lowest era- by a player with at least 400 ip between 1964 to 1966

Between the 1964 and 1966 seasons, Sandy Koufax had the best ERA- when pitching at least 400 innings, with an ERA- of 57.

	NAME	ERA-	IP	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	FIP	FIP-	H/9	PRAA
1	Sandy Koufax S. Koufax	57	881.2	113	72	22	.766	110	1.85	922	69	20	3	611	181	213	58	201	5	3	13	3,441	27	9.41	2.05	4.59	0.59	26.8	5.8	0.92	.245	2.17	2.02	64	6.24	116.7
2	Juan Marichal J. Marichal	64	871.2	109	68	27	.716	106	2.27	668	71	18	1	693	220	255	77	134	10	3	15	3,422	9	6.90	1.38	4.99	0.80	19.5	3.9	0.95	.243	2.63	2.67	78	7.16	74.2
3	Jim Maloney J. Maloney	71	696.0	96	51	27	.654	96	2.68	674	35	12	0	538	207	224	47	283	16	0	12	2,863	43	8.72	3.66	2.38	0.61	23.5	9.9	1.18	.266	2.90	2.79	77	6.96	63.7
4	Jim Bunning J. Bunning	72	889.1	123	57	31	.648	119	2.54	739	44	17	3	761	251	282	72	163	45	4	21	3,590	8	7.48	1.65	4.53	0.73	20.6	4.5	1.04	.268	2.85	2.65	78	7.70	74.3
5	Sam McDowell S. McDowell	73	640.2	108	37	25	.597	87	2.53	727	28	10	8	456	180	206	29	334	15	13	16	2,682	33	10.21	4.69	2.18	0.41	27.1	12.5	1.23	.271	2.89	2.51	69	6.41	78.9
6	Joe Horlen J. Horlen	73	640.2	103	36	35	.507	91	2.40	387	20	8	1	530	171	206	41	147	13	5	24	2,569	26	5.44	2.07	2.63	0.58	15.1	5.7	1.06	.247	2.89	2.93	86	7.45	35.3
7	Jim Perry J. Perry	76	417.1	111	29	17	.630	45	2.72	265	12	3	2	352	126	144	42	123	9	14	10	1,700	16	5.71	2.65	2.15	0.91	15.6	7.2	1.14	.246	3.11	3.53	95	7.59	8.8
8	Bob Gibson B. Gibson	76	866.2	113	60	36	.625	107	2.85	740	57	13	2	703	274	306	79	267	25	4	20	3,543	26	7.68	2.77	2.77	0.82	20.9	7.5	1.12	.257	3.18	3.05	84	7.30	53.8
9	Whitey Ford W. Ford	78	562.0	98	35	24	.593	81	2.66	377	21	10	2	532	166	197	40	131	3	10	11	2,314	14	6.04	2.10	2.88	0.64	16.3	5.7	1.18	.279	3.15	2.86	80	8.52	44.8
10	Dean Chance D. Chance	78	763.2	123	47	36	.566	105	2.58	551	36	17	5	597	219	255	37	301	18	11	28	3,110	23	6.49	3.55	1.83	0.44	17.7	9.7	1.18	.254	3.01	3.00	87	7.04	39.8
11	Gary Peters G. Peters	80	654.2	100	42	30	.583	93	2.64	429	23	7	0	554	192	219	50	212	14	4	23	2,682	34	5.90	2.91	2.02	0.69	16.0	7.9	1.17	.255	3.01	3.28	95	7.62	10.5
12	Sonny Siebert S. Siebert	80	585.2	114	39	25	.609	73	2.80	498	18	3	5	474	182	208	54	165	13	16	9	2,352	17	7.65	2.54	3.02	0.83	21.2	7.0	1.09	.259	3.20	2.97	82	7.28	41.9
13	Bob Veale B. Veale	80	814.0	117	51	36	.586	112	2.86	755	40	11	0	671	259	297	31	345	15	3	22	3,398	45	8.35	3.81	2.19	0.34	22.2	10.2	1.25	.284	3.28	2.53	74	7.42	81.9
14	Jim Kaat J. Kaat	81	812.0	122	60	35	.632	117	2.92	530	39	5	2	769	263	335	77	178	17	3	15	3,351	28	5.87	1.97	2.98	0.85	15.8	5.3	1.17	.271	3.71	3.21	86	8.52	47.8
15	Chris Short C. Short	82	790.0	131	55	30	.647	110	2.89	595	46	13	4	691	254	285	56	208	18	9	15	3,201	15	6.78	2.37	2.86	0.64	18.6	6.5	1.14	.273	3.25	2.83	83	7.87	50.7
16	Bobby Bolin B. Bolin	83	562.0	119	31	25	.554	70	2.96	424	17	7	4	442	185	207	58	203	24	20	17	2,317	14	6.79	3.25	2.09	0.93	18.3	8.8	1.15	.239	3.31	3.60	105	7.08	-10.3
17	Don Drysdale D. Drysdale	85	903.1	124	54	44	.551	122	2.76	624	52	15	1	791	277	318	66	179	39	1	28	3,661	29	6.22	1.78	3.49	0.66	17.0	4.9	1.07	.263	3.17	2.85	91	7.88	27.7
18	Steve Barber S. Barber	85	511.0	98	34	28	.548	80	2.94	339	16	5	1	425	167	189	37	211	12	4	11	2,113	22	5.97	3.72	1.61	0.65	16.0	10.0	1.24	.256	3.33	3.48	98	7.49	3.8
19	Claude Osteen C. Osteen	88	784.1	116	47	42	.528	114	2.98	432	30	4	0	747	260	294	45	207	8	1	31	3,244	12	4.96	2.38	2.09	0.52	13.3	6.4	1.22	.275	3.37	3.02	90	8.57	28.4
20	Mel Stottlemyre M. Stottlemyre	89	638.0	87	41	32	.562	84	3.00	350	32	9	1	566	213	241	39	205	10	2	13	2,620	14	4.94	2.89	1.71	0.55	13.4	7.8	1.21	.261	3.40	3.25	92	7.98	18.6
21	Luis Tiant L. Tiant	89	478.1	106	33	26	.559	62	3.10	402	26	10	10	381	165	179	49	163	7	29	9	1,952	9	7.56	3.07	2.47	0.92	20.6	8.4	1.14	.249	3.37	3.27	91	7.17	18.1
22	Vern Law V. Law	90	587.0	95	41	30	.577	85	3.20	282	28	13	0	588	209	236	54	91	8	4	9	2,379	2	4.32	1.40	3.10	0.83	11.9	3.8	1.16	.275	3.62	3.30	96	9.02	8.7
23	Milt Pappas M. Pappas	90	682.2	104	41	27	.603	102	3.26	417	28	12	0	641	247	276	66	139	13	0	17	2,772	17	5.50	1.83	3.00	0.87	15.0	5.0	1.14	.269	3.64	3.26	90	8.45	27.8
24	Juan Pizarro J. Pizarro	90	424.2	85	33	18	.647	60	3.01	269	14	5	3	380	142	169	41	131	5	12	15	1,757	16	5.70	2.78	2.05	0.87	15.3	7.5	1.20	.259	3.58	3.52	102	8.05	-3.5
25	George Brunet G. Brunet	91	451.1	92	24	26	.480	65	3.01	325	16	5	2	370	151	169	32	200	8	12	17	1,899	8	6.48	3.99	1.63	0.64	17.1	10.5	1.26	.253	3.37	3.41	100	7.38	-0.2