most era by the whole league in a MLB season

	LEAGUE	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	NL	5.33	1894	1,598	.500	783	783	1,598	3,333	1,299		37	13831.1	17,809	8,187	11,796	629	5,868	602		64,114	488	2.17	3.82	0.57	0.41	5.2	9.2	1.71	.320	7.68	11.59
2	AL	5.04	1936	1,236	.500	612	612	1,236	4,033	585	55	100	10933.1	12,655	6,120	7,008	758	4,855	194		49,447	325	3.32	4.00	0.83	0.62	8.2	9.8	1.60	.300	5.77	10.42
3	AL	4.99	1996	2,266	.500	1,132	1,132	2,266	14,056	163	41	536	20271.2	21,922	11,241	12,208	2,742	8,592	721	609	89,734	771	6.24	3.81	1.64	1.22	15.7	9.6	1.51	.301	5.42	9.73
4	NL	4.97	1930	1,236	.500	616	616	1,236	3,850	534	51	119	10949.2	13,259	6,049	7,025	892	3,687	202		48,871	196	3.16	3.03	1.04	0.73	7.9	7.5	1.55	.307	5.77	10.90
5	AL	4.91	2000	2,265	.505	1,143	1,122	2,265	14,033	107	34	551	20141.0	21,622	10,992	11,950	2,696	8,390	681	466	88,949	692	6.27	3.75	1.67	1.20	15.8	9.4	1.49	.300	5.34	9.66
6	AL	4.86	1999	2,265	.496	1,122	1,141	2,265	13,913	109	27	570	20076.2	21,539	10,832	11,853	2,619	8,296	795	428	88,528	748	6.24	3.72	1.68	1.17	15.7	9.4	1.49	.301	5.31	9.66
7	AL	4.80	1994	1,594	.500	797	797	1,594	9,619	153	39	366	14229.2	15,048	7,587	8,330	1,774	5,938	425	449	62,553	614	6.08	3.76	1.62	1.12	15.4	9.5	1.47	.296	5.27	9.52
8	AL	4.79	1938	1,226	.500	605	605	1,226	4,255	570	45	95	10745.0	11,934	5,718	6,582	864	4,924	164		48,266	223	3.56	4.12	0.86	0.72	8.8	10.2	1.57	.291	5.51	10.00
9	NL	4.77	1895	1,598	.500	783	783	1,598	3,623	1,287		45	13807.0	16,827	7,322	10,514	488	5,120	668		62,634	396	2.36	3.34	0.71	0.32	5.8	8.2	1.59	.310	6.85	10.97
10	AL	4.71	1995	2,020	.500	1,009	1,009	2,020	12,116	151	38	493	17976.0	18,791	9,413	10,225	2,164	7,572	595	492	78,878	720	6.07	3.79	1.60	1.08	15.4	9.6	1.47	.295	5.12	9.41
11	NL	4.71	1929	1,232	.500	611	611	1,232	3,472	567	55	113	10937.1	12,670	5,725	6,613	754	3,945	211		48,524	164	2.86	3.25	0.88	0.62	7.2	8.1	1.52	.297	5.44	10.43
12	NL	4.66	1893	1,570	.500	773	773	1,570	3,342	1,294		32	13864.1	15,913	7,180	10,315	460	6,143	639		63,724	521	2.17	3.99	0.54	0.30	5.2	9.6	1.59	.291	6.70	10.33
13	AL	4.65	1998	2,268	.501	1,135	1,131	2,268	14,341	141	44	590	20194.2	21,210	10,430	11,354	2,479	7,704	766	421	88,118	768	6.39	3.43	1.86	1.10	16.3	8.7	1.43	.298	5.06	9.45
14	AL	4.65	1930	1,232	.500	616	616	1,232	4,081	561	41	110	10912.1	12,343	5,635	6,664	673	3,958	200		48,311	172	3.37	3.26	1.03	0.56	8.4	8.2	1.49	.296	5.50	10.18
15	AL	4.63	2004	2,266	.500	1,134	1,132	2,266	14,505	79	33	533	20248.0	21,151	10,416	11,316	2,591	7,520	904	514	88,280	720	6.45	3.34	1.93	1.15	16.4	8.5	1.42	.296	5.03	9.40
16	NL	4.63	2000	2,593	.496	1,285	1,306	2,593	17,323	127	38	627	23103.1	23,624	11,884	13,021	2,997	9,847	892	744	101,312	826	6.75	3.84	1.76	1.17	17.1	9.7	1.45	.294	5.07	9.20
17	AL	4.62	1937	1,244	.500	613	613	1,244	4,454	556	58	113	10952.2	12,178	5,624	6,502	806	4,778	162		48,875	201	3.66	3.93	0.93	0.66	9.1	9.8	1.55	.294	5.34	10.01
18	AL	4.62	1939	1,230	.500	611	611	1,230	4,320	512	53	127	10877.0	11,866	5,583	6,404	796	4,660	148		48,458	244	3.57	3.86	0.93	0.66	8.9	9.6	1.52	.287	5.30	9.82
19	AL	4.60	2019	2,428	.493	1,198	1,230	2,428	21,241	27	15	573	21690.2	21,310	11,097	12,018	3,490	7,921	963	271	93,447	1,005	8.81	3.29	2.68	1.45	22.7	8.5	1.35	.298	4.99	8.84
20	AL	4.58	1950	1,240	.500	616	616	1,240	4,558	500	59	154	10963.0	11,474	5,577	6,253	973	5,418	216		48,734	214	3.74	4.45	0.84	0.80	9.4	11.1	1.54	.280	5.13	9.42
21	AL	4.56	1997	2,264	.496	1,122	1,142	2,264	14,440	123	39	568	20198.1	21,281	10,242	11,177	2,468	7,859	680	546	88,144	785	6.43	3.50	1.84	1.10	16.4	8.9	1.44	.300	4.98	9.48
22	NL	4.56	1999	2,591	.504	1,305	1,286	2,591	17,206	128	37	647	23134.2	23,788	11,722	12,838	2,909	9,595	784	679	101,164	884	6.69	3.73	1.79	1.13	17.0	9.5	1.44	.295	4.99	9.25
23	AL	4.56	2006	2,268	.512	1,162	1,106	2,268	14,397	66	25	583	20121.0	21,327	10,188	11,041	2,518	7,128	779	528	87,385	755	6.44	3.19	2.02	1.13	16.5	8.2	1.41	.301	4.94	9.54
24	AL	4.52	2003	2,270	.495	1,123	1,145	2,270	13,735	110	31	537	20225.0	20,905	10,167	11,061	2,500	7,111	893	522	87,526	682	6.11	3.16	1.93	1.11	15.7	8.1	1.39	.291	4.92	9.30
25	AL	4.50	2007	2,268	.505	1,145	1,123	2,268	14,890	64	27	554	20178.1	21,047	10,099	10,934	2,256	7,439	813	534	87,648	754	6.64	3.32	2.00	1.01	17.0	8.5	1.41	.302	4.88	9.39