Hugh Duffy has the highest batting average with 15+ home runs in a season, with an average of .440 in 1894.

Interpreted as:

highest ba by a player in a season with 15 or more hr

	NAME	AVG	HR	SEASON	TM	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Hugh Duffy H. Duffy	.440	18	1894	BSN	125	539	160	237	51	16	145	66	1	15	48		616	374	85	10				.502	.694	1.196	203	91.3	.526	169	80.7
2	Rogers Hornsby R. Hornsby	.424	25	1924	SLN	143	536	121	227	43	14	94	89	2	32	5	12	640	373	82	13				.507	.696	1.203	175	96.7	.537	221	95.9
3	George Sisler G. Sisler	.407	19	1920	SLA	154	631	137	257	49	18	122	46	2	19	42	17	692	399	86	13				.449	.632	1.082	161	82.5	.494	176	68.6
4	Ted Williams T. Williams	.406	37	1941	BSA	143	456	135	185	33	3	120	147	3	27	2	4	606	335	73	0			10	.553	.735	1.287	179	108.8	.568	221	96.9
5	Rogers Hornsby R. Hornsby	.403	39	1925	SLN	138	504	133	203	41	10	143	83	2	39	5	3	605	381	90	16				.489	.756	1.245	173	94.1	.540	208	90.1
6	Harry Heilmann H. Heilmann	.403	18	1923	DET	144	524	121	211	44	11	115	74	5	40	9	7	626	331	73	23				.481	.632	1.113	155	78	.503	189	73.3
7	Rogers Hornsby R. Hornsby	.401	42	1922	SLN	154	623	141	250	46	14	152	65	1	50	17	12	704	450	102	15				.459	.722	1.181	186	97.8	.520	197	92.7
8	Bill Terry B. Terry	.401	23	1930	NYG	154	633	139	254	39	15	129	57	1	33	8		710	392	77	19				.452	.619	1.071	171	71.2	.468	156	62.1
9	Lefty O'Doul L. O'Doul	.398	32	1929	PHN	154	638	152	254	35	6	122	76	4	19	2		731	397	73	13				.465	.622	1.087	178	80.8	.483	158	62.3
10	Rogers Hornsby R. Hornsby	.397	21	1921	SLN	154	592	131	235	44	18	126	60	7	48	13	13	674	378	83	15				.458	.639	1.097	162	77.5	.489	191	77.7
11	Harry Heilmann H. Heilmann	.394	19	1921	DET	149	602	114	237	43	14	139	53	2	37	2	6	672	365	76	15				.444	.606	1.051	151	67.5	.472	164	59.5
12	Babe Ruth B. Ruth	.393	41	1923	NYY	152	522	151	205	45	13	130	170	4	93	17	21	699	399	99	3				.545	.764	1.309	211	124.7	.571	230	120.4
13	Babe Herman B. Herman	.393	35	1930	BKN	153	614	143	241	48	11	130	66	4	56	18		699	416	94	15				.455	.678	1.132	180	81.8	.487	167	72.9
14	Sam Thompson S. Thompson	.392	18	1895	PHI	119	538	131	211	45	21	165	31	5	11	27		576	352	84	2				.430	.654	1.085	158	62.8	.480	162	60.9
15	Al Simmons A. Simmons	.392	15	1927	PHA	106	406	86	159	36	11	108	31	1	30	10	2	458	262	62	20				.436	.645	1.081	107	50.7	.484	171	44
16	Al Simmons A. Simmons	.390	22	1931	PHA	128	513	105	200	37	13	128	47	3	45	3	3	563	329	72	0				.444	.641	1.085	135	65.1	.484	176	57.9
17	George Brett G. Brett	.390	24	1980	KCR	117	449	87	175	33	9	118	58	1	22	15	6	515	298	66	0	7	16	11	.454	.664	1.118	120	62.7	.478	198	59.2
18	Ted Williams T. Williams	.388	38	1957	BOS	132	420	96	163	28	1	87	119	5	43	0	1	546	307	67	0	2	33	11	.526	.731	1.257	148	87.3	.524	223	79
19	Al Simmons A. Simmons	.387	24	1925	PHA	153	654	122	253	43	12	129	35	1	41	7	14	696	392	79	6				.419	.599	1.018	150	58.6	.455	150	49.6
20	Rogers Hornsby R. Hornsby	.387	21	1928	BSN	140	486	99	188	42	7	94	107	1	41	5		619	307	70	25				.498	.632	1.130	156	80.2	.506	196	78.1
21	Chuck Klein C. Klein	.386	40	1930	PHN	156	648	158	250	59	8	170	54	4	50	4		719	445	107	13				.436	.687	1.123	181	80	.481	152	58.7
22	Arky Vaughan A. Vaughan	.385	19	1935	PIT	137	499	108	192	34	10	99	97	7	18	4		610	303	63	7			5	.491	.607	1.098	151	75	.493	194	72.7
23	Rogers Hornsby R. Hornsby	.384	17	1923	SLN	107	424	89	163	32	10	83	55	3	29	3	7	487	266	59	5				.459	.627	1.086	116	55.4	.490	184	53.3
24	Lefty O'Doul L. O'Doul	.383	22	1930	PHN	140	528	122	202	37	7	97	63	5	21	3		606	319	66	10				.453	.604	1.057	144	58.3	.464	143	40.3
25	Babe Herman B. Herman	.381	21	1929	BKN	146	569	105	217	42	13	113	55	0	45	21		637	348	76	13				.436	.612	1.047	144	59.7	.463	155	51.1