Eric Gagne has the worst win percentage by a Cy Young winner in a season, at .400 in 2003.

Interpreted as:

worst w% in a cy young award in a regular season by a player winner

	NAME	W%	CY	SEASON	TM	W	L	G	GS	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	Eric Gagne E. Gagne	.400	1	2003	LAD	2	3	77	0	1.20	137	0	0	55	82.1	37	11	12	2	20	3	67	2	306	2	14.98	2.19	6.85	0.22	44.8	6.5	0.69	.243	1.31	30	0.85	20	4.04	31.8
2	Paul Skenes P. Skenes	.500	1	2025	PIT	10	10	32	32	1.97	216	1	0	0	187.2	136	41	45	11	42	6	0	0	733	2	10.36	2.01	5.14	0.53	29.5	5.7	0.95	.273	2.16	46	2.36	57	6.52	37
3	Bruce Sutter B. Sutter	.500	1	1979	CHC	6	6	62	0	2.22	110	0	0	37	101.1	67	25	29	3	32	0	56	5	403	9	9.77	2.84	3.44	0.27	27.3	7.9	0.98	.248	2.58	54	1.88	48	5.95	22.5
4	Felix Hernandez F. Hernandez	.520	1	2010	SEA	13	12	34	34	2.27	232	6	1	0	249.2	194	63	80	17	70	8	0	1	1,001	14	8.36	2.52	3.31	0.61	23.2	7.0	1.06	.263	2.88	58	3.04	75	6.99	28.4
5	Jacob deGrom J. deGrom	.526	1	2018	NYM	10	9	32	32	1.70	269	1	0	0	217.0	152	41	48	10	46	5	0	3	835	2	11.16	1.91	5.85	0.41	32.2	5.5	0.91	.281	1.99	44	1.98	50	6.30	49
6	Trevor Bauer T. Bauer	.556	1	2020	CIN	5	4	11	11	1.73	100	2	2	0	73.0	41	14	17	9	17	3	0	1	278	3	12.33	2.10	5.88	1.11	36.0	6.1	0.79	.215	2.10	36	2.87	61	5.05	14.1
7	Mike Marshall M. Marshall	.556	1	1974	LAD	15	12	106	0	2.42	143	0	0	21	208.1	191	56	66	9	56	1	83	1	857	5	6.18	2.42	2.55	0.39	16.7	6.5	1.19	.281	2.85	70	2.58	71	8.25	23.9
8	Mark Davis M. Davis	.571	1	1989	SDP	4	3	70	0	1.85	92	0	0	44	92.2	66	19	21	6	31	2	65	1	370	8	8.94	3.01	2.97	0.58	24.9	8.4	1.05	.251	2.04	53	2.68	74	6.41	9.8
9	Jacob deGrom J. deGrom	.579	1	2019	NYM	11	8	32	32	2.43	255	0	0	0	204.0	154	55	59	19	44	7	0	1	804	2	11.25	1.94	5.80	0.84	31.7	5.5	0.97	.282	2.60	60	2.66	62	6.79	37.8
10	Gaylord Perry G. Perry	.600	1	1972	CLE	24	16	41	40	1.92	234	29	5	1	342.2	253	73	79	17	82	12	1	16	1,345	11	6.15	2.15	2.85	0.45	17.4	6.1	0.98	.236	2.07	60	2.49	74	6.64	31.9
11	Blake Snell B. Snell	.609	1	2023	SDP	14	9	32	32	2.25	234	0	0	0	180.0	115	45	47	15	99	3	0	0	742	13	11.70	4.95	2.36	0.75	31.5	13.3	1.19	.256	2.35	54	3.43	79	5.75	18
12	Sandy Alcantara S. Alcantara	.609	1	2022	MIA	14	9	32	32	2.28	207	6	1	0	228.2	174	58	67	16	50	9	0	1	886	3	8.15	1.97	4.14	0.63	23.4	5.6	0.98	.262	2.64	56	2.98	76	6.85	23.8
