worst winning percentage by a pitcher with 20 or more starts in a season

Ryne Stanek has the worst win percentage with 20+ starts in a season, at .000 in 2019.

	NAME	W%	GS	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	Ryne Stanek R. Stanek	.000	27	2019	TOT	0	4	63	3.97	89	0	0	1	77.0	61	34	39	11	39	0	12	3	327	5	10.40	4.56	2.28	1.29	27.2	11.9	1.30	.266	4.56	93	4.27	98	7.13	0.7
2	Jack Nabors J. Nabors	.048	30	1916	PHA	1	20	40	3.47	74	11	0	1	212.2	206	82	110	2	95	3	8		871	4	3.13	4.02	0.78	0.08	8.5	10.9	1.42	.293	4.66	123	3.12	111	8.72	-7.3
3	Homer Bailey H. Bailey	.067	20	2018	CIN	1	14	20	6.09	75	1	0	0	106.1	141	72	82	23	33	2	0	9	494	2	6.35	2.79	2.27	1.95	15.2	6.7	1.64	.327	6.94	148	5.54	133	11.93	-15.5
4	Jordan Zimmermann J. Zimmermann	.071	23	2019	DET	1	13	23	6.91	82	0	0	0	112.0	145	86	89	19	25	6	0	2	504	3	6.59	2.01	3.28	1.53	16.3	5.0	1.52	.339	7.15	150	4.77	105	11.65	-2.6
5	Pascual Perez P. Perez	.071	22	1985	ATL	1	13	22	6.14	57	0	0	0	95.1	115	65	72	10	57	1	0	10	453	2	5.38	5.38	1.00	0.94	12.6	12.6	1.80	.320	6.80	161	4.67	123	10.86	-8.6
6	Bob Miller B. Miller	.077	21	1962	NYM	1	12	33	4.89	91	1	0	1	143.2	146	78	98	20	62	6	7	2	646	12	5.70	3.88	1.47	1.25	14.1	9.6	1.45	.270	6.14	119	4.58	115	9.15	-8.7
7	Ross Ohlendorf R. Ohlendorf	.083	21	2010	PIT	1	11	21	4.07	79	0	0	0	108.1	106	49	54	12	44	6	0	2	475	5	6.56	3.66	1.80	1.00	16.6	9.3	1.38	.281	4.49	105	4.44	113	8.81	-6.6
8	Joe Harris J. Harris	.087	24	1906	BSA	2	21	30	3.52	99	20	1	2	235.0	211	92	130	5	67	7	6		942	6	3.79	2.57	1.48	0.19	10.5	7.1	1.18	.270	4.98	131	2.75	106	8.08	-4.3
9	Ryan Rowland-Smith R. Rowland-Smith	.091	20	2010	SEA	1	10	27	6.75	49	0	0	0	109.1	141	82	94	25	44	7	2	2	510	7	4.03	3.62	1.11	2.06	9.6	8.6	1.69	.301	7.74	174	6.55	162	11.61	-31.5
10	Les German L. German	.091	20	1896	TOT	2	20	29	6.43	20	14	0	1	169.1	249	121	180	6	75	5	8		815	4	1.06	3.99	0.27	0.32	2.5	9.2	1.91	.343	9.57	146	4.93	112	13.23	-9.6
11	Jose DeLeon J. DeLeon	.095	25	1985	PIT	2	19	31	4.70	149	1	0	3	162.2	138	85	93	15	89	3	5	3	700	7	8.24	4.92	1.67	0.83	21.3	12.7	1.40	.277	5.15	130	3.74	101	7.64	-0.8
12	Jim Abbott J. Abbott	.100	23	1996	CAL	2	18	27	7.48	58	1	0	0	142.0	171	118	128	23	78	4	2	3	654	13	3.68	4.94	0.74	1.46	8.9	11.9	1.75	.301	8.11	150	6.18	125	10.84	-19
