Les Sweetland has the highest ERA with 150.0+ innings pitched in a season, with an ERA of 7.71 in 1930.

Interpreted as:

highest era by a player + in a season with 150+ IP

	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	Les Sweetland L. Sweetland	7.71	167.0	1930	PHN	34	7	15	.318	25	36	8	1	0	271	143	164	24	60	5	5		817	0	1.94	3.23	0.60	1.29	4.4	7.3	1.98	.357	8.84	141	6.11	113	14.60	-10.3
2	William Rotes W. Rotes	7.60	151.2	1893	LOU	20	5	12	.294	19	22	17	0	0	244	128	173	10	66	10	1		769	1	1.31	3.92	0.33	0.59	2.9	8.6	2.04	.354	10.27	170	5.31	119	14.48	-16.2
3	Jack Wadsworth J. Wadsworth	7.60	173.0	1894	LOU	22	4	18	.182	22	57	20	0	0	261	146	204	10	103	4	0		866	13	2.97	5.36	0.55	0.52	6.6	11.9	2.10	.363	10.61	149	5.76	113	13.58	-14.9
4	Claude Willoughby C. Willoughby	7.59	153.0	1930	PHN	41	4	17	.190	24	38	5	1	1	241	129	147	17	68	2	8		744	3	2.24	4.00	0.56	1.00	5.1	9.1	2.02	.362	8.65	139	5.82	108	14.18	-5
5	Jim Walkup J. Walkup	7.36	150.1	1937	SLA	27	9	12	.429	18	46	6	0	0	218	123	127	16	83	0	4		720	8	2.75	4.97	0.55	0.96	6.4	11.5	2.00	.351	7.60	152	5.47	115	13.05	-10.7
6	Jack Knott J. Knott	7.29	192.2	1936	SLA	47	9	17	.346	23	60	9	0	6	272	156	174	15	93	4	16		929	11	2.80	4.34	0.65	0.70	6.5	10.0	1.89	.339	8.13	138	5.16	102	12.71	-1.5
7	Tom Colcolough T. Colcolough	7.23	150.2	1894	PIT	23	8	5	.615	14	29	11	0	0	213	121	147	5	72	5	8		724	7	1.73	4.30	0.40	0.30	4.0	9.9	1.89	.339	8.78	140	5.39	104	12.72	-5.1
8	Jeff Fassero J. Fassero	7.20	156.1	1999	TOT	37	5	14	.263	27	114	0	0	0	208	125	135	35	83	4	2	3	751	9	6.56	4.78	1.37	2.01	15.2	11.1	1.86	.336	7.77	153	6.24	133	11.97	-27.3
9	Jose Lima J. Lima	6.99	168.2	2005	KCR	32	5	16	.238	32	80	1	0	0	219	131	140	31	61	9	0	1	780	5	4.27	3.25	1.31	1.65	10.3	7.8	1.66	.314	7.47	156	5.70	132	11.69	-25.8
10	David Cone D. Cone	6.91	155.0	2000	NYY	30	4	14	.222	29	120	0	0	0	192	119	124	25	82	9	0	3	733	11	6.97	4.76	1.46	1.45	16.4	11.2	1.77	.336	7.20	144	5.44	113	11.15	-10.5
11	Frank Bates F. Bates	6.90	161.2	1899	TOT	22	1	18	.053	19	13	17	0	0	246	124	183	6	110	23	3		839	5	0.72	6.12	0.12	0.33	1.5	13.1	2.20	.349	10.19	179	5.73	149	13.69	-33.8
12	Harry Staley H. Staley	6.81	208.2	1894	BSN	27	12	10	.545	21	32	18	0	1	305	158	204	15	61	5	6		972	4	1.38	2.63	0.52	0.65	3.3	6.3	1.75	.338	8.80	122	5.39	96	13.15	7.1
