Barry Bonds has the highest OPS with 27+ games played in a month, with an OPS of 1.615 in August 2004.

Interpreted as:

highest ops by a player in a month with 27 or more gp

	NAME	OPS	G	MONTH	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG
1	Barry Bonds B. Bonds	1.615	27	August 2004	70	27	29	6	1	11	27	38	0	7	2	1	109	70	18	0	1	15	0	.414	.615	1.000
2	Barry Bonds B. Bonds	1.583	27	May 2001	84	28	31	5	0	17	30	31	2	24	3	1	117	87	22	0	0	5	1	.369	.547	1.036
3	Barry Bonds B. Bonds	1.581	27	August 2002	76	24	34	6	0	11	25	37	1	7	1	1	116	73	17	0	2	11	1	.447	.621	.961
4	Babe Ruth B. Ruth	1.581	34	July 1920	100	45	44	10	2	13	33	43	1	19	5		147	97	25	3				.440	.611	.970
5	Babe Ruth B. Ruth	1.547	29	May 1928	99	32	41	5	4	15	37	28	1	20	0		129	99	24	1				.414	.547	1.000
6	Babe Ruth B. Ruth	1.540	29	June 1920	100	38	45	7	4	12	37	30	1	17	6		131	96	23	0				.450	.580	.960
7	Babe Ruth B. Ruth	1.537	29	June 1921	95	34	38	10	3	13	28	34	0	18	3		129	93	26	0				.400	.558	.979
8	Babe Ruth B. Ruth	1.507	28	August 1921	98	38	44	13	2	10	34	30	0	13	2		129	91	25	1				.449	.578	.929
9	Richard Hidalgo R. Hidalgo	1.504	28	September 2000	103	36	49	14	2	11	31	11	4	9	5	0	120	100	27	0	2	2	0	.476	.533	.971
10	Hank Greenberg H. Greenberg	1.504	27	September 1940	96	34	38	7	2	15	38	26	0	13	2		122	94	24	0			0	.396	.525	.979
11	Lou Gehrig L. Gehrig	1.501	28	June 1930	111	37	55	11	3	10	41	20	3	10	5		137	102	24	3				.495	.582	.919
12	Joe DiMaggio J. DiMaggio	1.487	29	July 1937	121	40	52	10	6	15	43	17	1	9	2		139	119	31	0				.430	.504	.983
13	Babe Ruth B. Ruth	1.477	28	June 1930	97	43	38	6	0	15	35	37	0	12	2		137	89	21	3				.392	.560	.918
14	Ted Williams T. Williams	1.472	28	July 1957	84	21	37	9	1	9	21	28	1	9	0	0	114	75	19	0	1	13	2	.440	.579	.893
15	Rogers Hornsby R. Hornsby	1.466	29	August 1924	106	29	54	13	2	8	22	15	0	7	0		127	95	23	6				.509	.570	.896
16	Rogers Hornsby R. Hornsby	1.464	28	June 1925	100	31	48	9	2	9	31	25	0	6	2		126	88	20	1				.480	.584	.880
17	Shohei Ohtani S. Ohtani	1.444	27	June 2023	104	27	41	7	3	15	29	21	0	26	4	1	126	99	25	0	1	2	2	.394	.492	.952
18	Babe Ruth B. Ruth	1.441	37	July 1924	131	43	59	9	3	14	40	31	0	16	2		164	116	26	2				.450	.556	.885
19	Joe Jackson J. Jackson	1.440	29	June 1912	102	28	54	16	8	1		7	2		4		113	89	25	2				.529	.568	.873
20	Babe Ruth B. Ruth	1.436	31	July 1923	111	36	51	9	3	10	27	29	0	18	1		140	96	22	0				.459	.571	.865
21	Chick Hafey C. Hafey	1.429	27	July 1928	106	30	49	18	2	9	34	8	1	10	3		116	98	29	1				.462	.504	.925
22	Norm Cash N. Cash	1.413	30	June 1961	101	25	42	1	3	14	25	19	1	12	1	0	122	91	18	1	0	6	4	.416	.512	.901
23	Babe Ruth B. Ruth	1.412	28	May 1930	94	35	36	5	1	13	33	32	0	14	6		128	82	19	2				.383	.540	.872
24	Lance Berkman L. Berkman	1.409	28	May 2008	104	31	49	11	1	9	22	18	1	18	6	1	123	89	21	0	0	6	1	.471	.553	.856
25	Sammy Sosa S. Sosa	1.405	29	August 2001	109	31	42	3	3	17	36	16	3	24	0	1	130	102	23	0	2	3	0	.385	.469	.936