which pitchers had the lowest single season era with a minimum 30 games started that season

Mordecai Brown has the best ERA with 30+ starts in a season, with an ERA of 1.04 in 1906.

	NAME	ERA	GS	SEASON	TM	G	W	L	W%	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Mordecai Brown M. Brown	1.04	32	1906	CHC	36	26	6	.813	144	27	9	3	277.1	198	32	56	1	61	4	4		1,044	2	4.67	1.98	2.36	0.03	13.8	5.8	0.93	.236	1.82	39	2.08	75	6.43	21.1
2	Bob Gibson B. Gibson	1.12	34	1968	STL	34	22	9	.710	268	28	13	0	304.2	198	38	49	11	62	7	0	6	1,161	4	7.92	1.83	4.32	0.32	23.1	5.3	0.85	.230	1.45	38	1.77	63	5.85	34.8
3	Christy Mathewson C. Mathewson	1.14	33	1909	NYG	37	25	6	.806	149	26	8	2	275.1	192	35	57	2	36	0	4		998	4	4.87	1.18	4.14	0.07	14.9	3.6	0.83	.234	1.86	44	1.62	61	6.28	31.7
4	Walter Johnson W. Johnson	1.14	36	1913	WSH	48	36	7	.837	243	29	11	2	346.0	232	44	56	9	38	9	10		1,271	2	6.32	0.99	6.39	0.23	19.1	3.0	0.78	.229	1.46	39	1.90	63	6.03	42.3
5	Addie Joss A. Joss	1.16	35	1908	CLE	42	24	11	.686	130	29	9	2	325.0	232	42	77	2	30	2	6		1,209	6	3.60	0.83	4.33	0.06	10.8	2.5	0.81	.220	2.13	49	1.68	76	6.42	19.3
6	Grover Alexander G. Alexander	1.22	42	1915	PHN	49	31	10	.756	241	36	12	3	376.1	253	51	86	3	64	10	7		1,435	2	5.76	1.53	3.77	0.07	16.8	4.5	0.84	.224	2.06	43	1.82	63	6.05	44.1
7	George Bradley G. Bradley	1.23	64	1876	STL	64	45	19	.703	103	63	16	0	573.0	470	78	229	3	38		0		2,269	34	1.62	0.60	2.71	0.05	4.5	1.7	0.89		3.60	58	2.14	101	7.38	-20.7
8	Cy Young C. Young	1.26	33	1908	BOS	36	21	11	.656	150	30	3	2	299.0	230	42	68	1	37	1	3		1,116	4	4.52	1.11	4.05	0.03	13.4	3.3	0.89	.247	2.05	52	1.52	67	6.92	25.4
9	Ed Walsh E. Walsh	1.27	36	1910	CWS	45	18	20	.474	258	33	7	5	369.2	242	52	87	5	61	4	7		1,359	6	6.28	1.49	4.23	0.12	19.0	4.5	0.82	.230	2.12	52	1.63	66	5.89	34.8
10	Christy Mathewson C. Mathewson	1.28	37	1905	NYG	43	31	9	.775	206	32	8	3	338.2	252	48	85	4	64	1	6		1,294	6	5.47	1.70	3.22	0.11	15.9	4.9	0.93	.243	2.26	42	2.03	69	6.70	34.9
11	Jack Taylor J. Taylor	1.29	34	1902	CHO	37	23	11	.676	88	34	8	1	333.2	273	48	86	2	45	12	3		1,278	10	2.37	1.21	1.96	0.05	6.9	3.5	0.95	.240	2.32	49	2.73	98	7.36	0.6
12	Jack Coombs J. Coombs	1.30	38	1910	PHA	45	31	9	.775	224	35	13	1	353.0	248	51	74	0	115	7	6		1,353	10	5.71	2.93	1.95	0.00	16.6	8.5	1.03	.246	1.89	53	2.09	83	6.32	15.8
