	Bob Veale B. Veale	2.02	33	1968	PIT	33	13	13	.500	169	13	4	0	244.2	184	55	66	12	94	2	0	5	992	9	6.22	3.46	1.80	0.44	17.0	9.5	1.14	.241	2.43	6.77