Jim Whitney has the highest batting average by a pitcher in a season, with an average of .323 in 1882.

Interpreted as:

highest batting average with a minimum of 3.1 PA per team game by a pitcher in a season

	NAME	AVG	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	PA	TB	XBH	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Jim Whitney J. Whitney	.323	1882	BOS	61	251	49	81	18	7	5	48	24		13	275	128	30		.510		65	26	.399	162	25.3
2	Jim Devlin J. Devlin	.315	1876	LOU	68	298	38	94	14	1	0	28	1		11	299	110	15		.369		54	9.3	.318	109	4.2
3	Al Spalding A. Spalding	.312	1876	CWS	66	292	54	91	14	2	0	44	6		3	298	109	16		.373		55	10.8	.324	119	8.4
4	Charlie Sweeney C. Sweeney	.307	1884	TOT	86	339	55	104	23	2	2	19	21		17	360	137	27		.404		71	18.4	.345	136	19
5	Curry Foley C. Foley	.292	1880	BOS	80	332	44	97	13	2	2	31	8		14	340	120	17		.361		53	9.4	.305	121	9.3
6	Terry Larkin T. Larkin	.288	1878	CWS	58	226	33	65	9	4	0	32	17		17	243	82	13		.363		42	9	.329	121	7
7	John Ward J. Ward	.286	1879	PRO	83	364	71	104	9	4	2	41	7		14	371	127	15		.349		58	6.4	.293	112	6.4
8	Old Hoss Radbourn O. Hoss Radbourn	.283	1883	PRO	89	381	59	108	11	3	3	48	14		16	395	134	17		.352		64	4.8	.301	104	2.5
9	Jim Whitney J. Whitney	.281	1883	BSN	96	409	78	115	27	10	5	57	25		29	434	177	42		.433		83	18	.337	121	14.8
10	Tony Mullane T. Mullane	.276	1884	TOL	95	352	49	97	19	3	3		33	1		386	131	25	.339	.372	.712	72	15.3	.330	122	12.7
11	Henry Porter H. Porter	.275	1884	MIL	11	40	3	11	3	0	0		0			40	14	3		.350		6	0.1	.283	-235	-19
12	Guy Hecker G. Hecker	.271	1883	LOU	81	332	59	90	6	6	1		12			344	111	13		.334		52	0.4	.288	104	2
13	Jim Devlin J. Devlin	.269	1877	LOU	61	268	38	72	6	3	1	27	7		27	275	87	10		.325		39	-1.2	.283	85	-6.3
14	Charlie Buffinton C. Buffinton	.267	1884	BSN	87	352	48	94	18	3	1	39	16		12	368	121	22		.344		58	4.8	.296	103	1.8
15	Tony Mullane T. Mullane	.257	1882	LOU	77	303	46	78	13	1	0		13			316	93	14		.307		44	-0.4	.274	103	1.3
16	Jim McCormick J. McCormick	.256	1881	CLE	70	309	45	79	9	4	0	26	5		16	314	96	13		.311		37	-5.8	.266	87	-5.6
17	Jim Whitney J. Whitney	.255	1881	BOS	75	282	37	72	17	3	0	32	19		18	301	95	20		.337		42	1.7	.297	101	0.6
18	Lee Richmond L. Richmond	.250	1881	WOR	61	252	31	63	5	1	0	28	10		10	262	70	6		.278		30	-5.8	.261	74	-9.5
19	Lon Knight L. Knight	.250	1876	PHI	55	240	32	60	9	3	0	24	2		2	242	75	12		.313		33	-2.9	.262	85	-5.5
20	Pud Galvin P. Galvin	.249	1879	BUF	67	265	34	66	11	6	0	27	1		56	266	89	17		.336		35	-1.7	.262	91	-3.6
21	George Bradley G. Bradley	.249	1876	STL	64	265	29	66	7	6	0	28	3		12	268	85	13		.321		38	-2.4	.266	101	0.2
22	George Bradley G. Bradley	.247	1879	TRO	63	251	36	62	9	5	0	23	1		20	252	81	14		.323		32	-2.8	.256	90	-3.5
23	Jim McCormick J. McCormick	.246	1880	CLE	78	289	34	71	11	0	0	26	5		5	294	82	11		.284		33	-4.1	.248	91	-3.5
24	George Bradley G. Bradley	.243	1877	CWS	55	214	31	52	7	3	0	12	6		19	220	65	10		.304		27	-4.6	.263	79	-7
25	Tommy Bond T. Bond	.241	1879	BOS	65	257	35	62	3	1	0	21	6		8	263	67	4		.261		30	-6.4	.239	81	-7.2