The Cleveland Indians had the lowest ERA by a team in 2017, with an ERA of 3.30.

	TEAM	ERA	SEASON	G	W%	W	L	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Indians	3.30	2017	162	.630	102	60	162	1,614	7	3	37	1440.2	1,267	529	564	163	406	45	15	5,866	48	10.08	2.54	3.98	1.02	27.5	6.9	1.16	.303	3.52	7.92
2	Dodgers	3.38	2017	162	.642	104	58	162	1,549	2	0	51	1444.2	1,226	543	580	184	442	40	33	5,925	40	9.65	2.75	3.50	1.15	26.1	7.5	1.15	.281	3.61	7.64
3	Diamondbacks	3.66	2017	162	.574	93	69	162	1,482	2	1	43	1441.0	1,309	586	659	171	516	38	45	6,072	82	9.26	3.22	2.87	1.07	24.4	8.5	1.27	.294	4.12	8.18
4	Red Sox	3.70	2017	162	.574	93	69	162	1,580	5	1	39	1482.1	1,384	610	668	195	465	49	18	6,217	43	9.59	2.82	3.40	1.18	25.4	7.5	1.25	.303	4.06	8.40
5	Yankees	3.72	2017	162	.562	91	71	162	1,560	2	1	36	1448.2	1,248	599	660	192	504	53	18	6,078	83	9.69	3.13	3.10	1.19	25.7	8.3	1.21	.280	4.10	7.75
6	Nationals	3.88	2017	162	.599	97	65	162	1,457	3	1	46	1446.2	1,300	623	672	189	495	60	39	6,068	44	9.06	3.08	2.94	1.18	24.0	8.2	1.24	.287	4.18	8.09
7	Cubs	3.95	2017	162	.568	92	70	162	1,439	2	1	38	1447.1	1,294	636	695	194	554	66	29	6,108	73	8.95	3.44	2.60	1.21	23.6	9.1	1.28	.285	4.32	8.05
8	Rays	3.97	2017	162	.494	80	82	162	1,352	0	0	53	1445.0	1,324	638	704	193	503	48	37	6,099	83	8.42	3.13	2.69	1.20	22.2	8.2	1.26	.283	4.38	8.25
9	Brewers	4.00	2017	162	.531	86	76	162	1,346	1	0	54	1445.2	1,381	642	697	185	553	64	45	6,164	50	8.38	3.44	2.43	1.15	21.8	9.0	1.34	.298	4.34	8.60
10	Cardinals	4.01	2017	162	.512	83	79	162	1,351	3	3	43	1450.1	1,393	646	705	183	493	67	50	6,153	38	8.38	3.06	2.74	1.14	22.0	8.0	1.30	.298	4.37	8.64
11	Astros	4.12	2017	162	.623	101	61	162	1,593	1	0	45	1446.0	1,314	662	700	192	522	70	17	6,111	86	9.91	3.25	3.05	1.20	26.1	8.5	1.27	.300	4.36	8.18
12	Angels	4.20	2017	162	.494	80	82	162	1,312	1	1	43	1440.2	1,373	672	709	224	470	44	25	6,030	57	8.20	2.94	2.79	1.40	21.8	7.8	1.28	.289	4.43	8.58
13	Pirates	4.22	2017	162	.463	75	87	162	1,262	2	1	36	1440.2	1,464	676	731	182	511	58	32	6,208	58	7.88	3.19	2.47	1.14	20.3	8.2	1.37	.306	4.57	9.15
14	Blue Jays	4.42	2017	162	.469	76	86	162	1,372	2	0	45	1465.0	1,460	720	784	203	549	48	25	6,316	53	8.43	3.37	2.50	1.25	21.7	8.7	1.37	.303	4.82	8.97
15	Mariners	4.46	2017	162	.481	78	84	162	1,244	1	0	39	1440.1	1,399	713	772	237	490	53	28	6,132	73	7.77	3.06	2.54	1.48	20.3	8.0	1.31	.283	4.82	8.74
16	Giants	4.50	2017	162	.395	64	98	162	1,234	3	2	32	1452.0	1,515	726	776	182	496	50	42	6,287	55	7.65	3.07	2.49	1.13	19.6	7.9	1.38	.308	4.81	9.39
17	Rockies	4.51	2017	162	.537	87	75	162	1,270	1	1	47	1437.2	1,453	721	757	190	532	50	20	6,177	69	7.95	3.33	2.39	1.19	20.6	8.6	1.38	.305	4.74	9.10
18	Phillies	4.55	2017	162	.407	66	96	162	1,309	1	0	33	1441.0	1,471	729	782	221	527	63	39	6,235	50	8.18	3.29	2.48	1.38	21.0	8.5	1.39	.304	4.88	9.19
19	Twins	4.59	2017	162	.525	85	77	162	1,166	6	3	42	1436.0	1,487	732	788	224	483	69	37	6,205	52	7.31	3.03	2.41	1.40	18.8	7.8	1.37	.296	4.94	9.32
20	Royals	4.61	2017	162	.494	80	82	162	1,216	1	1	39	1437.2	1,480	737	791	196	519	52	24	6,218	48	7.61	3.25	2.34	1.23	19.6	8.3	1.39	.303	4.95	9.27
21	Rangers	4.66	2017	162	.481	78	84	162	1,107	2	1	29	1434.1	1,443	742	816	214	559	74	22	6,211	63	6.95	3.51	1.98	1.34	17.8	9.0	1.40	.289	5.12	9.05
22	Padres	4.67	2017	162	.438	71	91	162	1,325	2	1	45	1430.2	1,417	742	816	226	554	75	28	6,169	73	8.34	3.49	2.39	1.42	21.5	9.0	1.38	.299	5.13	8.91
23	Athletics	4.67	2017	162	.463	75	87	162	1,202	1	1	35	1431.0	1,444	743	826	210	502	61	17	6,167	84	7.56	3.16	2.39	1.32	19.5	8.1	1.36	.294	5.19	9.08
24	Braves	4.72	2017	162	.444	72	90	162	1,258	0	0	36	1441.1	1,463	756	821	192	584	70	39	6,306	58	7.86	3.65	2.15	1.20	19.9	9.3	1.42	.302	5.13	9.14
25	White Sox	4.78	2017	162	.414	67	95	162	1,193	0	0	25	1421.2	1,384	755	820	242	632	68	36	6,200	67	7.55	4.00	1.89	1.53	19.2	10.2	1.42	.281	5.19	8.76