13	LaTroy Hawkins L. Hawkins	6.66	174.1	1999	MIN	33	10	14	.417	33	103	1	0	0	238	129	136	29	60	1	0	2	803	9	5.32	3.10	1.72	1.50	12.8	7.5	1.71	.343	7.02	133	5.15	109	12.29	-8.1
14	Jose Lima J. Lima	6.65	196.1	2000	HOU	33	7	16	.304	33	124	0	0	0	251	145	152	48	68	2	0	3	895	3	5.68	3.12	1.82	2.20	13.9	7.6	1.62	.311	6.97	138	6.11	129	11.51	-29.2
15	Chubby Dean C. Dean	6.61	159.1	1940	PHA	30	6	13	.316	19	38	8	1	1	220	117	136	21	63	0	8		754	5	2.15	3.56	0.60	1.19	5.0	8.4	1.78	.315	7.68	149	5.26	121	12.43	-16.1
16	Darryl Kile D. Kile	6.61	190.2	1999	COL	32	8	13	.381	32	116	1	0	0	225	140	150	33	109	6	0	5	888	13	5.48	5.15	1.06	1.56	13.1	12.3	1.75	.308	7.08	119	5.97	117	10.62	-16.2
17	Nels Potter N. Potter	6.60	196.1	1939	PHA	41	8	12	.400	25	60	9	0	2	258	144	163	26	88	5	12		922	12	2.75	4.03	0.68	1.19	6.5	9.5	1.76	.312	7.47	143	5.50	124	11.83	-22.9
18	Tony Mullane T. Mullane	6.59	155.2	1894	TOT	25	7	11	.389	19	46	12	0	4	201	114	152	7	100	7	6		756	12	2.66	5.78	0.46	0.40	6.1	13.2	1.93	.326	8.79	121	5.87	108	11.62	-6.3
19	Ernie Wingard E. Wingard	6.56	156.1	1927	SLA	38	2	13	.133	17	28	7	0	0	213	114	132	7	79	2	11		738	8	1.61	4.55	0.35	0.40	3.8	10.7	1.87	.331	7.60	153	4.80	113	12.26	-8.5
20	George Caster G. Caster	6.56	178.1	1940	PHA	36	4	19	.174	24	75	11	0	2	234	130	160	18	69	3	8		835	3	3.79	3.48	1.09	0.91	9.0	8.3	1.70	.322	8.07	148	4.52	104	11.81	-3.5
21	George Keefe G. Keefe	6.52	196.0	1890	BUF	25	6	16	.273	22	55	22	0	0	280	142	229	11	138	5	3		1,014	13	2.53	6.34	0.40	0.51	5.4	13.6	2.13	.334	10.52	157	5.27	128	12.86	-26.7
22	Scott Stratton S. Stratton	6.51	171.1	1894	TOT	23	9	10	.474	18	27	16	0	0	277	124	181	8	55	6	4		832	5	1.42	2.89	0.49	0.42	3.2	6.6	1.94	.365	9.51	121	5.17	96	14.55	5.3
23	Bill Kissinger B. Kissinger	6.51	152.0	1895	TOT	26	5	12	.294	16	34	10	0	0	240	110	156	8	53	8	10		742	3	2.01	3.14	0.64	0.47	4.6	7.1	1.93	.363	9.24	138	5.02	106	14.21	-5.3
24	Ken Schrom K. Schrom	6.50	153.2	1987	CLE	32	6	13	.316	29	61	4	1	0	185	111	126	29	57	3	0	1	695	4	3.57	3.34	1.07	1.70	8.8	8.2	1.57	.286	7.38	144	5.69	128	10.84	-21
25	Mike Sullivan M. Sullivan	6.48	208.1	1894	TOT	33	8	15	.348	23	40	20	0	1	294	150	216	14	121	11	8		1,026	15	1.73	5.23	0.33	0.60	3.9	11.8	1.99	.333	9.33	120	6.21	115	12.70	-18