Jim Leyritz has the most career home runs per at-bat in the postseason with 50+ at-bats, with 0.13.

Interpreted as:

most hr/ab by a player postseason, min 50 ab

	NAME	HR/AB	AB	HR	G	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Jim Leyritz J. Leyritz	0.13	61	8	28	8	13	0	0	20	7	3	16	1	0	72	37	8	0	1	1	0	.213	.319	.607	.926
2	Adolis García A. García	0.13	62	8	15	11	20	1	0	22	3	3	18	2	0	68	45	9	0	0	0	0	.323	.382	.726	1.108
3	Juan Gonzalez J. Gonzalez	0.13	62	8	15	11	18	4	0	15	4	0	15	0	0	66	46	12	0	0	1	2	.290	.333	.742	1.075
4	Giancarlo Stanton G. Stanton	0.12	151	18	41	25	40	6	0	40	17	0	43	2	0	172	100	24	0	4	1	4	.265	.331	.662	.994
5	Babe Ruth B. Ruth	0.12	129	15	41	37	42	5	2	33	33	2	30	4	3	167	96	22	2		2	3	.326	.470	.744	1.214
6	Troy Glaus T. Glaus	0.12	78	9	24	18	25	5	1	16	9	1	20	0	0	88	59	15	0	0	2	1	.321	.398	.756	1.154
7	Bob Robertson B. Robertson	0.11	53	6	21	10	15	2	0	12	6	0	10	0	0	59	35	8	0	0	0	0	.283	.356	.660	1.016
8	Gary Matthews G. Matthews	0.11	65	7	19	12	21	0	1	15	10	0	9	2	1	75	44	8	0	0	2	3	.323	.413	.677	1.090
9	Ken Caminiti K. Caminiti	0.1	79	8	23	12	21	1	0	16	12	0	21	0	1	92	46	9	0	1	3	4	.266	.359	.582	.941
10	Craig Monroe C. Monroe	0.1	50	5	13	11	12	4	0	9	4	0	12	0	0	55	31	9	0	1	0	0	.240	.291	.620	.911
11	Albert Belle A. Belle	0.1	61	6	18	10	14	2	0	14	17	1	15	1	1	79	34	8	0	0	5	0	.230	.405	.557	.962
12	Cody Ross C. Ross	0.1	51	5	15	11	15	5	0	10	7	1	11	0	0	59	35	10	0	0	0	1	.294	.390	.686	1.076
13	Randy Arozarena R. Arozarena	0.1	113	11	33	23	38	5	1	17	13	2	33	3	2	128	78	17	0	0	2	2	.336	.414	.690	1.104
14	Nelson Cruz N. Cruz	0.1	187	18	50	35	52	12	0	38	19	1	45	1	1	207	118	30	0	0	2	5	.278	.348	.631	.979
15	Todd Walker T. Walker	0.1	52	5	15	9	15	1	1	6	1	2	3	0	0	55	33	7	0	0	0	1	.288	.327	.635	.962
16	Paul Konerko P. Konerko	0.09	74	7	19	10	18	2	0	17	5	1	10	0	0	80	41	9	0	0	2	4	.243	.300	.554	.854
17	Jay Buhner J. Buhner	0.09	85	8	26	12	26	3	0	12	13	0	28	0	1	98	53	11	0	0	0	2	.306	.398	.624	1.021
18	Pete Alonso P. Alonso	0.09	54	5	16	12	15	1	0	11	14	1	19	2	0	70	31	6	0	1	1	2	.278	.429	.574	1.003
19	Kyle Schwarber K. Schwarber	0.09	228	21	69	42	54	6	0	34	44	4	71	5	0	278	123	27	0	2	5	4	.237	.367	.539	.906
20	Mark Vientos M. Vientos	0.09	55	5	13	8	18	2	0	14	3	0	19	0	0	58	35	7	0	0	0	1	.327	.362	.636	.998
21	Rafael Devers R. Devers	0.09	89	8	26	21	27	0	0	26	12	0	25	1	0	102	51	8	0	1	0	1	.303	.382	.573	.955
22	Kirk Gibson K. Gibson	0.09	78	7	21	13	22	2	0	21	12	1	19	9	1	92	45	9	0	1	2	0	.282	.380	.577	.957
23	Lenny Dykstra L. Dykstra	0.09	112	10	32	27	36	6	1	19	20	2	23	5	0	136	74	17	2	0	3	0	.321	.433	.661	1.094
24	Bryce Harper B. Harper	0.09	193	17	53	41	54	13	1	34	35	2	53	8	1	232	120	31	1	1	4	5	.280	.394	.622	1.016
25	Jorge Soler J. Soler	0.09	80	7	30	12	22	6	1	12	15	0	28	0	0	95	51	14	0	0	0	1	.275	.389	.638	1.027