Albert Pujols has the highest career OPS in the postseason when making 300+ plate appearances, with an OPS of .995.

Interpreted as:

highest ops by a player, postseason min 300 pa

	NAME	OPS	PA	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG
1	Albert Pujols A. Pujols	.995	360	88	304	57	97	18	1	19	54	50	5	46	1	2	174	38	0	1	20	7	.319	.422	.572
2	David Ortiz D. Ortiz	.947	369	85	304	51	88	22	2	17	61	59	2	72	0	1	165	41	0	4	11	4	.289	.404	.543
3	Manny Ramirez M. Ramirez	.937	493	111	410	67	117	19	0	29	78	72	5	91	1	1	223	48	0	6	12	17	.285	.394	.544
4	Reggie Jackson R. Jackson	.885	318	77	281	41	78	14	1	18	48	33	3	70	5	2	148	33	0	1	3	5	.278	.358	.527
5	Freddie Freeman F. Freeman	.884	300	69	259	35	71	15	1	15	37	35	5	57	3	0	133	31	0	1	4	4	.274	.370	.514
6	George Springer G. Springer	.872	338	73	301	49	79	18	0	21	41	34	2	81	4	1	160	39	0	1	1	5	.262	.340	.532
7	Chipper Jones C. Jones	.864	417	93	338	58	97	18	0	13	47	72	1	61	8	3	154	31	1	5	11	10	.287	.409	.456
8	Carlos Correa C. Correa	.860	358	85	323	38	91	19	0	18	63	31	4	84	1	0	164	37	0	0	2	8	.282	.352	.508
9	Corey Seager C. Seager	.858	346	78	299	55	76	17	1	19	48	42	3	79	3	0	152	37	0	2	3	6	.254	.350	.508
10	Bernie Williams B. Williams	.850	545	121	465	83	128	29	0	22	80	71	3	85	8	5	223	51	0	6	11	17	.275	.371	.480
11	Jose Altuve J. Altuve	.841	484	105	436	89	118	21	0	27	56	43	2	75	9	5	220	48	0	3	2	15	.271	.337	.505
12	Derek Jeter D. Jeter	.838	734	158	650	111	200	32	5	20	61	66	5	135	18	5	302	57	9	4	3	14	.308	.374	.465
13	Justin Turner J. Turner	.831	370	87	317	43	86	19	1	13	42	38	13	59	5	0	146	33	0	2	1	6	.271	.370	.461
14	Pete Rose P. Rose	.828	301	67	268	30	86	13	2	5	22	28	2	22	2	5	118	20	1	1	7	3	.321	.388	.440
15	Paul O'Neill P. O'Neill	.828	340	85	299	39	85	17	2	11	39	38	0	41	5	0	139	30	1	2	2	12	.284	.363	.465
16	Alex Rodriguez A. Rodriguez	.822	330	76	278	43	72	16	0	13	41	39	9	77	8	3	127	29	1	3	4	6	.259	.365	.457
17	Alex Bregman A. Bregman	.791	447	102	380	63	91	18	1	19	55	56	9	66	3	1	168	38	0	2	4	11	.239	.349	.442
18	Mookie Betts M. Betts	.774	372	81	323	55	86	25	1	8	39	43	1	56	16	1	137	34	0	5	7	5	.266	.349	.424
19	Jorge Posada J. Posada	.745	492	125	416	53	103	23	1	11	42	70	3	109	3	3	161	35	0	3	9	15	.248	.358	.387
20	Matt Holliday M. Holliday	.723	314	77	290	42	71	10	1	13	37	18	6	62	1	1	122	24	0	0	0	5	.245	.303	.421
21	David Justice D. Justice	.717	471	112	398	55	89	17	2	14	63	64	5	79	3	2	152	33	0	4	7	7	.224	.335	.382
22	Yuli Gurriel Y. Gurriel	.698	380	92	348	35	91	15	1	8	39	28	2	36	5	0	132	24	0	2	5	7	.261	.318	.379
23	Yadier Molina Y. Molina	.682	406	104	373	29	102	19	0	4	36	27	3	44	1	1	133	23	1	2	6	13	.273	.326	.357
24	Tino Martinez T. Martinez	.672	405	99	356	44	83	15	0	9	38	41	6	72	3	2	125	24	0	2	7	1	.233	.321	.351
25	Kenny Lofton K. Lofton	.667	438	95	392	65	97	12	4	7	34	38	2	68	34	6	138	23	3	3	3	4	.247	.315	.352