The Toronto Blue Jays had the lowest ERA by a team in 2008, with an ERA of 3.49.

	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	Blue Jays	3.49	2008	162	.531	86	76	162	1,184	15	5	44	1446.2	1,330	561	610	134	467	67	42	6,067	51	7.37	2.91	2.54	0.83	19.5	7.7	1.24	.284	3.79	8.27
2	Dodgers	3.68	2008	162	.519	84	78	162	1,205	5	4	35	1447.1	1,381	591	648	123	480	48	58	6,127	47	7.49	2.98	2.51	0.76	19.7	7.8	1.29	.295	4.03	8.59
3	Rays	3.82	2008	162	.599	97	65	162	1,143	7	5	52	1457.2	1,349	618	671	166	526	46	29	6,145	52	7.06	3.25	2.17	1.02	18.6	8.6	1.29	.277	4.14	8.33
4	Brewers	3.85	2008	162	.556	90	72	162	1,110	12	6	45	1455.2	1,415	623	689	175	528	42	32	6,209	53	6.86	3.26	2.10	1.08	17.9	8.5	1.33	.285	4.26	8.75
5	Cubs	3.87	2008	161	.602	97	64	161	1,264	2	1	44	1450.2	1,329	624	671	160	548	65	45	6,194	48	7.84	3.40	2.31	0.99	20.4	8.8	1.29	.281	4.16	8.25
6	Phillies	3.88	2008	162	.568	92	70	162	1,081	4	3	47	1449.2	1,444	625	680	160	533	57	64	6,229	34	6.71	3.31	2.03	0.99	17.4	8.6	1.36	.292	4.22	8.96
7	Diamondbacks	3.98	2008	162	.506	82	80	162	1,229	6	2	39	1434.2	1,403	635	706	147	451	68	41	6,119	59	7.71	2.83	2.73	0.92	20.1	7.4	1.29	.297	4.43	8.80
8	Angels	3.99	2008	162	.617	100	62	162	1,106	7	1	66	1451.1	1,455	644	697	160	457	63	32	6,161	50	6.86	2.83	2.42	0.99	18.0	7.4	1.32	.296	4.32	9.02
9	Red Sox	4.01	2008	162	.586	95	67	162	1,185	5	2	47	1446.1	1,369	645	694	147	548	68	17	6,180	43	7.37	3.41	2.16	0.91	19.2	8.9	1.33	.289	4.32	8.52
10	Athletics	4.01	2008	161	.466	75	86	161	1,061	4	1	33	1435.0	1,364	640	690	135	576	54	45	6,112	30	6.65	3.61	1.84	0.85	17.4	9.4	1.35	.287	4.33	8.55
11	White Sox	4.06	2008	163	.546	89	74	163	1,147	4	0	34	1457.2	1,471	658	729	156	460	48	42	6,218	54	7.08	2.84	2.49	0.96	18.4	7.4	1.32	.298	4.50	9.08
12	Mets	4.07	2008	162	.549	89	73	162	1,181	5	2	43	1464.1	1,415	662	715	163	590	70	53	6,338	55	7.26	3.63	2.00	1.00	18.6	9.3	1.37	.289	4.39	8.70
13	Twins	4.16	2008	163	.540	88	75	163	995	5	2	42	1459.0	1,568	675	745	183	406	31	38	6,221	45	6.14	2.50	2.45	1.13	16.0	6.5	1.35	.301	4.60	9.67
14	Cardinals	4.19	2008	162	.531	86	76	162	957	2	1	42	1454.0	1,517	677	725	163	496	51	21	6,264	50	5.92	3.07	1.93	1.01	15.3	7.9	1.38	.295	4.49	9.39
15	Yankees	4.28	2008	162	.549	89	73	162	1,141	1	0	42	1441.2	1,478	685	727	143	489	51	37	6,175	55	7.12	3.05	2.33	0.89	18.5	7.9	1.36	.307	4.54	9.23
16	Astros	4.36	2008	161	.534	86	75	161	1,095	4	3	48	1425.1	1,453	691	743	197	492	50	53	6,125	22	6.91	3.11	2.23	1.24	17.9	8.0	1.36	.293	4.69	9.17
17	Giants	4.38	2008	162	.444	72	90	162	1,240	4	2	41	1442.0	1,416	701	759	147	652	70	59	6,341	77	7.74	4.07	1.90	0.92	19.6	10.3	1.43	.300	4.74	8.84
18	Padres	4.41	2008	162	.389	63	99	162	1,100	3	0	30	1458.1	1,466	714	764	165	561	38	61	6,286	43	6.79	3.46	1.96	1.02	17.5	8.9	1.39	.294	4.71	9.05
19	Marlins	4.43	2008	161	.522	84	77	161	1,127	2	1	36	1435.1	1,421	707	767	161	586	58	66	6,271	59	7.07	3.67	1.92	1.01	18.0	9.3	1.40	.290	4.81	8.91
20	Indians	4.45	2008	162	.500	81	81	162	986	10	5	31	1437.0	1,530	711	761	170	444	51	28	6,164	44	6.18	2.78	2.22	1.06	16.0	7.2	1.37	.301	4.77	9.58
21	Braves	4.46	2008	162	.444	72	90	162	1,076	2	1	26	1440.2	1,439	714	778	156	586	42	80	6,244	42	6.72	3.66	1.84	0.97	17.2	9.4	1.41	.293	4.86	8.99
22	Royals	4.48	2008	162	.463	75	87	162	1,085	2	0	44	1445.2	1,473	720	781	159	515	41	15	6,214	68	6.75	3.21	2.11	0.99	17.5	8.3	1.38	.298	4.86	9.17
23	Reds	4.55	2008	162	.457	74	88	162	1,227	2	1	34	1442.1	1,542	729	800	201	557	67	40	6,352	52	7.66	3.48	2.20	1.25	19.3	8.8	1.46	.312	4.99	9.62
24	Nationals	4.66	2008	161	.366	59	102	161	1,063	2	0	28	1434.0	1,496	742	825	190	588	51	44	6,310	59	6.67	3.69	1.81	1.19	16.8	9.3	1.45	.296	5.18	9.39
25	Mariners	4.73	2008	162	.377	61	101	162	1,016	4	0	36	1435.1	1,544	754	811	161	626	53	37	6,368	60	6.37	3.93	1.62	1.01	16.0	9.8	1.51	.307	5.09	9.68