Greg Maddux and Cy Young were tied for playing the most seasons with 15+ pitcher wins, with 18 seasons.

Interpreted as:

MLB pitcher most seasons with 15 or more wins

	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	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
2	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
3	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
4	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
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	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
7	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
8	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
9	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
10	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
11	Justin Verlander J. Verlander	12	214	94	.695	392	392	3.08	2,691	24	8	0	2593.0	2,116	886	955	269	680	82	0	17	10,465	78	9.34	2.36	3.96	0.93	25.7	6.5	1.08	.274	3.31	72	3.28	77	7.34	279.1
12	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
13	Jack Morris J. Morris	12	213	141	.602	415	415	3.69	1,987	144	26	0	3010.0	2,728	1,235	1,355	308	1,049	44	0	76	12,583	159	5.94	3.14	1.89	0.92	15.8	8.3	1.25	.263	4.05	91	3.86	93	8.16	98.1
14	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
15	Don Sutton D. Sutton	12	204	135	.602	429	427	3.14	2,086	123	42	1	3067.0	2,672	1,071	1,186	269	793	48	2	47	12,531	76	6.12	2.33	2.63	0.79	16.6	6.3	1.13	.257	3.48	89	3.18	89	7.84	118.9
16	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
17	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
18	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
19	Randy Johnson R. Johnson	11	207	85	.709	371	368	2.93	3,312	72	27	1	2633.1	2,059	858	966	253	766	124	2	16	10,626	53	11.32	2.62	4.32	0.86	31.2	7.2	1.07	.293	3.30	65	2.81	63	7.04	490.1
20	Mike Mussina M. Mussina	11	192	90	.681	352	352	3.45	1,894	39	16	0	2367.0	2,230	908	980	240	511	36	0	21	9,610	42	7.20	1.94	3.71	0.91	19.7	5.3	1.16	.287	3.73	76	3.47	77	8.48	276.7
21	Red Ruffing R. Ruffing	11	196	102	.658	352	323	3.54	1,295	216	33	6	2615.2	2,492	1,028	1,190	180	895	24	24		11,070	26	4.46	3.08	1.45	0.62	11.7	8.1	1.29	.266	4.09	82	4.01	95	8.57	57.4
22	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
23	Burleigh Grimes B. Grimes	11	218	127	.632	412	362	3.30	1,134	244	30	12	3009.1	3,141	1,103	1,386	109	852	71	43		12,802	59	3.39	2.55	1.33	0.33	8.9	6.7	1.33	.285	4.15	85	3.60	92	9.39	103
24	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
25	Tom Glavine T. Glavine	10	183	82	.691	339	339	3.07	1,432	35	16	0	2257.1	2,087	769	861	166	756	33	0	60	9,371	34	5.71	3.01	1.89	0.66	15.3	8.1	1.26	.275	3.43	74	3.76	89	8.32	111.8