Rogers Hornsby had the highest batting average in 1921, with an average of .397.

Interpreted as:

highest batting average with a minimum of 3.1 PA per team game by a player 1921

	NAME	AVG	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Rogers Hornsby R. Hornsby	.397	1921	SLN	154	592	131	235	44	18	21	126	60	7	48	13	13	674	378	83	15	.458	.639	1.097	162	77.5	.489	191	77.7
2	Harry Heilmann H. Heilmann	.394	1921	DET	149	602	114	237	43	14	19	139	53	2	37	2	6	672	365	76	15	.444	.606	1.051	151	67.5	.472	164	59.5
3	Ty Cobb T. Cobb	.389	1921	DET	128	507	124	197	37	16	12	101	56	3	19	22	15	581	302	65	15	.452	.596	1.048	131	58.2	.471	164	51.2
4	Babe Ruth B. Ruth	.378	1921	NYY	152	540	177	204	44	16	59	168	145	4	81	17	13	693	457	119	4	.512	.846	1.359	214	127.8	.575	224	118.7
5	George Sisler G. Sisler	.371	1921	SLA	138	582	125	216	38	18	12	104	34	5	27	35	11	635	326	68	14	.411	.560	.971	125	46	.437	140	35.3
6	Tristram Speaker T. Speaker	.362	1921	CLE	132	506	107	183	52	14	3	75	68	2	12	2	4	588	272	69	12	.439	.538	.977	119	45.8	.444	146	37.3
7	Baby Doll Jacobson B. Doll Jacobson	.352	1921	SLA	151	599	90	211	38	14	5	90	42	3	30	8	8	663	292	57	19	.398	.487	.885	113	30.4	.404	121	19.2
8	Jack Tobin J. Tobin	.352	1921	SLA	150	671	132	236	31	18	8	59	45	3	22	7	12	731	327	57	12	.395	.487	.882	124	32.7	.403	120	20.3
9	Austin McHenry A. McHenry	.350	1921	SLN	152	574	92	201	37	8	17	102	38	2	48	10	20	628	305	62	14	.393	.531	.924	114	35.6	.418	145	35.8
10	Ken Williams K. Williams	.347	1921	SLA	146	547	115	190	31	7	24	117	74	4	42	20	17	646	307	62	21	.429	.561	.990	133	52.1	.447	146	41.1
11	Jack Fournier J. Fournier	.343	1921	SLN	149	574	103	197	27	9	16	86	56	8	48	20	22	661	290	52	23	.409	.505	.914	120	37.6	.418	145	37.8
12	Irish Meusel I. Meusel	.343	1921	TOT	146	586	96	201	33	13	14	87	33	2	29	13	13	629	302	60	8	.380	.515	.895	108	29	.405	129	23
13	Frankie Frisch F. Frisch	.341	1921	NYG	153	618	121	211	31	17	8	100	42	1	28	49	13	687	300	56	26	.384	.485	.870	113	26.9	.396	130	26.3
14	Bobby Veach B. Veach	.338	1921	DET	150	612	110	207	43	13	16	128	48	1	31	14	10	688	324	72	27	.387	.529	.917	123	36.6	.413	130	28.4
15	Eddie Collins E. Collins	.337	1921	CWS	139	526	79	177	20	10	2	58	66	2	11	12	10	607	223	32	13	.412	.424	.836	97	21.7	.392	117	14.5
16	Sam Rice S. Rice	.330	1921	WSH	143	561	83	185	39	13	4	79	38	9	10	26	12	630	262	56	22	.382	.467	.849	100	20.9	.389	118	15.7
17	Ross Youngs R. Youngs	.327	1921	NYG	141	504	90	165	24	16	3	102	71	1	47	21	17	594	230	43	18	.411	.456	.868	100	26	.402	134	25.5
18	Harry Hooper H. Hooper	.327	1921	CWS	108	419	74	137	26	5	8	58	55	1	21	13	7	487	197	39	12	.406	.470	.876	83	22.3	.404	125	16.5
19	Jimmy Johnston J. Johnston	.325	1921	BKN	152	624	104	203	41	14	5	56	45	1	26	28	16	689	287	60	19	.372	.460	.832	104	18.1	.380	120	17.5
20	Del Pratt D. Pratt	.324	1921	BSA	135	521	80	169	36	10	5	102	44	1	10	8	10	574	240	51	8	.378	.461	.839	89	17	.384	115	11.6
21	Hank Severeid H. Severeid	.324	1921	SLA	143	472	66	153	23	7	2	78	42	0	9	7	2	531	196	32	17	.379	.415	.795	76	9.4	.370	101	0.4
22	Carson Bigbee C. Bigbee	.323	1921	PIT	147	632	100	204	23	17	3	42	41	0	19	21	20	684	270	43	11	.364	.427	.791	94	9.1	.364	109	7.7
23	Ray Grimes R. Grimes	.321	1921	CHC	147	530	91	170	38	6	6	79	70	6	55	5	8	622	238	50	16	.406	.449	.855	103	25	.397	130	23.6
24	Zack Wheat Z. Wheat	.320	1921	BKN	148	568	91	182	31	10	14	85	44	3	19	11	8	624	275	55	9	.372	.484	.857	99	21.2	.390	126	20.7
25	Cy Williams C. Williams	.320	1921	PHN	146	562	67	180	28	6	18	75	30	2	32	5	15	603	274	52	9	.357	.488	.844	92	17	.382	110	7.5