worst single season era by a starting pitcher with at least 20 wins

Bobo Newsom has the highest ERA by a starting pitcher with 20+ pitcher wins in a season, with an ERA of 5.10 in 1938.

	NAME	ERA	W	SEASON	TM	L	W%	G	GS	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	H/9
1	Bobo Newsom B. Newsom	5.10	20	1938	SLA	16	.556	40	40	223	31	0	0	325.0	328	184	202	30	189	5	0		1,451	3	6.18	5.23	1.18	0.83	15.4	13.0	1.59	.297	5.59	9.08
2	Ray Kremer R. Kremer	4.90	20	1930	PIT	11	.645	38	38	58	18	1	0	275.2	361	150	177	29	63	1	0		1,224	3	1.89	2.06	0.92	0.95	4.7	5.1	1.54	.309	5.78	11.79
3	Vern Kennedy V. Kennedy	4.64	20	1936	CWS	9	.690	34	34	98	20	1	0	273.1	282	141	167	13	146	3	0		1,210	8	3.23	4.81	0.67	0.43	8.1	12.1	1.57	.283	5.50	9.29
4	Rick Helling R. Helling	4.41	20	1998	TEX	7	.741	33	33	164	4	2	0	216.1	209	106	109	27	78	1	0	6	922	10	6.82	3.24	2.10	1.12	17.8	8.5	1.33	.279	4.53	8.69
5	George Earnshaw G. Earnshaw	4.37	20	1930	PHA	11	.645	39	39	178	20	3	0	273.2	278	133	146	19	120	2	0		1,196	9	5.85	3.95	1.48	0.62	14.9	10.0	1.45	.295	4.80	9.14
6	Wes Ferrell W. Ferrell	4.17	20	1936	BSA	15	.571	38	38	104	28	3	0	298.0	326	138	158	11	115	6	0		1,324	3	3.14	3.47	0.90	0.33	7.9	8.7	1.48	.290	4.77	9.85
7	George Uhle G. Uhle	4.16	21	1922	CLE	15	.583	40	40	78	23	5	0	270.1	309	125	142	6	79	13	0		1,192	6	2.60	2.63	0.99	0.20	6.5	6.6	1.44	.298	4.73	10.29
8	Tim Hudson T. Hudson	4.14	20	2000	OAK	6	.769	32	32	169	2	2	0	202.1	169	93	100	24	82	7	0	5	847	7	7.52	3.65	2.06	1.07	20.0	9.7	1.24	.257	4.45	7.52
9	David Wells D. Wells	4.11	20	2000	TOR	8	.714	35	35	166	9	1	0	229.2	266	105	115	23	31	8	0	0	972	9	6.51	1.21	5.35	0.90	17.1	3.2	1.29	.327	4.51	10.42
10	Lew Burdette L. Burdette	4.09	21	1959	MIL	15	.583	39	39	104	20	4	0	288.0	310	131	144	38	37	1	0	3	1,186	2	3.25	1.16	2.81	1.19	8.8	3.1	1.20	.270	4.50	9.69
11	Lefty Gomez L. Gomez	4.09	23	1932	NYY	5	.821	31	31	170	21	1	0	257.1	259	117	131	21	96	2	0		1,105	0	5.95	3.36	1.77	0.73	15.4	8.7	1.38	.292	4.58	9.06
12	Jim Merritt J. Merritt	4.08	20	1970	CIN	12	.625	35	35	136	12	1	0	234.0	248	106	114	21	53	1	0	12	984	4	5.23	2.04	2.57	0.81	13.8	5.4	1.29	.294	4.38	9.54
13	Jack Morris J. Morris	4.04	21	1992	TOR	6	.778	34	34	132	6	1	0	240.2	222	108	114	18	80	10	0	2	1,005	9	4.94	2.99	1.65	0.67	13.1	8.0	1.25	.267	4.26	8.30
14	Andy Pettitte A. Pettitte	4.02	21	2003	NYY	8	.724	33	33	180	1	0	0	208.1	227	93	109	21	50	1	0	3	896	5	7.78	2.16	3.60	0.91	20.1	5.6	1.33	.320	4.71	9.81
15	Vic Raschi V. Raschi	4.01	21	1950	NYY	8	.724	32	32	155	17	2	0	255.2	232	114	120	19	114	3	0		1,082	6	5.46	4.01	1.36	0.67	14.3	10.5	1.35	.269	4.22	8.17
16	Paul Splittorff P. Splittorff	3.98	20	1973	KCR	11	.645	38	38	110	12	3	0	262.0	279	116	135	19	78	5	0	7	1,120	9	3.78	2.68	1.41	0.65	9.8	7.0	1.36	.286	4.64	9.58
17	Andy Pettitte A. Pettitte	3.92	20	1996	NYY	8	.714	34	34	160	2	0	0	218.0	226	95	105	23	72	3	0	2	919	6	6.61	2.97	2.22	0.95	17.4	7.8	1.37	.307	4.33	9.33
18	Denny McLain D. McLain	3.92	20	1966	DET	14	.588	38	38	192	14	4	0	264.1	205	115	120	42	104	3	0	3	1,080	6	6.54	3.54	1.85	1.43	17.8	9.6	1.17	.221	4.09	6.98
19	Johnny Sain J. Sain	3.91	20	1950	BSN	13	.606	37	37	96	25	3	0	278.1	294	121	139	34	70	2	0		1,181	4	3.10	2.26	1.37	1.10	8.1	5.9	1.31	.266	4.49	9.51
20	Darryl Kile D. Kile	3.91	20	2000	STL	9	.690	34	34	192	5	1	0	232.1	215	101	109	33	58	13	0	1	960	8	7.44	2.25	3.31	1.28	20.0	6.0	1.18	.274	4.22	8.33
21	Lefty Williams L. Williams	3.91	21	1920	CWS	14	.600	38	38	130	25	0	0	297.0	301	129	147	15	89	12	0		1,250	4	3.94	2.70	1.46	0.45	10.4	7.1	1.31	.285	4.45	9.12
22	Bill Gullickson B. Gullickson	3.90	20	1991	DET	9	.690	35	35	91	4	0	0	226.1	256	98	109	22	44	4	0	13	954	4	3.62	1.75	2.07	0.87	9.5	4.6	1.33	.295	4.33	10.18
23	Brad Radke B. Radke	3.87	20	1997	MIN	10	.667	35	35	174	4	1	0	239.2	238	103	114	28	48	3	0	1	989	1	6.53	1.80	3.63	1.05	17.6	4.9	1.19	.285	4.28	8.94
24	Red Ruffing R. Ruffing	3.85	20	1936	NYY	12	.625	33	33	102	25	3	0	271.0	274	116	133	23	90	3	0		1,151	7	3.39	2.99	1.13	0.76	8.9	7.8	1.34	.269	4.42	9.10
25	Ted Lyons T. Lyons	3.83	21	1930	CWS	14	.600	36	36	68	29	1	0	291.1	326	124	158	12	56	2	0		1,236	2	2.10	1.73	1.21	0.37	5.5	4.5	1.31	.286	4.88	10.07