player with highest era in a season since 1947, minimum 50 ip

Since 1947, Roy Halladay has the worst ERA with 50.0+ innings pitched in a season, with an ERA of 10.64 in 2000.

	NAME	ERA	IP	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	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	Roy Halladay R. Halladay	10.64	67.2	2000	TOR	19	4	7	.364	13	44	0	0	0	107	80	87	14	42	2	4	0	349	6	5.85	5.59	1.05	1.86	12.6	12.0	2.20	.377	11.57	212	6.47	134	14.23	-12.3
2	Micah Bowie M. Bowie	10.24	51.0	1999	TOT	14	2	7	.222	11	41	0	0	0	81	58	60	9	34	2	2	2	265	4	7.24	6.00	1.21	1.59	15.5	12.8	2.25	.402	10.59	225	5.93	127	14.29	-7.1
3	Steve Blass S. Blass	9.85	88.2	1973	PIT	23	3	9	.250	18	27	1	0	0	109	97	98	11	84	12	1	4	455	9	2.74	8.53	0.32	1.12	5.9	18.5	2.18	.305	9.95	277	6.81	191	11.06	-33.1
4	Sean Bergman S. Bergman	9.66	68.0	2000	MIN	15	4	5	.444	14	35	0	0	0	111	73	76	18	33	2	0	1	337	2	4.63	4.37	1.06	2.38	10.4	9.8	2.12	.373	10.06	193	7.08	150	14.69	-18.2
5	Andy Larkin A. Larkin	9.64	74.2	1998	FLA	17	3	8	.273	14	43	0	0	0	101	80	87	12	55	4	0	3	373	3	5.18	6.63	0.78	1.45	11.5	14.7	2.09	.344	10.49	237	6.44	153	12.17	-18.9
6	Edwin Jackson E. Jackson	9.58	67.2	2019	TOT	18	3	10	.231	13	52	0	0	0	105	72	81	23	32	3	0	0	336	6	6.92	4.26	1.63	3.06	15.5	9.5	2.02	.363	10.77	209	7.64	166	13.97	-22.8
7	Alfredo Simon A. Simon	9.36	58.2	2016	CIN	15	2	7	.222	11	39	0	0	0	89	61	64	15	31	8	1	2	298	3	5.98	4.76	1.26	2.30	13.1	10.4	2.05	.361	9.82	220	7.13	168	13.65	-18.2
8	Dallas Keuchel D. Keuchel	9.20	60.2	2022	TOT	14	2	9	.182	14	45	0	0	0	94	62	69	11	31	0	0	2	303	3	6.68	4.60	1.45	1.63	14.9	10.2	2.06	.384	10.24	232	5.51	137	13.95	-9.8
9	Bradley Blalock B. Blalock	9.16	55.0	2025	COL	13	2	5	.286	11	26	0	0	0	79	56	56	16	21	2	2	0	255	2	4.25	3.44	1.24	2.62	10.2	8.2	1.82	.332	9.16	192	7.22	166	12.93	-16.6
10	Todd Van Poppel T. Van Poppel	9.06	99.1	1996	TOT	37	3	9	.250	15	53	1	1	1	139	100	107	24	62	3	8	3	491	7	4.80	5.62	0.85	2.17	10.8	12.6	2.02	.330	9.69	184	7.20	145	12.59	-24.6
11	Bryan Rekar B. Rekar	8.95	58.1	1996	COL	14	2	4	.333	11	25	0	0	0	87	58	61	11	26	5	0	1	289	4	3.86	4.01	0.96	1.70	8.7	9.0	1.94	.342	9.41	173	6.35	133	13.42	-9
