highest home runs per single in a season at least 3.1 pa per team game before 1990

Before 1990, Roger Maris had the most home runs per single in a season, with 0.78 in 1961.

Interpreted as:

highest home runs per single by a player in a season at least 3.1 pa per team game before 1990

	NAME	HR/1B	PA/TM GMS	HR	1B	PA	TM GMS	SEASON	TM	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Roger Maris R. Maris	0.78	4.28	61	78	698	163	1961	NYY	161	590	132	159	16	4	141	94	7	67	0	0	366	81	0	7	0	16	.269	.372	.620	.993	138	55.9	.424	162	55.1
2	Harmon Killebrew H. Killebrew	0.75	4.09	48	64	666	163	1962	MIN	155	552	85	134	21	1	126	106	4	142	1	2	301	70	0	4	6	14	.243	.366	.545	.912	116	38.8	.395	138	31.6
3	Babe Ruth B. Ruth	0.74	4	54	73	616	154	1920	NYY	142	458	158	172	36	9	135	150	3	80	14	14	388	99	5				.376	.532	.847	1.379	191	120.9	.597	237	110.5
4	Gorman Thomas G. Thomas	0.73	4.15	45	62	668	161	1979	MIL	156	557	97	136	29	0	123	98	2	175	1	5	300	74	5	6	6	8	.244	.356	.539	.895	111	33.5	.387	139	31.5
5	Reggie Jackson R. Jackson	0.72	4.18	47	65	677	162	1969	OAK	152	549	123	151	36	3	118	114	12	142	13	5	334	86	1	1	20	8	.275	.410	.608	1.018	137	64.9	.442	179	62.1
6	Mike Schmidt M. Schmidt	0.71	4.14	45	63	675	163	1979	PHI	160	541	109	137	25	4	114	120	3	115	9	5	305	74	2	9	12	13	.253	.386	.564	.950	123	44.3	.407	151	41
7	Babe Ruth B. Ruth	0.69	4.53	59	85	693	153	1921	NYY	152	540	177	204	44	16	168	145	4	81	17	13	457	119	4				.378	.512	.846	1.359	214	127.8	.575	224	118.7
8	Willie Stargell W. Stargell	0.67	3.76	44	66	609	162	1973	PIT	148	522	106	156	43	3	119	80	3	129	0	0	337	90	0	4	22	6	.299	.392	.646	1.038	125	57.5	.443	181	56.6
9	Kevin Mitchell K. Mitchell	0.66	3.95	47	71	640	162	1989	SFG	154	543	100	158	34	6	125	87	3	115	3	4	345	87	0	7	32	6	.291	.388	.635	1.023	126	56.8	.431	185	59.2
10	Babe Ruth B. Ruth	0.66	4.44	54	82	684	154	1928	NYY	154	536	163	173	29	8	146	137	3	87	4	5	380	91	8				.323	.463	.709	1.172	174	90.6	.510	201	89.3
11	Hank Greenberg H. Greenberg	0.66	3.9	44	67	604	155	1946	DET	142	523	90	145	29	5	127	80	0	88	5	1	316	78	1			17	.277	.373	.604	.977	115	51.5	.446	165	44.8
12	Hank Greenberg H. Greenberg	0.64	4.39	58	90	681	155	1938	DET	155	556	143	175	23	4	147	119	3	92	7	5	380	85	3				.315	.438	.683	1.122	166	80.3	.489	162	62
13	Harmon Killebrew H. Killebrew	0.64	3.7	45	70	596	161	1963	MIN	142	515	88	133	18	0	96	72	3	105	0	0	286	63	0	6	4	16	.258	.349	.555	.904	102	40.1	.394	147	32.2
14	Mike Schmidt M. Schmidt	0.63	4.02	48	76	652	162	1980	PHI	150	548	104	157	25	8	121	89	2	119	12	5	342	81	0	13	10	6	.286	.380	.624	1.004	127	54.1	.428	172	52.7
15	Dave Kingman D. Kingman	0.63	3.35	36	57	543	162	1975	NYM	134	502	65	116	22	1	88	34	4	153	7	5	248	59	1	2	5	13	.231	.284	.494	.778	70	10.1	.346	115	9.6
16	Babe Ruth B. Ruth	0.63	4.46	60	95	691	155	1927	NYY	151	540	158	192	29	8	165	137	0	89	7	6	417	97	14				.356	.486	.772	1.258	195	109.9	.545	212	104.8
17	Ralph Kiner R. Kiner	0.63	4.36	47	75	672	154	1950	PIT	150	547	112	149	21	6	118	122	3	79	2		323	74	0			22	.272	.408	.590	.998	136	52	.441	152	44.9
18	Willie Stargell W. Stargell	0.62	3.74	48	77	606	162	1971	PIT	141	511	104	151	26	0	125	83	7	154	0	0	321	74	0	5	20	8	.295	.398	.628	1.026	122	59.7	.445	186	57.3
19	Jim Gentile J. Gentile	0.62	3.69	46	74	601	163	1961	BAL	148	486	96	147	25	2	141	96	11	106	1	1	314	73	0	8	5	12	.302	.423	.646	1.069	133	62.4	.453	180	60.9
20	Mickey Mantle M. Mantle	0.62	3.96	54	87	646	163	1961	NYY	153	514	131	163	16	6	128	126	0	112	12	1	353	76	1	5	9	2	.317	.448	.687	1.135	156	79.6	.478	197	78.8
21	Willie McCovey W. McCovey	0.62	3.94	39	63	638	162	1970	SFG	152	495	98	143	39	2	126	137	3	75	0	0	303	80	0	3	40	13	.289	.444	.612	1.056	133	61.2	.443	169	54.8
22	Harmon Killebrew H. Killebrew	0.62	4.2	42	68	647	154	1959	WSH	153	546	98	132	20	2	105	90	7	116	3	2	282	64	0	4	1	12	.242	.354	.516	.870	106	31.9	.381	135	26.9
23	Mark McGwire M. McGwire	0.61	3.96	49	80	641	162	1987	OAK	151	557	97	161	28	4	118	71	5	131	1	1	344	81	0	8	8	6	.289	.370	.618	.987	124	45.2	.411	157	46.2
24	Dave Kingman D. Kingman	0.61	3.15	37	61	510	162	1976	NYM	123	474	70	113	14	1	86	28	5	135	7	4	240	52	0	3	4	11	.238	.286	.506	.793	69	15.9	.358	126	14.7
25	Ron Kittle R. Kittle	0.6	3.24	32	53	525	162	1984	CWS	139	466	67	100	15	0	74	49	6	137	3	6	211	47	0	4	5	7	.215	.295	.453	.748	64	5	.330	102	1