which pitcher has the most 15 or more win seasons

Cy Young and Greg Maddux played 18 years.

	NAME	SEAS	W	L	W%	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	Cy Young C. Young	18	475	269	.638	811	727	2.56	2,511	679	73	15	6631.0	6,373	1,889	2,806	123	1,107	137	79		26,672	131	3.41	1.50	2.27	0.17	9.4	4.2	1.13	.274	3.81	70	2.88	78	8.65	582.2
2	Walter Johnson W. Johnson	16	372	215	.634	673	558	2.11	2,988	451	93	29	5000.0	4,124	1,170	1,542	83	1,153	165	108		19,726	119	5.38	2.08	2.59	0.15	15.1	5.8	1.06	.263	2.78	64	2.45	74	7.42	432.7
3	Christy Mathewson C. Mathewson	13	347	150	.698	555	487	2.03	2,252	388	69	28	4209.2	3,663	950	1,338	72	723	44	62		16,547	95	4.81	1.55	3.11	0.15	13.6	4.4	1.04	.267	2.86	70	2.19	73	7.83	362.1
4	Pud Galvin P. Galvin	12	339	283	.545	647	632	2.81	1,708	596	56	1	5536.1	5,871	1,729	3,025	114	641	42	17		23,346	210	2.78	1.04	2.66	0.19	7.3	2.7	1.18	.276	4.92	94	2.94	95	9.54	78.9
5	Grover Alexander G. Alexander	15	338	181	.651	611	532	2.46	2,064	398	88	30	4640.2	4,286	1,267	1,591	133	863	65	69		18,601	35	4.00	1.67	2.39	0.26	11.1	4.6	1.11	.268	3.09	71	2.77	80	8.31	339.8
6	Kid Nichols K. Nichols	12	337	180	.652	564	510	2.93	1,761	486	43	17	4634.2	4,504	1,507	2,254	143	1,141	112	52		19,284	153	3.42	2.22	1.54	0.28	9.1	5.9	1.22	.270	4.38	71	3.47	83	8.75	382.3
7	Warren Spahn W. Spahn	16	328	192	.631	608	557	2.96	2,158	342	57	20	4441.0	4,021	1,461	1,632	360	1,206	30	41	54	18,159	64	4.37	2.44	1.79	0.73	11.9	6.6	1.18	.254	3.31	80	3.42	93	8.15	131.3
8	Tim Keefe T. Keefe	11	321	201	.615	547	543	2.55	2,405	512	39	1	4633.1	4,016	1,311	2,200	69	1,080	62	5		19,107	228	4.67	2.10	2.23	0.13	12.6	5.7	1.10	.255	4.27	77	2.87	87	7.80	228.6
9	Greg Maddux G. Maddux	18	312	170	.647	606	606	2.89	2,912	103	34	0	4204.2	3,837	1,352	1,541	269	823	113	0	150	17,006	49	6.23	1.76	3.54	0.58	17.1	4.8	1.11	.277	3.30	70	3.11	75	8.21	495.8
10	John Clarkson J. Clarkson	9	309	163	.655	492	484	2.76	1,845	458	36	5	4243.2	3,979	1,303	2,180	143	1,118	80	8		17,888	164	3.91	2.37	1.65	0.30	10.3	6.3	1.20	.261	4.62	75	3.30	88	8.44	272
11	Eddie Plank E. Plank	15	307	172	.641	569	487	2.38	2,085	381	64	21	4120.0	3,651	1,089	1,456	39	988	179	68		16,341	80	4.55	2.16	2.11	0.09	12.8	6.0	1.13	.277	3.18	81	2.48	86	7.98	184.4
12	Old Hoss Radbourn O. Hoss Radbourn	9	291	165	.638	477	454	2.58	1,712	441	32	3	4102.1	3,905	1,178	2,014	97	768	33	22		17,103	198	3.76	1.68	2.23	0.21	10.0	4.5	1.14	.263	4.42	79	3.11	94	8.57	60.7