13	Mordecai Brown M. Brown	1.31	34	1909	CHC	50	27	9	.750	172	32	8	7	342.2	246	50	78	1	53	7	15		1,280	9	4.52	1.39	3.25	0.03	13.4	4.1	0.87	.234	2.05	51	1.78	68	6.46	32.4
14	Walter Johnson W. Johnson	1.36	42	1910	WSH	45	25	17	.595	313	38	8	1	370.0	262	56	92	1	76	13	3		1,367	21	7.61	1.85	4.12	0.02	22.9	5.6	0.91	.271	2.24	56	1.39	56	6.37	45.2
15	Old Hoss Radbourn O. Hoss Radbourn	1.38	73	1884	PRO	75	59	12	.831	441	73	11	2	678.2	528	104	216	18	98		2		2,672	34	5.85	1.30	4.50	0.24	16.5	3.7	0.92		2.86	48	2.75	84	7.00	31.9
16	Walter Johnson W. Johnson	1.39	37	1912	WSH	50	33	12	.733	303	34	7	2	369.0	259	57	89	2	76	16	13		1,413	11	7.39	1.85	3.99	0.05	21.4	5.4	0.91	.253	2.17	42	2.03	63	6.32	49.6
17	Ed Walsh E. Walsh	1.42	49	1908	CWS	66	40	15	.727	269	42	11	6	464.0	343	73	111	2	56	9	16		1,755	10	5.22	1.09	4.80	0.04	15.3	3.2	0.86	.240	2.15	63	1.42	67	6.65	34.2
18	Orval Overall O. Overall	1.42	32	1909	CHC	38	20	11	.645	205	23	9	3	285.0	204	45	66	1	80	8	6		1,116	11	6.47	2.53	2.56	0.03	18.4	7.2	1.00	.247	2.08	55	1.75	67	6.44	27.8
19	Christy Mathewson C. Mathewson	1.43	44	1908	NYG	56	37	11	.771	259	34	11	5	390.2	281	62	85	5	42	3	9		1,469	2	5.97	0.97	6.17	0.12	17.6	2.9	0.83	.238	1.96	61	1.29	52	6.47	52.4
20	Mordecai Brown M. Brown	1.47	31	1908	CHC	44	29	9	.763	123	27	9	5	312.1	214	51	64	1	49	5	12		1,153	6	3.54	1.41	2.51	0.03	10.7	4.2	0.84	.218	1.84	63	1.87	75	6.17	21.5
21	Rube Waddell R. Waddell	1.48	34	1905	PHA	46	27	10	.730	287	27	7	0	328.2	231	54	86	5	90	10	11		1,257	10	7.86	2.46	3.19	0.14	22.8	7.2	0.98	.261	2.35	55	1.89	69	6.33	31.2
22	John Ward J. Ward	1.51	37	1878	PRO	37	22	13	.629	116	37	6	0	334.0	308	56	151	3	34		0		1,365	26	3.13	0.92	3.41	0.08	8.5	2.5	1.02		4.07	68	2.26	101	8.30	-4.4
23	George McQuillan G. McQuillan	1.53	42	1908	PHN	48	23	17	.575	114	32	7	2	359.2	263	61	88	1	91	6	6		1,367	5	2.85	2.28	1.25	0.03	8.3	6.7	0.98	.227	2.20	66	2.31	95	6.58	4.5
24	Dwight Gooden D. Gooden	1.53	35	1985	NYM	35	24	4	.857	268	16	8	0	276.2	198	47	51	13	69	2	0	4	1,065	6	8.72	2.24	3.88	0.42	25.2	6.5	0.97	.259	1.66	44	2.12	59	6.44	45.6
25	Eddie Cicotte E. Cicotte	1.53	35	1917	CWS	49	28	12	.700	150	29	7	4	346.2	246	59	76	2	70	3	11		1,287	1	3.89	1.82	2.14	0.05	11.7	5.4	0.91	.230	1.97	58	2.10	76	6.39	26.2