Between the 1970 and 1979 seasons, Bruce Sutter had the lowest ERA, with an ERA of 2.33.

Interpreted as:

best earned run average with a minimum of 0.5 IP per team game by a player 1970s

	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	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
2	Mudcat Grant M. Grant	2.42	137	14	6	.700	0	93	0	0	34	237.2	216	64	70	21	66	4	90	16	963	2	3.52	2.50	1.41	0.80	9.7	6.9	1.19	.250	2.65	70	3.80	108	8.18	-7
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	Jim Palmer J. Palmer	2.58	355	186	103	.644	352	1,559	175	44	2	2745.0	2,275	787	883	184	861	26	3	31	11,105	55	5.11	2.82	1.81	0.60	14.0	7.8	1.14	.247	2.90	73	3.28	90	7.46	110.6
6	Sparky Lyle S. Lyle	2.61	600	69	59	.539	0	590	0	0	190	960.1	847	278	329	51	319	10	477	55	3,947	41	5.53	2.99	1.85	0.48	14.9	8.1	1.21	.267	3.08	71	3.08	83	7.94	67.9
7	Tom Seaver T. Seaver	2.61	348	178	101	.638	345	2,304	147	40	0	2652.1	2,105	768	843	190	741	28	2	65	10,607	64	7.82	2.51	3.11	0.64	21.7	7.0	1.07	.261	2.86	73	2.64	74	7.14	272
8	Clay Carroll C. Carroll	2.63	447	61	39	.610	11	385	0	0	106	766.1	731	224	257	36	252	16	248	65	3,191	17	4.52	2.96	1.53	0.42	12.1	7.9	1.28	.278	3.02	73	3.22	91	8.59	25.4
9	Kent Tekulve K. Tekulve	2.65	363	35	22	.614	0	313	0	0	83	540.1	459	159	187	21	190	7	214	59	2,230	14	5.21	3.16	1.65	0.35	14.0	8.5	1.20	.258	3.11	71	3.09	83	7.65	36.9
10	Gary Lavelle G. Lavelle	2.66	350	43	38	.531	0	370	0	0	74	522.0	484	154	181	22	233	9	216	68	2,239	9	6.38	4.02	1.59	0.38	16.5	10.4	1.37	.288	3.12	73	3.17	90	8.34	21.9
11	Jim Kern J. Kern	2.72	256	42	35	.545	12	499	1	0	75	539.0	428	163	188	20	276	21	178	32	2,261	23	8.33	4.61	1.81	0.33	22.1	12.2	1.31	.282	3.14	71	2.93	75	7.15	58
12	John Hiller J. Hiller	2.74	426	69	63	.523	17	812	6	2	115	911.0	749	277	314	81	414	11	321	64	3,828	33	8.02	4.09	1.96	0.80	21.2	10.8	1.28	.266	3.10	70	3.38	86	7.40	53.1
13	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
14	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
15	Bert Blyleven B. Blyleven	2.88	353	148	128	.536	350	2,082	145	39	0	2624.2	2,335	841	949	186	711	70	2	43	10,722	61	7.14	2.44	2.93	0.64	19.4	6.6	1.16	.280	3.25	78	2.80	76	8.01	260.7
16	Rollie Fingers R. Fingers	2.89	640	84	85	.497	29	973	3	1	209	1219.0	1,038	391	438	84	353	32	480	74	4,953	25	7.18	2.61	2.76	0.62	19.6	7.1	1.14	.272	3.23	84	2.83	79	7.66	100.9
17	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
18	Gaylord Perry G. Perry	2.92	369	184	133	.580	368	1,907	197	36	1	2905.0	2,559	942	1,088	207	758	51	1	75	11,759	68	5.91	2.35	2.52	0.64	16.2	6.4	1.14	.266	3.37	80	3.02	83	7.93	199.6
19	Frank Tanana F. Tanana	2.93	193	91	66	.580	187	1,120	85	24	0	1411.1	1,238	459	507	128	377	47	3	24	5,775	38	7.14	2.40	2.97	0.82	19.4	6.5	1.14	.271	3.23	82	3.11	85	7.89	88.7
20	Andy Messersmith A. Messersmith	2.93	276	110	86	.561	257	1,340	86	24	9	1899.0	1,506	619	710	154	696	34	16	33	7,791	51	6.35	3.30	1.93	0.73	17.2	8.9	1.16	.243	3.36	84	3.36	94	7.14	43.9
21	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
22	Dave Lemonds D. Lemonds	2.95	31	4	7	.364	18	69	0	0	0	94.2	87	31	39	6	38	1	2	3	400	3	6.56	3.61	1.82	0.57	17.3	9.5	1.32	.283	3.71	93	2.99	91	8.27	3.1
23	Jon Matlack J. Matlack	2.97	251	102	98	.510	245	1,215	85	28	1	1803.0	1,662	595	693	115	485	20	4	62	7,405	51	6.06	2.42	2.51	0.57	16.4	6.5	1.19	.278	3.46	84	2.89	81	8.30	133.8
24	Mike Marshall M. Marshall	2.98	629	89	94	.486	10	771	0	0	177	1176.2	1,063	390	446	61	439	25	505	47	4,926	58	5.90	3.36	1.76	0.47	15.7	8.9	1.28	.276	3.41	81	3.12	84	8.13	78.6
25	Don Wilson D. Wilson	3.01	167	64	55	.538	153	707	49	13	2	1124.2	936	376	425	83	403	27	7	17	4,663	42	5.66	3.22	1.75	0.66	15.2	8.6	1.19	.248	3.40	85	3.36	97	7.49	10.2