Andy Pettitte has the most career wins in the postseason, with 19 wins.

Interpreted as:

most MLB playoff wins by a player by pigcher

	NAME	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	H/9
1	Andy Pettitte A. Pettitte	19	11	.633	44	44	3.81	183	0	0	0	276.2	285	117	121	31	76	3	0	4	1,157	4	5.95	2.47	2.41	1.01	15.8	6.6	1.30	.294	3.94	9.27
2	Justin Verlander J. Verlander	17	12	.586	38	37	3.58	244	2	1	0	226.0	179	90	93	32	74	5	0	0	920	8	9.72	2.95	3.30	1.27	26.5	8.0	1.12	.260	3.70	7.13
3	John Smoltz J. Smoltz	15	4	.789	41	27	2.67	199	2	1	4	209.0	172	62	67	17	67	3	11	6	856	6	8.57	2.89	2.97	0.73	23.2	7.8	1.14	.272	2.89	7.41
4	Tom Glavine T. Glavine	14	16	.467	35	35	3.30	143	3	0	0	218.1	191	80	91	21	87	7	0	11	912	3	5.89	3.59	1.64	0.87	15.7	9.5	1.27	.260	3.75	7.87
5	Clayton Kershaw C. Kershaw	13	13	.500	39	32	4.49	213	0	0	1	194.1	165	97	102	30	51	4	2	5	788	11	9.86	2.36	4.18	1.39	27.0	6.5	1.11	.276	4.72	7.64
6	Roger Clemens R. Clemens	12	8	.600	35	34	3.75	173	1	1	0	199.0	173	83	87	17	70	6	1	1	837	10	7.82	3.17	2.47	0.77	20.7	8.4	1.22	.273	3.93	7.82
7	Gerrit Cole G. Cole	11	6	.647	22	22	2.77	156	0	0	0	133.1	100	41	50	19	36	3	0	1	537	1	10.53	2.43	4.33	1.28	29.1	6.7	1.02	.251	3.38	6.75
8	Curt Schilling C. Schilling	11	2	.846	19	19	2.23	120	4	2	0	133.1	104	33	37	12	25	3	0	0	525	1	8.10	1.69	4.80	0.81	22.9	4.8	0.97	.252	2.50	7.02
9	Greg Maddux G. Maddux	11	14	.440	35	30	3.27	125	2	0	1	198.0	195	72	97	14	51	9	2	16	836	4	5.68	2.32	2.45	0.64	15.0	6.1	1.24	.284	4.41	8.86
10	Chris Carpenter C. Carpenter	10	4	.714	18	18	3.00	68	1	1	0	108.0	104	36	43	11	36	6	0	2	461	1	5.67	3.00	1.89	0.92	14.8	7.8	1.30	.274	3.58	8.67
11	CC Sabathia	10	7	.588	26	23	4.28	121	1	0	0	130.1	137	62	67	15	63	8	0	9	586	5	8.36	4.35	1.92	1.04	20.6	10.8	1.53	.322	4.63	9.46
12	David Wells D. Wells	10	5	.667	27	17	3.17	83	1	0	0	125.0	116	44	49	12	25	7	2	2	508	1	5.98	1.80	3.32	0.86	16.3	4.9	1.13	.273	3.53	8.35
13	Dave Stewart D. Stewart	10	6	.625	22	18	2.84	73	3	1	0	133.0	99	42	45	13	48	4	3	1	539	4	4.94	3.25	1.52	0.88	13.5	8.9	1.11	.214	3.05	6.70
14	Whitey Ford W. Ford	10	8	.556	22	22	2.71	94	7	3	0	146.0	132	44	51	8	34	3	0	2	594	4	5.79	2.10	2.76	0.49	15.8	5.7	1.14	.273	3.14	8.14
15	Nathan Eovaldi N. Eovaldi	9	3	.750	17	12	3.05	82	0	0	0	79.2	65	27	28	6	18	1	1	3	325	0	9.26	2.03	4.56	0.68	25.2	5.5	1.04	.271	3.16	7.34
16	Jon Lester J. Lester	9	7	.563	26	22	2.51	133	0	0	0	154.0	117	43	46	15	40	3	2	0	610	4	7.77	2.34	3.33	0.88	21.8	6.6	1.02	.243	2.69	6.84
17	Orlando Hernandez O. Hernandez	9	3	.750	19	14	2.55	107	0	0	0	106.0	77	30	32	10	55	4	0	3	443	1	9.08	4.67	1.95	0.85	24.2	12.4	1.25	.251	2.72	6.54
18	Catfish Hunter C. Hunter	9	6	.600	22	19	3.26	70	4	1	1	132.1	114	48	49	21	35	1	2	6	536	2	4.76	2.38	2.00	1.43	13.1	6.5	1.13	.227	3.33	7.75
19	Julio Urías J. Urías	8	3	.727	23	6	3.68	60	0	0	1	58.2	45	24	25	10	12	0	4	1	232	2	9.20	1.84	5.00	1.53	25.9	5.2	0.97	.233	3.84	6.90
20	Madison Bumgarner M. Bumgarner	8	3	.727	16	14	2.11	87	3	3	1	102.1	74	24	25	8	18	5	1	2	398	0	7.65	1.58	4.83	0.70	21.9	4.5	0.90	.236	2.20	6.51
21	John Lackey J. Lackey	8	6	.571	29	23	3.44	114	0	0	0	144.0	135	55	58	7	47	4	2	6	601	10	7.13	2.94	2.43	0.44	19.0	7.8	1.26	.298	3.63	8.44
22	Mariano Rivera M. Rivera	8	1	.889	96	0	0.70	110	0	0	42	141.0	86	11	13	2	21	3	78	4	527	3	7.02	1.34	5.24	0.13	20.9	4.0	0.76	.215	0.83	5.49
23	David Cone D. Cone	8	3	.727	21	18	3.80	94	1	0	0	111.1	93	47	52	12	58	2	2	1	480	6	7.60	4.69	1.62	0.97	19.6	12.1	1.36	.258	4.20	7.52
24	Orel Hershiser O. Hershiser	8	3	.727	22	18	2.59	97	4	2	1	132.0	103	38	43	8	43	6	2	5	533	6	6.61	2.93	2.26	0.55	18.2	8.1	1.11	.251	2.93	7.02
25	Jim Palmer J. Palmer	8	3	.727	17	15	2.61	90	6	2	0	124.1	101	36	36	10	50	2	1	4	518	6	6.51	3.62	1.80	0.72	17.4	9.7	1.21	.249	2.61	7.31