Willie Mays had his best OPS in a month in October 1964, with an OPS of 1.743.

	NAME	OPS	MONTH	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG
1	Willie Mays W. Mays	1.743	October 1964	4	16	5	8	2	0	3	8	2	0	1	0	0	18	19	5	0	0	0	0	.500	.556	1.188
2	Willie Mays W. Mays	1.592	April 1964	11	43	18	21	2	1	7	20	3	0	1	2	0	46	46	10	0	0	0	1	.488	.522	1.070
3	Willie Mays W. Mays	1.571	October 1962	3	11	4	5	0	0	2	4	3	0	0	1	0	14	11	2	0	0	2	0	.455	.571	1.000
4	Willie Mays W. Mays	1.400	October 1960	1	5	1	2	0	0	1	3	0	0	1	1	0	5	5	1	0	0	0	0	.400	.400	1.000
5	Willie Mays W. Mays	1.350	October 1970	1	4	1	2	1	0	0	0	1	0	0	0	0	5	3	1	0	0	1	0	.500	.600	.750
6	Willie Mays W. Mays	1.308	September 1955	23	91	20	36	5	3	11	31	6	0	8	7	2	98	80	19	0	1	0	0	.396	.429	.879
7	Willie Mays W. Mays	1.299	May 1958	30	121	25	49	7	5	12	29	14	0	10	6	3	138	102	24	0	3	2	2	.405	.457	.843
8	Willie Mays W. Mays	1.287	August 1965	31	113	32	41	3	0	17	29	17	0	19	1	1	131	95	20	1	0	3	1	.363	.446	.841
9	Willie Mays W. Mays	1.286	October 1961	2	7	2	3	0	0	1	3	0	0	1	1	0	7	6	1	0	0	0	0	.429	.429	.857
10	Willie Mays W. Mays	1.254	September 1959	23	83	22	30	6	0	10	20	14	1	4	1	0	98	66	16	0	0	3	0	.361	.459	.795
11	Willie Mays W. Mays	1.242	May 1954	28	99	25	37	4	3	11	31	12	0	8	2	0	113	80	18	0	2		4	.374	.434	.808
12	Willie Mays W. Mays	1.216	May 1965	30	102	24	35	8	0	12	25	18	0	12	1	2	120	79	20	0	0	4	0	.343	.442	.775
13	Willie Mays W. Mays	1.210	May 1962	30	106	26	37	9	3	9	25	23	0	16	6	1	129	79	21	0	0	2	0	.349	.465	.745
14	Willie Mays W. Mays	1.194	June 1960	27	106	26	41	10	2	9	31	9	0	16	6	1	119	82	21	0	4	0	2	.387	.420	.774
15	Willie Mays W. Mays	1.190	May 1972	13	32	10	12	2	0	2	5	14	0	9	0	1	46	20	4	0	0	2	0	.375	.565	.625
16	Willie Mays W. Mays	1.190	June 1961	30	115	31	42	10	1	10	26	20	0	16	4	2	135	84	21	0	0	5	3	.365	.459	.730
17	Willie Mays W. Mays	1.180	September 1958	24	99	26	43	9	1	4	18	16	0	8	7	1	115	66	14	0	0	1	3	.434	.513	.667
18	Willie Mays W. Mays	1.173	August 1963	28	111	24	43	8	3	8	27	12	0	12	3	2	124	81	19	0	1	0	2	.387	.444	.730
19	Willie Mays W. Mays	1.159	August 1957	31	124	27	47	4	6	9	25	14	1	10	4	4	143	90	19	0	4	5	3	.379	.434	.726
20	Willie Mays W. Mays	1.157	September 1968	27	69	17	26	3	0	6	18	13	1	12	4	1	84	47	9	0	1	1	1	.377	.476	.681
21	Willie Mays W. Mays	1.157	April 1960	15	59	14	27	7	0	1	9	8	1	6	5	3	68	37	8	0	0	2	3	.458	.529	.627
22	Willie Mays W. Mays	1.147	April 1971	20	72	16	26	6	1	5	18	15	1	15	3	0	90	49	12	0	2	1	3	.361	.467	.681
23	Willie Mays W. Mays	1.129	July 1954	29	112	28	37	6	1	12	26	14	1	9	1	1	128	81	19	0	1		2	.330	.406	.723
24	Willie Mays W. Mays	1.118	August 1966	27	92	21	30	6	1	9	19	14	0	16	0	0	107	65	16	0	1	1	2	.326	.411	.707
25	Willie Mays W. Mays	1.099	September 1963	23	90	19	34	8	1	6	16	7	0	7	0	0	100	62	15	0	3	2	3	.378	.410	.689