most (wins minus losses)/gs by a pitcher in a season with 30 gs

Lefty Grove has the most pitcher wins - pitcher losses per start with 30+ starts in a season, with 0.9 in 1931.

Interpreted as:

Most (wins minus losses)/gs by a pitcher in a season with 30 or more gs

	NAME	(W-L)/GS	GS	W	L	SEASON	TM	W%	L%	G	ERA	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	ERA-	FIP	FIP-	H/9	PRAA
1	Lefty Grove L. Grove	0.9	30	31	4	1931	PHA	.886	.114	41	2.06	175	27	4	5	288.2	249	66	84	10	62	1	10		1,160	2	5.46	1.93	2.82	0.31	15.1	5.3	1.08	.262	2.62	47	3.01	70	7.76	40.8
2	Walter Johnson W. Johnson	0.81	36	36	7	1913	WSH	.837	.163	48	1.14	243	29	11	2	346.0	232	44	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
3	Joe Wood J. Wood	0.76	38	34	5	1912	BSA	.872	.128	43	1.91	258	35	10	1	344.0	267	73	104	2	82	12	5		1,328	7	6.75	2.15	3.15	0.05	19.4	6.2	1.01	.272	2.72	58	2.25	71	6.99	35.1
4	Lefty Grove L. Grove	0.72	32	28	5	1930	PHA	.848	.152	50	2.54	209	22	2	9	291.0	273	82	101	8	60	5	17		1,191	2	6.46	1.86	3.48	0.25	17.5	5.0	1.14	.292	3.12	53	3.09	64	8.44	55.6
5	Dizzy Dean D. Dean	0.7	33	30	7	1934	SLN	.811	.189	50	2.66	195	24	7	7	311.2	288	92	110	14	75	6	14		1,291	2	5.63	2.17	2.60	0.40	15.1	5.8	1.16	.274	3.18	64	3.23	77	8.32	32.6
6	Eddie Plank E. Plank	0.67	30	26	6	1912	PHA	.813	.188	37	2.22	110	23	5	2	259.2	234	64	90	1	83	6	7		1,044	5	3.81	2.88	1.33	0.03	10.5	8.0	1.22	.276	3.12	69	3.08	99	8.11	-0.7
7	Jack Chesbro J. Chesbro	0.67	33	28	6	1902	PIT	.824	.176	35	2.17	136	31	8	1	286.1	242	69	81	1	62	21	2		1,139	3	4.27	1.95	2.19	0.03	11.9	5.4	1.06	.262	2.55	78	2.63	90	7.61	9
8	Bill Hoffer B. Hoffer	0.66	38	31	6	1895	BAL	.838	.162	41	3.21	80	32	4	0	314.0	296	112	146	9	124	19	3		1,349	3	2.29	3.55	0.65	0.26	5.9	9.2	1.34	.257	4.18	67	4.81	101	8.48	-1.3
9	Dazzy Vance D. Vance	0.65	34	28	6	1924	BKN	.824	.176	35	2.16	262	30	3	0	308.1	238	74	89	11	77	9	1		1,221	4	7.65	2.25	3.40	0.32	21.5	6.3	1.02	.263	2.60	58	2.64	69	6.95	41.3
10	Mordecai Brown M. Brown	0.65	31	29	9	1908	CHC	.763	.237	44	1.47	123	27	9	5	312.1	214	51	64	1	49	5	12		1,153	6	3.54	1.41	2.51	0.03	10.7	4.2	0.84	.218	1.84	63	1.87	75	6.17	21.5
11	Old Hoss Radbourn O. Hoss Radbourn	0.64	73	59	12	1884	PRO	.831	.169	75	1.38	441	73	11	2	678.2	528	104	216	18	98		2		2,672	34	5.85	1.30	4.50	0.24	16.5	3.7	0.92		2.86	48	2.75	84	7.00	31.9
