The New York Highlanders had their lowest ERA in a season in 1904, with an ERA of 2.57.

	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	Highlanders	2.57	1904	155	.609	92	59	155	684	123	14	1	1380.2	1,180	394	526	29	311	41		5,440	41	4.46	2.03	2.20	0.19	12.6	5.7	1.08	.263	3.43	7.69
2	Highlanders	2.61	1910	156	.583	88	63	156	654	110	14	8	1399.0	1,238	406	556	16	364	54		5,518	27	4.21	2.34	1.80	0.10	11.9	6.6	1.15	.276	3.58	7.96
3	Highlanders	2.65	1909	153	.490	74	77	153	597	94	17	8	1350.1	1,223	397	588	21	422	69		5,424	37	3.98	2.81	1.41	0.14	11.0	7.8	1.22	.279	3.92	8.15
4	Yankees	2.66	1917	155	.464	71	82	155	571	87	9	6	1411.1	1,280	417	558	28	427	36		5,551	20	3.64	2.72	1.34	0.18	10.3	7.7	1.21	.279	3.56	8.16
5	Yankees	2.77	1916	156	.519	80	74	156	616	84	11	17	1428.0	1,249	440	561	37	476	47		5,640	22	3.88	3.00	1.29	0.23	10.9	8.4	1.21	.272	3.54	7.87
6	Highlanders	2.78	1906	155	.596	90	61	155	605	99	18	5	1357.2	1,236	419	544	21	351	45		5,429	36	4.01	2.33	1.72	0.14	11.1	6.5	1.17	.276	3.61	8.19
7	Yankees	2.79	1968	164	.512	83	79	164	831	45	11	27	1467.1	1,308	455	531	99	424	30	62	6,032	27	5.10	2.60	1.96	0.61	13.8	7.0	1.18	.260	3.26	8.02
8	Yankees	2.81	1914	157	.455	70	84	157	563	98	9	2	1397.1	1,277	437	550	30	390	32		5,524	37	3.63	2.51	1.44	0.19	10.2	7.1	1.19	.277	3.54	8.22
9	Yankees	2.82	1919	141	.576	80	59	141	500	85	14	7	1287.0	1,143	403	506	47	433	37		5,225	19	3.50	3.03	1.15	0.33	9.6	8.3	1.22	.260	3.54	7.99
10	Yankees	2.90	1981	107	.551	59	48	107	606	16	0	30	948.0	827	305	343	64	287	10	17	3,872	25	5.75	2.72	2.11	0.61	15.7	7.4	1.18	.263	3.26	7.85
11	Yankees	2.91	1942	154	.669	103	51	154	558	88	18	17	1375.0	1,259	444	507	71	431	17		5,667	17	3.65	2.82	1.29	0.46	9.8	7.6	1.23	.259	3.32	8.24
12	Yankees	2.93	1943	155	.636	98	56	155	653	83	14	13	1415.1	1,229	460	542	60	489	13		5,848	20	4.15	3.11	1.34	0.38	11.2	8.4	1.21	.252	3.45	7.82
13	Highlanders	2.93	1905	152	.477	71	78	152	642	88	16	4	1353.2	1,235	440	622	26	396	43		5,487	46	4.27	2.63	1.62	0.17	11.7	7.2	1.20	.276	4.14	8.21
14	Yankees	3.00	1957	154	.636	98	56	154	810	41	11	42	1395.1	1,198	465	534	110	580	39	19	5,822	26	5.22	3.74	1.40	0.71	13.9	10.0	1.27	.254	3.44	7.73
15	Yankees	3.00	1918	126	.488	60	63	126	370	59	8	13	1157.1	1,103	386	474	25	463	39		4,821	14	2.88	3.60	0.80	0.19	7.7	9.6	1.35	.275	3.69	8.58
16	Highlanders	3.03	1907	152	.473	70	78	152	511	93	7	6	1333.2	1,327	449	671	13	428	48		5,547	28	3.45	2.89	1.19	0.09	9.2	7.7	1.32	.289	4.53	8.96
17	Yankees	3.05	1972	155	.510	79	76	155	625	35	14	39	1373.1	1,306	465	527	87	419	30	61	5,726	47	4.10	2.75	1.49	0.57	10.9	7.3	1.26	.267	3.45	8.56
18	Yankees	3.06	1915	154	.454	69	83	154	559	101	12	1	1382.2	1,272	470	588	41	517	48		5,579	20	3.64	3.37	1.08	0.27	10.0	9.3	1.29	.279	3.83	8.28
19	Yankees	3.07	1963	161	.646	104	57	161	965	59	17	31	1449.0	1,239	495	547	115	476	22	25	5,940	33	5.99	2.96	2.03	0.71	16.2	8.0	1.18	.258	3.40	7.70
20	Highlanders	3.08	1903	136	.537	72	62	136	463	111	7	2	1201.1	1,171	411	573	19	245	41		4,882	22	3.47	1.84	1.89	0.14	9.5	5.0	1.18	.280	4.29	8.77
21	Yankees	3.13	1946	154	.565	87	67	154	653	68	16	17	1361.0	1,232	474	547	66	552	13		5,730	12	4.32	3.65	1.18	0.44	11.4	9.6	1.31	.262	3.62	8.15
22	Yankees	3.14	1952	154	.617	95	59	154	666	72	17	27	1381.0	1,240	482	557	94	581	34		5,799	16	4.34	3.79	1.15	0.61	11.5	10.0	1.32	.259	3.63	8.08
23	Yankees	3.15	1964	164	.611	99	63	164	989	46	16	45	1506.2	1,312	528	577	129	504	22	39	6,231	43	5.91	3.01	1.96	0.77	15.9	8.1	1.21	.258	3.45	7.84
24	Highlanders	3.16	1908	155	.331	51	103	155	585	90	11	3	1366.0	1,293	479	712	26	458	72		5,653	35	3.85	3.02	1.28	0.17	10.3	8.1	1.28	.281	4.69	8.52
25	Yankees	3.18	1978	163	.613	100	63	163	817	39	12	36	1460.2	1,321	516	582	111	478	32	30	6,063	43	5.03	2.95	1.71	0.68	13.5	7.9	1.23	.262	3.59	8.14