The San Francisco Giants had the best ERA by a team in 2010, with an ERA of 3.36.

	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	Giants	3.36	2010	162	.568	92	70	162	1,331	6	3	57	1461.0	1,279	546	583	134	578	51	58	6,159	74	8.20	3.56	2.30	0.83	21.6	9.4	1.27	.282	3.59	7.88
2	Padres	3.39	2010	162	.556	90	72	162	1,295	2	2	49	1456.1	1,305	549	581	139	517	28	51	6,058	29	8.00	3.20	2.50	0.86	21.4	8.5	1.25	.286	3.59	8.06
3	Braves	3.56	2010	162	.562	91	71	162	1,241	2	0	41	1439.1	1,326	569	629	126	505	49	64	6,052	42	7.76	3.16	2.46	0.79	20.5	8.3	1.27	.290	3.93	8.29
4	Athletics	3.56	2010	162	.500	81	81	162	1,070	7	3	38	1431.2	1,315	566	626	153	512	38	29	6,011	42	6.73	3.22	2.09	0.96	17.8	8.5	1.28	.274	3.94	8.27
5	Cardinals	3.57	2010	162	.531	86	76	162	1,094	7	3	32	1453.2	1,412	577	641	133	477	48	32	6,137	42	6.77	2.95	2.29	0.82	17.8	7.8	1.30	.292	3.97	8.74
6	Phillies	3.67	2010	162	.599	97	65	162	1,183	14	6	40	1456.1	1,402	594	640	168	416	57	42	6,095	26	7.31	2.57	2.84	1.04	19.4	6.8	1.25	.289	3.96	8.66
7	Mets	3.70	2010	162	.488	79	83	162	1,106	8	4	36	1453.0	1,438	597	652	135	545	52	55	6,245	48	6.85	3.38	2.03	0.84	17.7	8.7	1.36	.296	4.04	8.91
8	Rays	3.78	2010	162	.593	96	66	162	1,189	6	3	51	1453.2	1,347	611	649	175	478	46	34	6,103	60	7.36	2.96	2.49	1.08	19.5	7.8	1.26	.278	4.02	8.34
9	Mariners	3.93	2010	162	.377	61	101	162	973	11	2	38	1438.0	1,402	628	698	157	452	40	33	6,091	73	6.09	2.83	2.15	0.98	16.0	7.4	1.29	.279	4.37	8.77
10	Rangers	3.93	2010	162	.556	90	72	162	1,181	7	0	46	1455.1	1,355	636	687	162	551	63	24	6,213	56	7.30	3.41	2.14	1.00	19.0	8.9	1.31	.280	4.25	8.38
11	Twins	3.95	2010	162	.580	94	68	162	1,048	9	3	40	1452.2	1,493	638	671	155	383	47	19	6,106	41	6.49	2.37	2.74	0.96	17.2	6.3	1.29	.299	4.16	9.25
12	Reds	4.01	2010	162	.562	91	71	162	1,130	4	2	43	1453.0	1,404	648	685	158	524	50	32	6,182	48	7.00	3.25	2.16	0.98	18.3	8.5	1.33	.288	4.24	8.70
13	Dodgers	4.01	2010	162	.494	80	82	162	1,274	4	4	41	1441.2	1,323	643	692	134	539	58	75	6,141	58	7.95	3.36	2.36	0.84	20.7	8.8	1.29	.287	4.32	8.26
14	Angels	4.04	2010	162	.494	80	82	162	1,130	10	3	39	1449.1	1,422	651	702	148	565	46	33	6,252	80	7.02	3.51	2.00	0.92	18.1	9.0	1.37	.292	4.36	8.83
15	Yankees	4.06	2010	162	.586	95	67	162	1,154	3	0	39	1442.1	1,349	651	693	179	540	62	37	6,102	69	7.20	3.37	2.14	1.12	18.9	8.8	1.31	.281	4.32	8.42
16	Marlins	4.08	2010	162	.494	80	82	162	1,168	5	2	39	1438.1	1,433	652	717	134	549	51	42	6,217	49	7.31	3.44	2.13	0.84	18.8	8.8	1.38	.301	4.49	8.97
17	Astros	4.09	2010	162	.469	76	86	162	1,210	4	2	45	1439.1	1,446	654	729	140	548	40	39	6,221	57	7.57	3.43	2.21	0.88	19.5	8.8	1.39	.305	4.56	9.04
18	White Sox	4.09	2010	162	.543	88	74	162	1,149	6	2	43	1446.1	1,471	658	704	136	490	34	41	6,180	59	7.15	3.05	2.34	0.85	18.6	7.9	1.36	.305	4.38	9.15
19	Nationals	4.13	2010	162	.426	69	93	162	1,068	2	1	37	1435.0	1,469	658	742	151	512	46	57	6,214	33	6.70	3.21	2.09	0.95	17.2	8.2	1.38	.297	4.65	9.21
20	Rockies	4.14	2010	162	.512	83	79	162	1,234	6	2	35	1442.0	1,405	663	717	139	525	56	54	6,143	77	7.70	3.28	2.35	0.87	20.1	8.5	1.34	.302	4.48	8.77
21	Cubs	4.18	2010	162	.463	75	87	162	1,268	1	0	40	1436.2	1,409	668	767	154	605	65	42	6,298	46	7.94	3.79	2.10	0.96	20.1	9.6	1.40	.298	4.80	8.83
22	Red Sox	4.20	2010	162	.549	89	73	162	1,207	3	1	44	1456.2	1,402	679	744	152	580	53	30	6,267	58	7.46	3.58	2.08	0.94	19.3	9.3	1.36	.292	4.60	8.66
23	Blue Jays	4.22	2010	162	.525	85	77	162	1,184	5	2	45	1440.2	1,407	676	728	150	539	60	35	6,165	69	7.40	3.37	2.20	0.94	19.2	8.7	1.35	.297	4.55	8.79
24	Indians	4.30	2010	162	.426	69	93	162	967	10	2	34	1433.0	1,477	684	752	147	572	66	36	6,224	54	6.07	3.59	1.69	0.92	15.5	9.2	1.43	.297	4.72	9.28
25	Tigers	4.30	2010	162	.500	81	81	162	1,056	6	1	32	1444.1	1,445	690	743	142	537	65	29	6,198	75	6.58	3.35	1.97	0.88	17.0	8.7	1.37	.296	4.63	9.00