most earned runs allowed in a season by a player in mlb history

John Coleman has allowed the most earned runs in a season, with 291 earned runs in his rookie season in 1883.

	NAME	ER	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	John Coleman J. Coleman	291	1883	PHN	65	12	48	.200	61	4.87	159	59	3	0	538.1	772	510	17	48		4	2,546	9	2.66	0.80	3.31	0.28	6.2	1.9	1.52		8.53	158	3.34	109	12.91	-19.2
2	Ted Breitenstein T. Breitenstein	238	1894	STL	56	27	23	.540	50	4.79	140	46	1	0	447.1	497	320	21	191	11	4	1,987	5	2.82	3.84	0.73	0.42	7.0	9.6	1.54	.293	6.44	91	5.15	98	10.00	4.9
3	Red Donahue R. Donahue	237	1897	STL	46	10	35	.222	42	6.13	64	38	1	1	348.0	485	306	16	106	22	4	1,612	9	1.66	2.74	0.60	0.41	4.0	6.6	1.70	.334	7.91	140	4.65	106	12.54	-8.7
4	Al Mays A. Mays	232	1887	NYM	52	17	34	.333	52	4.73	124	50	0	0	441.1	551	359	11	136	20	1	2,002	36	2.53	2.77	0.91	0.22	6.2	6.8	1.56	.316	7.32	113	4.10	102	11.24	-5.5
5	Kid Carsey K. Carsey	230	1891	WSH	54	14	37	.275	53	4.99	174	46	1	0	415.0	513	358	17	161	28	1	1,937	29	3.77	3.49	1.08	0.37	9.0	8.3	1.62	.319	7.76	133	3.59	99	11.13	2.3
6	Gus Weyhing G. Weyhing	221	1887	PHA	55	26	28	.481	55	4.27	193	53	2	0	466.1	465	342	12	167	37	0	2,042	49	3.72	3.22	1.16	0.23	9.5	8.2	1.36	.277	6.60	99	4.10	99	8.97	1.2
7	Henry Porter H. Porter	219	1888	KCC	55	18	37	.327	54	4.16	145	53	4	0	474.0	527	336	16	120	23	1	2,084	24	2.75	2.28	1.21	0.30	7.0	5.8	1.36	.287	6.38	127	3.32	106	10.01	-1.6
8	Matt Kilroy M. Kilroy	218	1886	BAL	68	29	34	.460	68	3.37	513	66	5	0	583.0	476	350	10	182	19	0	2,469	61	7.92	2.81	2.82	0.15	20.8	7.4	1.13	.267	5.40	100	2.60	77	7.35	47
9	Tony Mullane T. Mullane	218	1886	CIN	63	33	27	.550	56	3.70	250	55	1	0	529.2	501	315	11	166	18	7	2,258	53	4.25	2.82	1.51	0.19	11.1	7.4	1.26	.270	5.35	107	3.47	100	8.51	0.7
10	Ed Seward E. Seward	216	1887	PHA	55	25	25	.500	52	4.13	155	52	3	0	470.2	445	293	7	140	24	2	1,990	58	2.96	2.68	1.11	0.13	7.8	7.0	1.24	.263	5.60	96	3.86	94	8.51	13.7
11	Kid Nichols K. Nichols	215	1894	BSN	50	32	13	.711	46	4.75	113	40	3	0	407.0	488	308	23	121	9	4	1,790	14	2.50	2.68	0.93	0.51	6.3	6.8	1.50	.305	6.81	85	4.95	89	10.79	32.7
12	Old Hoss Radbourn O. Hoss Radbourn	215	1887	BSN	50	24	23	.511	50	4.55	87	48	1	0	425.0	505	305	21	133	14	0	1,915	20	1.84	2.82	0.65	0.44	4.5	6.9	1.50	.292	6.46	115	4.55	110	10.69	-21.7
