Frank Robinson has the best career batting average with 50+ at-bats on August 31, with an average of .403.

Interpreted as:

most ba by a player on august 31, minimum 50 ab

	NAME	AVG	AB	G	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	OBP	SLG	OPS
1	Frank Robinson F. Robinson	.403	62	17	9	25	2	0	2	7	8	1	5	1	0	71	33	4	0	0	1	1	.479	.532	1.011
2	George Sisler G. Sisler	.400	65	16	9	26	7	0	1	12	3	2	1	3		70	36	8	0				.443	.554	.997
3	Torii Hunter T. Hunter	.397	58	14	9	23	5	0	2	13	2	0	9	2	0	61	34	7	0	1	0	3	.410	.586	.996
4	Nap Lajoie N. Lajoie	.389	54	14	7	21	2	0	0		2	0		3		60	23	2	4				.411	.426	.837
5	Ty Cobb T. Cobb	.383	81	20	15	31	3	1	1	8	10	0		6		91	39	5	0				.451	.481	.932
6	Nick Markakis N. Markakis	.377	53	14	7	20	5	0	2	9	6	0	4	0	0	59	31	7	0	0	0	2	.441	.585	1.026
7	George Kell G. Kell	.375	56	13	9	21	2	1	2	14	4	0	1	2	0	60	31	5	0	0	0	2	.417	.554	.970
8	Dave Philley D. Philley	.373	51	15	8	19	1	0	2	9	3	0	3	0	0	54	26	3	0	0	0	1	.407	.510	.917
9	Rafael Palmeiro R. Palmeiro	.371	62	17	13	23	5	0	1	5	13	0	7	1	0	75	31	6	0	0	0	2	.480	.500	.980
10	Tristram Speaker T. Speaker	.361	61	16	7	22	5	1	0		6	0		1		67	29	6	0				.418	.475	.893
11	Harry Heilmann H. Heilmann	.358	53	13	9	19	6	0	2	9	6	1	0	0		60	31	8	0				.433	.585	1.018
12	Cal Ripken Jr. C. Ripken Jr.	.358	67	18	11	24	2	0	2	9	5	0	4	1	0	74	32	4	0	2	0	1	.392	.478	.870
13	Robin Yount R. Yount	.357	70	19	14	25	6	2	2	13	8	0	8	2	1	78	41	10	0	0	0	2	.423	.586	1.009
14	Joey Votto J. Votto	.353	51	13	9	18	4	0	2	11	7	0	8	0	1	58	28	6	0	0	2	2	.431	.549	.980
15	Dusty Baker D. Baker	.353	51	14	5	18	2	0	0	6	4	0	6	0	1	58	20	2	1	2	1	1	.386	.392	.778
16	Willie Davis W. Davis	.353	51	13	6	18	4	1	2	8	3	0	3	2	1	55	30	7	0	1	2	0	.382	.588	.970
17	Pie Traynor P. Traynor	.351	57	14	11	20	2	0	1	10	2	1	0	2		62	25	3	2				.383	.439	.822
18	Honus Wagner H. Wagner	.351	57	15	14	20	4	2	0		6	1		10		64	28	6	0				.422	.491	.913
19	Ivan Rodriguez I. Rodriguez	.346	52	13	12	18	4	0	3	8	3	0	12	1	0	55	31	7	0	0	0	1	.382	.596	.978
20	Sam Crawford S. Crawford	.346	52	13	13	18	1	3	2	13	3	0		1		57	31	6	2				.382	.596	.978
21	Jim Thome J. Thome	.345	55	14	11	19	5	0	4	12	8	0	15	0	0	64	36	9	0	1	1	1	.422	.655	1.076
22	Wade Boggs W. Boggs	.345	55	13	9	19	3	1	0	2	3	0	11	0	0	58	24	4	0	0	0	2	.379	.436	.816
23	Michael Young M. Young	.345	58	13	7	20	4	1	2	9	3	0	10	2	0	63	32	7	0	2	1	0	.365	.552	.917
24	Roberto Alomar R. Alomar	.345	58	14	12	20	8	2	0	5	7	0	5	7	0	65	32	10	0	0	3	2	.415	.552	.967
25	Pete Rose P. Rose	.342	73	18	13	25	2	2	0	7	3	0	7	0	1	78	31	4	1	1	0	3	.364	.425	.788