12	Joe Mays J. Mays	8.70	50.2	2006	TOT	13	0	5	.000	10	25	0	0	0	78	49	56	11	26	0	0	2	250	6	4.44	4.62	0.96	1.95	10.0	10.4	2.05	.356	9.95	191	6.51	143	13.86	-11
13	Luis Mendoza L. Mendoza	8.67	63.1	2008	TEX	25	3	8	.273	11	35	0	0	1	97	61	74	7	25	6	6	4	316	5	4.97	3.55	1.40	0.99	11.1	7.9	1.93	.370	10.52	194	4.92	112	13.78	-3.5
14	Mark Clark M. Clark	8.60	74.1	1999	TEX	15	3	7	.300	15	44	0	0	0	103	71	73	17	34	1	0	1	353	7	5.33	4.12	1.29	2.06	12.5	9.6	1.84	.335	8.84	172	6.32	129	12.47	-11.6
15	Ron Davis R. Davis	8.59	58.2	1986	TOT	53	2	8	.200	0	40	0	0	2	86	56	60	10	32	4	33	8	289	4	6.14	4.91	1.25	1.53	13.8	11.1	2.01	.374	9.20	205	5.45	133	13.19	-8.8
16	Miguel Batista M. Batista	8.54	65.1	2000	TOT	18	2	7	.222	9	37	0	0	0	85	62	68	19	37	2	2	2	310	4	5.10	5.10	1.00	2.62	11.9	11.9	1.87	.307	9.37	168	7.56	153	11.71	-18.5
17	Jesse Jefferson J. Jefferson	8.52	62.1	1976	CWS	19	2	5	.286	9	30	0	0	0	86	59	62	4	42	2	5	0	307	4	4.33	6.06	0.71	0.58	9.8	13.7	2.05	.358	8.95	240	4.62	132	12.42	-7.9
18	Bobby Miller B. Miller	8.52	56.0	2024	LAD	13	2	4	.333	13	52	0	0	0	69	53	53	17	30	2	0	0	258	7	8.36	4.82	1.73	2.73	20.2	11.6	1.77	.331	8.52	210	6.96	168	11.09	-17.2
19	Joe Coleman J. Coleman	8.50	54.0	1950	PHA	15	0	5	.000	6	12	2	0	0	74	51	54	9	50	0	7		278	2	2.00	8.33	0.24	1.50	4.3	18.0	2.30	.314	9.00	184	7.08	158	12.33	-15.4
20	Josh Towers J. Towers	8.42	62.0	2006	TOR	15	2	10	.167	12	35	0	0	0	93	58	62	17	17	3	1	3	295	1	5.08	2.47	2.06	2.47	11.9	5.8	1.77	.341	9.00	183	6.54	144	13.50	-13.5
21	Mike DeJean M. DeJean	8.41	61.0	1999	COL	56	2	4	.333	0	31	0	0	0	83	57	61	13	32	2	17	8	288	3	4.57	4.72	0.97	1.92	10.8	11.1	1.89	.333	9.00	151	6.55	129	12.25	-8.8
22	Kyle Davies K. Davies	8.38	63.1	2006	ATL	14	3	7	.300	14	51	1	0	0	90	59	60	14	33	3	0	0	312	3	7.25	4.69	1.55	1.99	16.3	10.6	1.94	.360	8.53	187	6.11	136	12.79	-11.6
23	Jimmy Haynes J. Haynes	8.29	89.0	1996	BAL	26	3	6	.333	11	65	0	0	1	122	82	84	14	58	2	8	1	435	5	6.57	5.87	1.12	1.42	14.9	13.3	2.02	.365	8.49	168	5.77	117	12.34	-8.5
24	J.C. Mejía	8.25	52.1	2021	CLE	17	1	7	.125	11	47	0	0	0	60	48	48	13	24	3	1	0	238	2	8.08	4.13	1.96	2.24	19.7	10.1	1.61	.311	8.25	195	6.14	147	10.32	-11.6
25	Hideo Nomo H. Nomo	8.25	84.0	2004	LAD	18	4	11	.267	18	54	0	0	0	105	77	77	19	42	4	0	1	393	3	5.79	4.50	1.29	2.04	13.7	10.7	1.75	.314	8.25	200	6.34	144	11.25	-18.1