13	Matt Keough M. Keough	.105	28	1979	OAK	2	17	30	5.04	95	7	1	0	176.2	220	99	115	18	78	7	2	2	800	13	4.84	3.97	1.22	0.92	11.9	9.8	1.69	.336	5.86	126	4.41	105	11.21	-4.5
14	Yariel Rodríguez Y. Rodríguez	.111	21	2024	TOR	1	8	21	4.47	85	0	0	0	86.2	74	43	46	11	40	3	0	0	368	0	8.83	4.15	2.13	1.14	23.1	10.9	1.32	.275	4.78	112	4.34	106	7.68	-2.4
15	Art Houtteman A. Houtteman	.111	20	1948	DET	2	16	43	4.66	74	4	0	10	164.1	186	85	101	11	52	2	15		716	3	4.05	2.85	1.42	0.60	10.3	7.3	1.45	.303	5.53	107	3.62	85	10.19	11.3
16	Kaiser Wilhelm K. Wilhelm	.115	28	1905	BSN	3	23	34	4.53	76	23	0	0	242.1	287	122	166	7	75	5	6		1,052	9	2.82	2.79	1.01	0.26	7.2	7.1	1.49	.315	6.17	151	3.26	111	10.66	-8.9
17	Zack Greinke Z. Greinke	.118	27	2023	KCR	2	15	30	5.06	97	0	0	0	142.1	158	80	82	25	23	4	0	0	593	2	6.13	1.45	4.22	1.58	16.4	3.9	1.27	.300	5.19	113	4.74	111	9.99	-7.3
18	Ken Reynolds K. Reynolds	.118	23	1972	PHI	2	15	33	4.26	87	2	0	0	154.1	149	73	76	17	60	1	1	6	652	1	5.07	3.50	1.45	0.99	13.3	9.2	1.35	.271	4.43	120	3.88	113	8.69	-7.5
19	Jim Hughey J. Hughey	.118	34	1899	CLE	4	30	36	5.41	54	32	0	0	283.0	403	170	244	9	88	22	2		1,318	10	1.72	2.80	0.61	0.29	4.1	6.7	1.73	.344	7.76	141	4.14	107	12.82	-9
20	Joe Blanton J. Blanton	.125	20	2013	LAA	2	14	28	6.04	108	0	0	0	132.2	180	89	96	29	34	4	7	4	611	9	7.33	2.31	3.18	1.97	17.7	5.6	1.61	.346	6.51	159	5.12	133	12.21	-19.5
21	Anthony Reyes A. Reyes	.125	20	2007	STL	2	14	22	6.04	74	1	0	0	107.1	108	72	77	16	43	9	1	0	474	1	6.20	3.61	1.72	1.34	15.6	9.1	1.41	.277	6.46	141	5.24	119	9.06	-10.4
22	Don Larsen D. Larsen	.125	28	1954	BAL	3	21	29	4.37	80	12	1	0	201.2	213	98	106	18	89	1	1		892	2	3.57	3.97	0.90	0.80	9.0	10.0	1.50	.277	4.73	125	4.10	117	9.51	-14.7
23	Rick Waits R. Waits	.133	21	1982	CLE	2	13	25	5.40	44	2	0	0	115.0	128	69	74	13	57	1	0	2	510	4	3.44	4.46	0.77	1.02	8.6	11.2	1.61	.291	5.79	130	4.93	119	10.02	-9.9
24	Dory Dean D. Dean	.133	30	1876	CIN	4	26	30	3.73	22	26	0	0	262.2	397	109	268	1	24		1		1,257	17	0.75	0.82	0.92	0.03	1.8	1.9	1.60		9.18	170	2.39	109	13.60	-11.5
25	Walt Dickson W. Dickson	.136	20	1912	BSN	3	19	36	3.86	47	9	1	1	189.0	233	81	123	2	61	3	12		825	4	2.24	2.90	0.77	0.10	5.7	7.4	1.56	.324	5.86	107	3.51	95	11.10	5.5