Ted Williams has the highest slugging percentage when making 20+ plate appearances in a month, with a slugging percentage of 1.526 in September 1957.

Interpreted as:

highest slg by a player in a month with 20+ pa

	NAME	SLG	PA	MONTH	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	OPS
1	Ted Williams T. Williams	1.526	33	September 1957	12	19	9	12	2	0	5	9	13	1	3	0	0	29	7	0	0	2	0	.632	.788	2.314
2	Kyle Schwarber K. Schwarber	1.467	20	October 2022	5	15	5	8	0	1	4	7	5	0	3	1	0	22	5	0	0	0	0	.533	.650	2.117
3	Barry Bonds B. Bonds	1.429	25	October 2001	6	14	10	8	0	0	4	5	10	1	1	0	0	20	4	0	0	4	0	.571	.760	2.189
4	Reggie Jackson R. Jackson	1.294	20	October 1980	5	17	5	8	1	2	3	9	3	0	4	0	0	22	6	0	0	1	0	.471	.550	1.844
5	Willie McCovey W. McCovey	1.278	22	August 1962	12	18	5	7	1	0	5	13	3	0	5	0	0	23	6	0	1	1	1	.389	.455	1.732
6	Don Drysdale D. Drysdale	1.263	20	August 1958	6	19	6	8	1	0	5	9	1	0	6	0	0	24	6	0	0	0	0	.421	.450	1.713
7	Andrew Toles A. Toles	1.250	24	August 2016	9	20	8	11	3	1	3	12	2	1	3	0	0	25	7	0	1	1	1	.550	.583	1.833
8	Sammy Sosa S. Sosa	1.238	26	October 2001	6	21	7	10	1	0	5	11	5	0	5	0	0	26	6	0	0	2	1	.476	.577	1.815
9	George Brett G. Brett	1.235	21	October 1985	5	17	6	8	1	0	4	9	4	0	1	0	0	21	5	0	0	0	0	.471	.571	1.807
10	Carlos Pena C. Pena	1.226	36	August 2005	9	31	10	14	3	0	7	16	4	1	7	0	0	38	10	0	0	0	0	.452	.528	1.754
11	Jim Edmonds J. Edmonds	1.211	25	October 2001	6	19	6	11	3	0	3	9	6	0	1	1	0	23	6	0	0	0	0	.579	.680	1.891
12	Tony Perez T. Perez	1.211	24	May 1985	7	19	5	10	1	0	4	13	5	0	1	0	0	23	5	0	0	0	0	.526	.625	1.836
13	Jason Giambi J. Giambi	1.188	21	October 2001	5	16	6	7	3	0	3	7	5	0	2	0	0	19	6	0	0	1	0	.438	.571	1.759
14	Raul Mondesi R. Mondesi	1.158	22	April 1995	5	19	9	10	3	0	3	7	2	1	0	2	0	22	6	0	0	0	0	.526	.591	1.749
15	Gabe Kapler G. Kapler	1.148	32	June 2009	13	27	6	12	5	1	4	14	4	0	3	1	1	31	10	0	1	1	0	.444	.500	1.648
16	Adam Duvall A. Duvall	1.138	32	April 2023	7	29	10	14	5	1	4	13	3	0	3	0	0	33	10	0	0	0	0	.483	.531	1.669
17	Mookie Betts M. Betts	1.136	29	March 2024	6	22	9	11	2	0	4	10	7	0	2	0	0	25	6	0	0	0	1	.500	.621	1.757
18	Richie Sexson R. Sexson	1.136	24	October 2001	6	22	6	10	0	0	5	14	2	0	3	0	0	25	5	0	0	0	0	.455	.500	1.636
19	Ripper Collins R. Collins	1.136	24	May 1936	11	22	6	12	2	1	3	7	2	0	2	0		25	6	0				.545	.583	1.720
20	Joc Pederson J. Pederson	1.133	21	March 2019	4	15	8	7	1	0	3	5	4	2	2	0	0	17	4	0	0	0	0	.467	.619	1.752
21	Barry Bonds B. Bonds	1.132	92	April 2004	23	53	21	25	5	0	10	22	39	0	6	2	0	60	15	0	0	18	2	.472	.696	1.828
22	Randy Jackson R. Jackson	1.130	27	April 1955	6	23	11	10	1	0	5	11	3	0	3	0	1	26	6	1	0	1	1	.435	.500	1.630
23	Bo Jackson B. Jackson	1.125	20	August 1990	5	16	6	8	1	0	3	7	3	0	0	2	1	18	4	0	1	0	0	.500	.550	1.675
24	Tony Cloninger T. Cloninger	1.111	20	July 1966	9	18	6	8	3	0	3	12	0	2	2	0	0	20	6	0	0	0	0	.444	.500	1.611
25	Shane Spencer S. Spencer	1.105	42	September 1998	14	38	11	16	2	0	8	21	4	0	7	0	0	42	10	0	0	0	0	.421	.476	1.581