13	Mickey Welch M. Welch	10	288	185	.609	509	500	2.59	1,750	481	36	3	4356.0	4,066	1,255	2,190	92	1,134	41	10		18,258	250	3.62	2.34	1.54	0.19	9.6	6.2	1.19	.261	4.52	84	3.23	101	8.40	-11.4
14	Tony Mullane T. Mullane	9	253	186	.576	467	435	2.94	1,547	413	30	5	3902.2	3,546	1,274	2,095	77	1,106	107	33		16,581	287	3.57	2.55	1.40	0.18	9.3	6.7	1.19	.253	4.83	84	3.41	98	8.18	35.3
15	Gus Weyhing G. Weyhing	10	248	201	.552	486	457	3.72	1,580	415	27	4	3949.0	4,039	1,632	2,419	102	1,423	258	28		17,366	231	3.60	3.24	1.11	0.23	9.1	8.2	1.38	.281	5.51	93	3.73	95	9.21	79.7
16	Jim McCormick J. McCormick	8	247	183	.574	442	435	2.30	1,591	418	32	1	3836.1	3,587	979	1,831	70	650		7		15,795	140	3.73	1.52	2.45	0.16	10.1	4.1	1.10		4.30	84	2.78	99	8.42	-13.7
17	Gaylord Perry G. Perry	13	243	176	.580	491	485	2.82	2,604	263	48	3	3837.0	3,337	1,202	1,396	263	965	71	5	111	15,513	100	6.11	2.26	2.70	0.62	16.8	6.2	1.12	.265	3.27	79	2.88	82	7.83	269.9
18	Tom Seaver T. Seaver	13	241	133	.644	457	449	2.65	2,716	188	47	1	3423.0	2,784	1,006	1,115	264	927	51	6	75	13,749	84	7.14	2.44	2.93	0.69	19.8	6.7	1.08	.257	2.93	73	2.84	80	7.32	267.7
19	Lefty Grove L. Grove	11	241	91	.726	437	331	2.75	1,698	237	32	46	2925.1	2,783	895	1,071	104	779	26	92		12,180	29	5.22	2.40	2.18	0.32	13.9	6.4	1.22	.280	3.30	61	3.21	72	8.56	398.4
20	Joe McGinnity J. McGinnity	9	235	135	.635	428	361	2.68	1,013	307	27	19	3255.1	3,084	969	1,363	44	775	172	59		13,370	27	2.80	2.14	1.31	0.12	7.6	5.8	1.19	.267	3.77	84	3.06	94	8.53	74.8
21	Steve Carlton S. Carlton	12	234	134	.636	438	437	2.91	2,738	186	41	0	3319.2	2,839	1,075	1,218	251	1,091	36	0	92	13,585	106	7.42	2.96	2.51	0.68	20.2	8.0	1.18	.273	3.30	79	2.96	82	7.70	242.8
22	Amos Rusie A. Rusie	8	234	163	.589	427	403	2.89	1,835	372	29	5	3531.2	3,100	1,134	1,862	62	1,588	103	24		15,168	142	4.68	4.05	1.16	0.16	12.1	10.5	1.33	.262	4.75	74	3.67	91	7.90	126.9
23	Roger Clemens R. Clemens	12	232	92	.716	403	403	2.78	2,857	96	39	0	2944.1	2,420	909	1,015	188	851	83	0	41	11,926	77	8.73	2.60	3.36	0.57	24.0	7.1	1.11	.281	3.10	64	2.74	65	7.40	475.5
24	Jim Palmer J. Palmer	12	231	114	.670	432	422	2.69	1,890	192	50	3	3251.0	2,695	970	1,063	240	1,041	31	4	30	13,164	68	5.23	2.88	1.82	0.66	14.4	7.9	1.15	.246	2.94	75	3.37	92	7.46	110.3
25	Phil Niekro P. Niekro	13	226	178	.559	510	486	3.23	2,365	189	32	6	3635.2	3,344	1,306	1,514	316	1,174	81	18	59	15,160	134	5.85	2.91	2.01	0.78	15.6	7.7	1.24	.270	3.75	83	3.48	90	8.28	149