Barry Bonds has the best OPS with 20+ games played in a month, with an OPS of 1.828 in April 2004.

Interpreted as:

highest ops by a player in a month with 20 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	1.828	23	April 2004	53	21	25	5	0	10	22	39	0	6	2	0	92	60	15	0	0	18	2	.472	.696	1.132
2	Josh Phelps J. Phelps	1.643	24	August 2007	31	9	16	3	1	4	12	6	0	4	0	0	38	33	8	0	1	0	0	.516	.579	1.065
3	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
4	Bob Bailey B. Bailey	1.593	24	July 1970	63	20	29	7	1	10	28	8	0	12	0	0	72	68	18	0	1	1	0	.460	.514	1.079
5	Todd Helton T. Helton	1.588	23	May 2000	82	32	42	7	0	11	26	18	0	9	0	0	102	82	18	0	2	5	2	.512	.588	1.000
6	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
7	Frank Thomas F. Thomas	1.581	25	May 1994	84	39	38	9	0	12	28	31	1	11	0	0	118	83	21	0	2	3	3	.452	.593	.988
8	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
9	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
10	Barry Bonds B. Bonds	1.581	23	July 2003	65	25	27	5	0	11	21	26	1	10	0	0	93	65	16	0	1	8	0	.415	.581	1.000
11	Barry Bonds B. Bonds	1.565	21	September 2001	63	18	23	4	0	12	20	28	1	10	2	1	92	63	16	0	0	4	1	.365	.565	1.000
12	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
13	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
14	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
15	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
16	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
17	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
18	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
19	Hal Jeffcoat H. Jeffcoat	1.500	22	May 1951	6	5	3	0	0	1	3	0	0	1	0	0	6	6	1	0			0	.500	.500	1.000
20	Jason Giambi J. Giambi	1.498	26	July 2005	76	20	27	5	0	14	24	21	6	20	0	0	103	74	19	0	0	2	1	.355	.524	.974
21	Ted Williams T. Williams	1.497	20	September 1942	65	26	28	4	0	9	20	25	0	5	0		90	59	13	0			3	.431	.589	.908
22	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
23	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
24	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
25	Chipper Jones C. Jones	1.470	26	July 1999	80	28	33	7	0	11	19	28	2	7	3	0	113	73	18	0	3	3	1	.413	.558	.913