12	Lefty Gomez L. Gomez	0.64	33	26	5	1934	NYY	.839	.161	38	2.33	158	25	6	2	281.2	223	73	86	12	96	0	5		1,142	3	5.05	3.07	1.65	0.38	13.8	8.4	1.13	.241	2.75	56	3.57	86	7.13	17.7
13	Bullet Joe Bush B. Joe Bush	0.63	30	26	7	1922	NYY	.788	.212	39	3.31	92	20	0	3	255.1	240	94	109	16	85	1	8		1,062	5	3.24	3.00	1.08	0.56	8.7	8.0	1.27	.258	3.84	82	4.11	100	8.46	-0.5
14	Howie Camnitz H. Camnitz	0.63	30	25	6	1909	PIT	.806	.194	41	1.62	133	20	6	3	283.0	207	51	75	1	68	7	11		1,057	2	4.23	2.16	1.96	0.03	12.6	6.4	0.97	.243	2.39	63	2.12	81	6.58	15.9
15	Ron Guidry R. Guidry	0.63	35	25	3	1978	NYY	.893	.107	35	1.74	248	16	9	0	273.2	187	53	61	13	72	1	0	1	1,057	7	8.16	2.37	3.44	0.43	23.5	6.8	0.95	.241	2.01	48	2.18	58	6.15	48.5
16	Eddie Cicotte E. Cicotte	0.63	35	29	7	1919	CWS	.806	.194	40	1.82	110	30	5	1	306.2	256	62	77	5	49	2	5		1,176	1	3.23	1.44	2.24	0.15	9.4	4.2	0.99	.249	2.26	57	2.48	79	7.51	22.5
17	Jim Hughes J. Hughes	0.63	35	28	6	1899	BKN	.824	.176	35	2.68	99	30	3	0	291.2	250	87	121	6	119	14	0		1,213	9	3.05	3.67	0.83	0.19	8.2	9.8	1.27	.250	3.73	69	3.89	100	7.71	0.3
18	Mordecai Brown M. Brown	0.63	32	26	6	1906	CHC	.813	.188	36	1.04	144	27	9	3	277.1	198	32	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
19	Cy Young C. Young	0.63	40	35	10	1895	CLE	.778	.222	47	3.26	121	36	4	0	369.2	363	134	177	10	75	8	7		1,518	6	2.95	1.83	1.61	0.24	8.0	4.9	1.18	.271	4.31	66	3.95	80	8.84	43.3
20	Joe McGinnity J. McGinnity	0.61	44	35	8	1904	NYG	.814	.186	51	1.61	144	38	9	5	408.0	307	73	103	8	86	13	7		1,588	2	3.18	1.90	1.67	0.18	9.1	5.4	0.96	.224	2.27	59	2.70	96	6.77	5.3
21	Cliff Lee C. Lee	0.61	31	22	3	2008	CLE	.880	.120	31	2.54	170	4	2	0	223.1	214	63	68	12	34	5	0	1	891	4	6.85	1.37	5.00	0.48	19.1	3.8	1.11	.301	2.74	59	2.82	67	8.62	35.4
22	Denny McLain D. McLain	0.61	41	31	6	1968	DET	.838	.162	41	1.96	280	28	6	0	336.0	241	73	86	31	63	6	0	2	1,288	3	7.50	1.69	4.44	0.83	21.7	4.9	0.90	.231	2.30	64	2.53	79	6.46	24.8
23	Roger Clemens R. Clemens	0.61	33	24	4	1986	BOS	.857	.143	33	2.48	238	10	1	0	254.0	179	70	77	21	67	4	0	0	997	11	8.43	2.37	3.55	0.74	23.9	6.7	0.97	.237	2.73	58	2.80	69	6.34	36.3
24	Russ Ford R. Ford	0.61	33	26	6	1910	NYH	.813	.188	36	1.65	209	29	8	1	299.2	194	55	69	4	70	8	3		1,112	5	6.28	2.10	2.99	0.12	18.8	6.3	0.88	.231	2.07	63	1.88	69	5.83	28.3
25	Bob Welch B. Welch	0.6	35	27	6	1990	OAK	.818	.182	35	2.95	127	2	2	0	238.0	214	78	90	26	77	5	0	4	979	2	4.80	2.91	1.65	0.98	13.0	7.9	1.22	.253	3.40	79	4.19	110	8.09	-11.1