13	Stump Wiedman S. Wiedman	215	1886	KCC	51	12	36	.250	51	4.52	168	48	1	0	427.2	549	323	11	112		0	1,924	35	3.54	2.36	1.50	0.23	8.7	5.8	1.55		6.80	129	3.44	97	11.55	11.8
14	Pink Hawley P. Hawley	214	1894	STL	53	19	27	.413	41	4.90	120	36	0	0	392.2	481	306	14	149	21	10	1,782	21	2.75	3.42	0.81	0.32	6.7	8.4	1.60	.316	7.01	93	4.97	94	11.02	12.5
15	Toad Ramsey T. Ramsey	214	1887	LOU	65	37	27	.578	64	3.43	355	61	0	0	561.0	544	358	9	167	16	1	2,430	46	5.70	2.68	2.13	0.14	14.6	6.9	1.27	.284	5.74	78	3.20	76	8.73	64.2
16	Ted Breitenstein T. Breitenstein	213	1895	STL	55	19	30	.388	51	4.37	131	47	1	1	438.2	468	299	16	182	14	4	1,936	4	2.69	3.73	0.72	0.33	6.8	9.4	1.48	.284	6.13	92	4.80	102	9.60	-4.6
17	George Cobb G. Cobb	213	1892	BAL	53	10	37	.213	47	4.86	159	42	0	0	394.1	495	333	21	140	19	6	1,836	15	3.63	3.20	1.14	0.48	8.7	7.6	1.61	.317	7.60	145	3.53	105	11.30	-6.1
18	Billy Crowell B. Crowell	211	1887	CLE	45	14	31	.311	45	4.88	72	45	1	0	389.1	541	350	9	138	20	0	1,812	23	1.66	3.19	0.52	0.21	4.0	7.6	1.74	.338	8.09	114	4.42	107	12.51	-13.2
19	Phenomenal Smith P. Smith	207	1887	BAL	58	25	30	.455	55	3.79	206	54	1	0	491.1	526	369	7	176	14	3	2,204	12	3.77	3.22	1.17	0.13	9.3	8.0	1.43	.288	6.76	90	3.78	94	9.64	11.4
20	Mark Baldwin M. Baldwin	206	1889	COL	63	27	34	.443	59	3.61	368	54	6	1	513.2	458	358	9	274	20	4	2,275	83	6.45	4.80	1.34	0.16	16.2	12.0	1.43	.280	6.27	100	3.52	98	8.02	-3
21	Fleury Sullivan F. Sullivan	206	1884	PIT	51	16	35	.314	51	4.20	189	51	2	0	441.0	496	328	15	96	20	0	1,967	25	3.86	1.96	1.97	0.31	9.6	4.9	1.34	.292	6.69	131	3.65	115	10.12	-24.7
22	Bill Hart B. Hart	205	1897	STL	39	9	27	.250	38	6.26	67	31	0	0	294.2	395	292	10	148	16	1	1,405	15	2.05	4.52	0.45	0.31	4.8	10.5	1.84	.331	8.92	143	4.98	113	12.06	-17.7
23	Ed Beatin E. Beatin	202	1890	CLN	54	22	30	.423	54	3.83	155	53	1	0	474.1	518	300	11	186	15	0	2,127	17	2.94	3.53	0.83	0.21	7.3	8.7	1.48	.288	5.69	108	3.83	101	9.83	-1.1
24	Matt Kilroy M. Kilroy	201	1887	BAL	69	46	19	.708	69	3.07	217	66	6	0	589.1	585	326	9	157	20	1	2,492	46	3.31	2.40	1.38	0.14	8.7	6.3	1.26	.276	4.98	73	3.64	90	8.93	23.3
25	Frank Mountain F. Mountain	201	1883	COL	59	26	33	.441	59	3.60	159	57	4	0	503.0	546	345	8	123		0	2,230	21	2.84	2.20	1.29	0.14	7.1	5.5	1.33		6.17	115	3.56	114	9.77	-33.3