Between the 1975 and 1979 seasons, Tom Hilgendorf had the best ERA, with an ERA of 2.14.

Interpreted as:

best era with a minimum of 0.5 IP per team game by a player 1975 to 1979

	NAME	ERA	G	W	L	W%	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	Tom Hilgendorf T. Hilgendorf	2.14	53	7	3	.700	0	52	0	0	0	96.2	81	23	32	6	38	1	14	3	403	5	4.84	3.54	1.37	0.56	12.9	9.4	1.23	.245	2.98	57	3.52	96	7.54	1.7
2	Bruce Sutter B. Sutter	2.33	240	27	22	.551	0	418	0	0	105	390.2	281	101	121	22	115	2	179	27	1,560	26	9.63	2.65	3.63	0.51	26.8	7.4	1.01	.258	2.79	58	2.16	56	6.47	72.9
3	Ron Guidry R. Guidry	2.49	116	59	19	.756	91	652	40	16	3	752.1	599	208	234	46	221	2	14	3	2,994	23	7.80	2.64	2.95	0.55	21.8	7.4	1.09	.267	2.80	64	2.61	66	7.17	112
4	John Fulgham J. Fulgham	2.53	20	10	6	.625	19	75	10	2	0	146.0	123	41	47	10	26	3	0	3	576	2	4.62	1.60	2.88	0.62	13.0	4.5	1.02	.245	2.90	68	3.18	87	7.58	7.7
5	Rich Gossage R. Gossage	2.58	264	44	48	.478	29	579	15	0	98	691.1	526	198	222	42	287	18	193	36	2,839	19	7.54	3.74	2.02	0.55	20.4	10.1	1.18	.253	2.89	70	3.07	83	6.85	51.6
6	Bob Apodaca B. Apodaca	2.58	148	10	19	.345	3	143	0	0	23	258.1	220	74	90	15	87	4	93	32	1,069	4	4.98	3.03	1.64	0.52	13.4	8.1	1.19	.250	3.14	73	3.35	93	7.66	6.7
7	Jim Palmer J. Palmer	2.58	179	96	53	.644	177	750	96	25	1	1408.2	1,161	404	454	95	403	14	2	11	5,629	22	4.79	2.57	1.86	0.61	13.3	7.2	1.11	.244	2.90	72	3.34	90	7.42	61.2
8	Kent Tekulve K. Tekulve	2.59	355	34	21	.618	0	307	0	0	83	531.1	447	153	181	20	185	6	209	57	2,186	14	5.20	3.13	1.66	0.34	14.0	8.5	1.19	.256	3.07	70	3.06	83	7.57	37.9
9	Jim Kern J. Kern	2.66	252	42	34	.553	9	488	0	0	75	523.2	412	155	179	19	262	21	178	31	2,185	23	8.39	4.50	1.86	0.33	22.3	12.0	1.29	.282	3.08	70	2.88	74	7.08	59.7
10	Gary Lavelle G. Lavelle	2.67	340	43	35	.551	0	358	0	0	74	505.1	470	150	174	21	223	9	212	66	2,164	9	6.38	3.97	1.61	0.37	16.5	10.3	1.37	.289	3.10	73	3.15	89	8.37	22.2
11	Tom Seaver T. Seaver	2.69	172	89	46	.659	171	1,031	64	23	0	1287.1	1,032	385	424	86	381	8	0	38	5,168	36	7.21	2.66	2.71	0.60	19.9	7.4	1.10	.258	2.96	75	2.81	77	7.21	117.2
12	Mark Littell M. Littell	2.75	250	30	22	.577	11	414	1	0	52	421.2	300	129	146	18	228	5	159	31	1,753	26	8.84	4.87	1.82	0.38	23.6	13.0	1.25	.259	3.12	73	2.90	80	6.40	34.5
13	Sparky Lyle S. Lyle	2.78	311	39	31	.557	0	275	0	0	77	536.2	501	166	191	28	172	8	241	32	2,215	21	4.61	2.88	1.60	0.47	12.4	7.8	1.25	.273	3.20	74	3.31	87	8.40	30.7
14	Mark Fidrych M. Fidrych	2.79	49	27	16	.628	47	154	33	5	0	368.0	339	114	128	18	79	5	2	7	1,480	7	3.77	1.93	1.95	0.44	10.4	5.3	1.14	.262	3.13	72	3.13	83	8.29	27.2
15	Ken Forsch K. Forsch	2.81	206	34	31	.523	44	277	16	4	36	598.0	561	187	208	32	156	7	115	31	2,450	8	4.17	2.35	1.78	0.48	11.3	6.4	1.20	.267	3.13	83	3.23	93	8.44	15.2
16	Bob Welch B. Welch	2.85	48	12	10	.545	25	130	5	3	8	192.2	174	61	70	13	58	4	16	6	788	2	6.07	2.71	2.24	0.61	16.5	7.4	1.20	.276	3.27	79	3.13	85	8.13	11.5
17	Frank Tanana F. Tanana	2.88	150	75	45	.625	148	918	71	19	0	1116.1	956	357	392	99	292	39	1	20	4,540	32	7.40	2.35	3.14	0.80	20.2	6.4	1.12	.268	3.16	79	3.03	81	7.71	85.9
18	Dan Schatzeder D. Schatzeder	2.91	67	19	13	.594	42	189	6	1	1	327.1	260	106	117	27	140	3	5	7	1,356	11	5.20	3.85	1.35	0.74	13.9	10.3	1.22	.234	3.22	81	3.88	108	7.15	-10.9
19	Burt Hooton B. Hooton	2.92	160	71	51	.582	158	655	48	14	1	1132.2	964	368	414	76	312	6	1	21	4,587	19	5.20	2.48	2.10	0.60	14.3	6.8	1.13	.251	3.29	82	3.20	87	7.66	60.1
20	John Candelaria J. Candelaria	2.94	146	70	38	.648	141	561	32	7	2	967.1	857	316	354	99	236	14	4	28	3,941	7	5.22	2.20	2.38	0.92	14.2	6.0	1.13	.250	3.29	80	3.60	97	7.97	12.2
21	Rollie Fingers R. Fingers	3.00	344	46	48	.489	0	478	0	0	129	584.2	511	195	210	39	175	16	293	47	2,401	14	7.36	2.69	2.73	0.60	19.9	7.3	1.17	.279	3.23	86	2.85	78	7.87	52.2
22	Tommy John T. John	3.02	132	68	36	.654	128	449	41	8	1	916.2	930	308	362	39	229	12	4	15	3,802	30	4.41	2.25	1.96	0.38	11.8	6.0	1.26	.290	3.55	82	3.03	80	9.13	79.9
23	Elias Sosa E. Sosa	3.03	276	26	24	.520	1	265	0	0	39	428.0	388	144	167	23	161	9	154	39	1,791	12	5.57	3.39	1.65	0.48	14.8	9.0	1.28	.274	3.51	82	3.29	88	8.16	22
24	Steve Rogers S. Rogers	3.03	175	61	67	.477	173	762	61	17	2	1251.0	1,150	421	480	65	380	19	2	29	5,150	48	5.48	2.73	2.01	0.47	14.8	7.4	1.22	.277	3.45	82	3.06	84	8.27	80.3
25	Bert Blyleven B. Blyleven	3.04	172	68	53	.562	172	988	68	18	0	1289.0	1,138	435	487	96	392	35	0	22	5,293	37	6.90	2.74	2.52	0.67	18.7	7.4	1.19	.276	3.40	81	3.07	82	7.95	94.9