Christy Mathewson has the most career complete games in the postseason, with 10 complete games.

Interpreted as:

most postseason complete games by a player

	NAME	CG	G	W	L	W%	GS	ERA	SO	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	Christy Mathewson C. Mathewson	10	11	5	5	.500	11	1.06	48	4	0	101.2	76	12	22	1	10	1	0	3	391	1	4.25	0.89	4.80	0.09	12.3	2.6	0.85	.227	1.95	6.73
2	Chief Bender C. Bender	9	10	6	4	.600	10	2.44	59	1	0	85.0	64	23	28	1	21	2	0	0	331	1	6.25	2.22	2.81	0.11	17.8	6.3	1.00	.254	2.96	6.78
3	Bob Gibson B. Gibson	8	9	7	2	.778	9	1.89	92	2	0	81.0	55	17	19	6	17	2	0	3	312	2	10.22	1.89	5.41	0.67	29.5	5.4	0.89	.251	2.11	6.11
4	Red Ruffing R. Ruffing	8	10	7	2	.778	10	2.63	61	0	0	85.2	74	25	32	4	27	0	0	2	352	0	6.41	2.84	2.26	0.42	17.3	7.7	1.18	.269	3.36	7.77
5	Whitey Ford W. Ford	7	22	10	8	.556	22	2.71	94	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
6	Dave McNally D. McNally	6	14	7	4	.636	12	2.49	65	2	0	90.1	65	25	30	12	34	1	2	2	364	5	6.48	3.39	1.91	1.20	17.9	9.3	1.10	.210	2.99	6.48
7	Jim Palmer J. Palmer	6	17	8	3	.727	15	2.61	90	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
8	Waite Hoyt W. Hoyt	6	12	6	4	.600	11	1.83	49	1	0	83.2	81	17	28	2	22	1	1	0	345	0	5.27	2.37	2.23	0.22	14.2	6.4	1.23	.292	3.01	8.71
9	Art Nehf A. Nehf	6	12	4	4	.500	9	2.16	28	2	0	79.0	50	19	23	2	32	1	1	1	310	2	3.19	3.65	0.88	0.23	9.0	10.3	1.04	.194	2.62	5.70
10	George Mullin G. Mullin	6	7	3	3	.500	6	1.86	36	1	0	58.0	46	12	22	1	15	3	1	0	236	0	5.59	2.33	2.40	0.16	15.3	6.4	1.05	.249	3.41	7.14
11	Eddie Plank E. Plank	6	7	2	5	.286	6	1.32	32	0	0	54.2	36	8	11	0	11	4	1	1	215	1	5.27	1.81	2.91	0.00	14.9	5.1	0.86	.214	1.81	5.93
12	Jack Morris J. Morris	5	13	7	4	.636	13	3.80	64	1	0	92.1	83	39	39	9	32	0	0	3	381	8	6.24	3.12	2.00	0.88	16.8	8.4	1.25	.268	3.80	8.09
13	Allie Reynolds A. Reynolds	5	15	7	2	.778	9	2.79	62	2	4	77.1	61	24	25	8	32	1	5	1	309	1	7.22	3.72	1.94	0.93	20.1	10.4	1.20	.257	2.91	7.10
14	George Earnshaw G. Earnshaw	5	8	4	3	.571	8	1.58	56	1	0	62.2	39	11	14	2	17	0	0	1	245	1	8.04	2.44	3.29	0.29	22.9	6.9	0.89	.218	2.01	5.60
15	Walter Johnson W. Johnson	5	6	3	3	.500	5	2.16	35	1	0	50.0	56	12	20	4	15	3	1	3	212	1	6.30	2.70	2.33	0.72	16.5	7.1	1.42	.335	3.60	10.08
16	Carl Mays C. Mays	5	8	3	4	.429	7	2.20	17	1	1	57.1	47	14	16	0	8	3	1	1	221	0	2.67	1.26	2.13	0.00	7.7	3.6	0.96	.244	2.51	7.38
17	Bullet Joe Bush B. Joe Bush	5	9	2	5	.286	6	2.67	18	0	1	60.2	49	18	20	2	20	1	3	2	237	0	2.67	2.97	0.90	0.30	7.6	8.4	1.14	.240	2.97	7.27
18	Bill Donovan B. Donovan	5	6	1	4	.200	6	2.88	33	0	0	50.0	41	16	21	1	17	4	0	0	204	1	5.94	3.06	1.94	0.18	16.2	8.3	1.16	.268	3.78	7.38
19	Mordecai Brown M. Brown	5	9	5	4	.556	7	2.81	35	3	0	57.2	50	18	26	0	13	1	2	0	236	2	5.46	2.03	2.69	0.00	14.8	5.5	1.09	.267	4.06	7.80
20	Deacon Phillippe D. Phillippe	5	7	3	2	.600	5	2.70	24	0	0	50.0	40	15	19	0	4	1	2	0	201	1	4.32	0.72	6.00	0.00	11.9	2.0	0.88	.233	3.42	7.20
21	Curt Schilling C. Schilling	4	19	11	2	.846	19	2.23	120	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
22	Orel Hershiser O. Hershiser	4	22	8	3	.727	18	2.59	97	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
23	Catfish Hunter C. Hunter	4	22	9	6	.600	19	3.26	70	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
24	Mike Cuellar M. Cuellar	4	12	4	4	.500	12	2.85	56	0	0	85.1	66	27	32	7	31	0	0	3	349	1	5.91	3.27	1.81	0.74	16.0	8.9	1.14	.231	3.38	6.96
25	Sandy Koufax S. Koufax	4	8	4	3	.571	7	0.95	61	2	0	57.0	36	6	10	2	11	0	0	1	213	0	9.63	1.74	5.55	0.32	28.6	5.2	0.82	.245	1.58	5.68