13	Randy Jones R. Jones	.611	1	1976	SDP	22	14	40	40	2.74	93	25	5	0	315.1	274	96	109	15	50	4	0	9	1,251	0	2.65	1.43	1.86	0.43	7.4	4.0	1.03	.238	3.11	83	3.17	94	7.82	7.1
14	Steve Bedrosian S. Bedrosian	.625	1	1987	PHI	5	3	65	0	2.83	74	0	0	40	89.0	79	28	31	11	28	1	56	5	366	3	7.48	2.83	2.64	1.11	20.2	7.7	1.20	.270	3.13	67	3.78	92	7.99	3.4
15	Jim Palmer J. Palmer	.629	1	1976	BAL	22	13	40	40	2.51	159	23	6	0	315.0	255	88	101	20	84	8	0	5	1,256	5	4.54	2.40	1.89	0.57	12.7	6.7	1.08	.239	2.89	77	3.32	97	7.29	3.3
16	Clayton Kershaw C. Kershaw	.640	1	2013	LAD	16	9	33	33	1.83	232	3	2	0	236.0	164	48	55	11	52	3	0	2	908	12	8.85	1.98	4.46	0.42	25.6	5.7	0.92	.251	2.10	51	2.38	64	6.25	35.4
17	Roger Clemens R. Clemens	.643	1	1991	BOS	18	10	35	35	2.62	241	13	4	0	271.1	219	79	93	15	65	5	0	12	1,077	6	7.99	2.16	3.71	0.50	22.4	6.0	1.05	.272	3.08	61	2.57	63	7.26	44.5
18	Mike Scott M. Scott	.643	1	1986	HOU	18	10	37	37	2.22	306	7	5	0	275.1	182	68	73	17	72	2	0	6	1,065	3	10.00	2.35	4.25	0.56	28.7	6.8	0.92	.247	2.39	63	2.15	61	5.95	43.6
19	Greg Maddux G. Maddux	.645	1	1992	CHC	20	11	35	35	2.18	199	9	4	0	268.0	201	65	68	7	70	14	0	7	1,061	5	6.68	2.35	2.84	0.24	18.8	6.6	1.01	.252	2.28	61	2.57	71	6.75	30.5
20	Tom Glavine T. Glavine	.645	1	1991	ATL	20	11	34	34	2.55	192	9	1	0	246.2	201	70	83	17	69	2	0	6	989	10	7.01	2.52	2.78	0.62	19.4	7.0	1.09	.260	3.03	67	3.05	80	7.33	20.8
21	Fergie Jenkins F. Jenkins	.649	1	1971	CHC	24	13	39	39	2.77	263	30	3	0	325.0	304	100	114	29	37	5	0	6	1,299	3	7.28	1.02	7.11	0.80	20.2	2.8	1.05	.285	3.16	73	2.38	64	8.42	45.3
22	Robbie Ray R. Ray	.650	1	2021	TOR	13	7	32	32	2.84	248	0	0	0	193.1	150	61	62	33	52	4	0	0	773	5	11.54	2.42	4.77	1.54	32.1	6.7	1.04	.268	2.89	63	3.68	87	6.98	11.8
23	Fernando Valenzuela F. Valenzuela	.650	1	1981	LAD	13	7	25	25	2.48	180	11	8	0	192.1	140	53	55	11	61	1	0	4	758	4	8.42	2.85	2.95	0.51	23.7	8.0	1.05	.255	2.57	73	2.44	72	6.55	20.4
24	Randy Johnson R. Johnson	.654	1	1999	ARI	17	9	35	35	2.48	364	12	2	0	271.2	207	75	86	30	70	9	0	3	1,079	4	12.06	2.32	5.20	0.99	33.7	6.5	1.02	.292	2.85	53	2.75	59	6.86	57.2
25	Tom Seaver T. Seaver	.655	1	1973	NYM	19	10	36	36	2.08	251	18	3	0	290.0	219	67	74	23	64	4	0	5	1,147	5	7.79	1.99	3.92	0.71	21.9	5.6	0.98	.243	2.30	59	2.56	72	6.80	32.9