Andy Pettitte has the most career quality starts in the postseason, with 28.

Interpreted as:

most quality starts by a player in playoffs

	NAME	QS	G	W	L	W%	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	28	44	19	11	.633	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	Tom Glavine T. Glavine	24	35	14	16	.467	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
3	John Smoltz J. Smoltz	22	41	15	4	.789	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	Greg Maddux G. Maddux	21	35	11	14	.440	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
5	Justin Verlander J. Verlander	18	38	17	12	.586	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
6	Roger Clemens R. Clemens	18	35	12	8	.600	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	Clayton Kershaw C. Kershaw	16	41	13	13	.500	32	4.62	213	0	0	1	196.2	171	101	107	32	54	4	2	6	803	11	9.75	2.47	3.94	1.46	26.5	6.7	1.14	.278	4.90	7.83
8	Jon Lester J. Lester	15	26	9	7	.563	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
9	Curt Schilling C. Schilling	15	19	11	2	.846	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
10	Dave Stewart D. Stewart	15	22	10	6	.625	18	2.77	73	3	1	0	133.0	99	41	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
11	Whitey Ford W. Ford	15	22	10	8	.556	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
12	Gerrit Cole G. Cole	13	22	11	6	.647	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
13	Mike Mussina M. Mussina	13	23	7	8	.467	21	3.42	145	0	0	0	139.2	121	53	56	19	33	3	0	7	571	2	9.34	2.13	4.39	1.22	25.4	5.8	1.10	.275	3.61	7.80
14	Orel Hershiser O. Hershiser	13	22	8	3	.727	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
15	Catfish Hunter C. Hunter	13	22	9	6	.600	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
16	David Wells D. Wells	12	27	10	5	.667	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
17	Max Scherzer M. Scherzer	11	32	8	8	.500	27	3.82	179	0	0	1	153.0	117	65	68	23	61	9	1	4	634	8	10.53	3.59	2.93	1.35	28.2	9.6	1.16	.260	4.00	6.88
18	Cole Hamels C. Hamels	11	17	7	6	.538	16	3.41	93	1	1	0	100.1	83	38	45	12	27	2	0	2	411	1	8.34	2.42	3.44	1.08	22.6	6.6	1.10	.256	4.04	7.45
19	Chris Carpenter C. Carpenter	11	18	10	4	.714	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
20	CC Sabathia	11	26	10	7	.588	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
21	Randy Johnson R. Johnson	11	19	7	9	.438	16	3.50	132	3	2	0	121.0	106	47	51	15	32	0	2	2	493	0	9.82	2.38	4.13	1.12	26.8	6.5	1.14	.290	3.79	7.88
22	Jim Palmer J. Palmer	11	17	8	3	.727	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
23	Madison Bumgarner M. Bumgarner	10	16	8	3	.727	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
24	John Lackey J. Lackey	10	29	8	6	.571	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
25	Christy Mathewson C. Mathewson	10	11	5	5	.500	11	0.97	48	10	4	0	101.2	75	11	22	1	10	1	0	3	391	1	4.25	0.89	4.80	0.09	12.3	2.6	0.84	.224	1.95	6.64