fewest earned runs allowed in a season by a pitcher with at least 220 innings thrown

Dutch Leonard has allowed the fewest earned runs with 220.0+ innings pitched in a season, with 24 earned runs in 1914.

	NAME	ER	IP	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	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	Dutch Leonard D. Leonard	24	224.2	1914	BSA	36	19	5	.792	25	0.96	176	17	7	3	139	34	3	60	8	8		842	2	7.05	2.40	2.93	0.12	20.9	7.1	0.89	.229	1.36	36	1.95	70	5.57	20.4
2	Mordecai Brown M. Brown	32	277.1	1906	CHC	36	26	6	.813	32	1.04	144	27	9	3	198	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
3	Christy Mathewson C. Mathewson	35	275.1	1909	NYG	37	25	6	.806	33	1.14	149	26	8	2	192	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	Ed Walsh E. Walsh	36	230.1	1909	CWS	31	15	11	.577	28	1.41	127	20	8	2	166	52	0	50	4	3		871	4	4.96	1.95	2.54	0.00	14.6	5.7	0.94	.241	2.03	61	1.82	81	6.49	10.3
5	Mordecai Brown M. Brown	36	233.0	1907	CHC	34	20	6	.769	27	1.39	107	20	6	3	180	51	2	40	6	7		861	4	4.13	1.55	2.68	0.08	12.4	4.6	0.94	.252	1.97	56	1.97	75	6.95	17.2
6	Bob Gibson B. Gibson	38	304.2	1968	STL	34	22	9	.710	34	1.12	268	28	13	0	198	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
7	Fred Toney F. Toney	39	222.2	1915	CIN	36	17	6	.739	23	1.58	108	18	6	2	160	46	1	73	3	10		877	2	4.37	2.95	1.48	0.04	12.3	8.3	1.05	.230	1.86	57	2.52	89	6.47	7.7
8	Zack Greinke Z. Greinke	41	222.2	2015	LAD	32	19	3	.864	32	1.66	200	1	0	0	148	43	14	40	5	0	1	843	7	8.08	1.62	5.00	0.57	23.7	4.7	0.84	.229	1.74	44	2.75	73	5.98	26.2
9	Howie Camnitz H. Camnitz	41	236.2	1908	PIT	38	16	9	.640	26	1.56	118	17	3	2	182	76	6	69	5	10		942	2	4.49	2.62	1.71	0.23	12.5	7.3	1.06	.237	2.89	66	2.37	95	6.92	3.2
10	Addie Joss A. Joss	42	325.0	1908	CLE	42	24	11	.686	35	1.16	130	29	9	2	232	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
11	Cy Young C. Young	42	299.0	1908	BOS	36	21	11	.656	33	1.26	150	30	3	2	230	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
12	Jack Pfiester J. Pfiester	42	250.2	1906	CHC	31	20	8	.714	29	1.51	153	20	4	0	173	63	3	63	13	2		966	4	5.49	2.26	2.43	0.11	15.8	6.5	0.94	.232	2.26	57	2.21	80	6.21	15.4
13	Sandy Koufax S. Koufax	43	223.0	1964	LAD	29	19	5	.792	28	1.74	223	15	7	1	154	49	13	53	0	1	5	870	9	9.00	2.14	4.21	0.52	25.6	6.1	0.93	.243	1.98	53	2.08	67	6.22	27.1
14	Walter Johnson W. Johnson	44	346.0	1913	WSH	48	36	7	.837	36	1.14	243	29	11	2	232	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
15	Chief Bender C. Bender	44	250.0	1910	PHA	30	23	5	.821	28	1.58	155	25	3	0	182	63	1	47	10	2		936	7	5.58	1.69	3.30	0.04	16.6	5.0	0.92	.250	2.27	65	1.82	72	6.55	19
16	Ray Collins R. Collins	44	244.2	1910	BSA	35	13	11	.542	26	1.62	109	18	4	1	205	73	1	41	1	9		937	1	4.01	1.51	2.66	0.04	11.6	4.4	1.01	.260	2.69	64	2.00	76	7.54	16.9
17	Jake Arrieta J. Arrieta	45	229.0	2015	CHC	33	22	6	.786	33	1.77	236	4	3	0	150	52	10	48	6	0	2	870	6	9.28	1.89	4.92	0.39	27.1	5.5	0.86	.246	2.04	45	2.34	60	5.90	39
18	Grover Alexander G. Alexander	45	235.0	1919	CHC	30	16	11	.593	27	1.72	121	20	9	1	180	51	3	38	0	3		906	1	4.63	1.46	3.18	0.11	13.4	4.2	0.93	.238	1.95	58	2.11	70	6.89	23.6
19	Ernie Shore E. Shore	45	247.0	1915	BSA	38	19	8	.704	32	1.64	102	17	4	0	207	75	3	66	4	3		978	4	3.72	2.40	1.55	0.11	10.4	6.7	1.11	.254	2.73	57	2.59	89	7.54	8.2
20	Hippo Vaughn H. Vaughn	45	221.2	1910	NYH	30	13	11	.542	25	1.83	107	18	5	1	190	76	1	58	10	3		869	7	4.34	2.35	1.84	0.04	12.3	6.7	1.12	.273	3.09	69	2.34	86	7.71	10.3
21	Orval Overall O. Overall	45	285.0	1909	CHC	38	20	11	.645	32	1.42	205	23	9	3	204	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
22	Doc White D. White	45	228.0	1904	CWS	30	16	12	.571	30	1.78	115	23	7	0	201	82	6	68	9	0		923	4	4.54	2.68	1.69	0.24	12.5	7.4	1.18	.269	3.24	73	2.77	117	7.93	-12.8
23	Luis Tiant L. Tiant	46	258.1	1968	CLE	34	21	9	.700	32	1.60	264	19	9	0	152	53	16	73	4	0	4	987	3	9.20	2.54	3.62	0.56	26.7	7.4	0.87	.216	1.85	53	2.04	64	5.30	33
24	Spud Chandler S. Chandler	46	253.0	1943	NYY	30	20	4	.833	30	1.64	134	20	5	0	197	62	5	54	4	0		989	3	4.77	1.92	2.48	0.18	13.5	5.5	0.99	.242	2.21	50	2.30	68	7.01	29.8
25	Walter Johnson W. Johnson	46	326.0	1918	WSH	39	23	13	.639	29	1.27	162	29	8	3	241	71	2	70	8	10		1,261	8	4.47	1.93	2.31	0.06	12.8	5.6	0.95	.235	1.96	47	2.04	74	6.65	25.9