Before 1900, Buck Freeman had the highest slugging percentage, with a slugging percentage of .550.

Interpreted as:

highest slg with a minimum of 1.55 PA per team game by a player before 1900

	NAME	SLG	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Buck Freeman B. Freeman	.550	189	713	127	230	22	28	28	144	32	22	31	23	773	392	78	6	.323	.370	.920	156	49.9	.423	139	43.1
2	Jimmy Williams J. Williams	.530	153	621	126	220	28	27	9	116	60	6	51	26	693	329	64	6	.354	.416	.946	150	54.3	.441	151	51.1
3	Nap Lajoie N. Lajoie	.523	390	1,640	326	569	114	50	25	366	49	29	66	65	1,733	858	189	15	.347	.377	.900	345	100.6	.416	136	93.9
4	Dan Brouthers D. Brouthers	.520	1,671	6,706	1,523	2,296	460	205	106	994	840	105	83	256	7,671	3,484	771	20	.342	.424	.943	1875	729.6	.436	155	656.7
5	Sam Thompson S. Thompson	.506	1,402	5,967	1,258	1,981	343	160	126	1,302	450	63	96	232	6,493	3,022	629	13	.332	.385	.891	1411	415.9	.411	136	376.5
6	Ed Delahanty E. Delahanty	.505	1,402	5,801	1,287	2,001	398	145	80	1,135	561	77	245	391	6,468	2,929	623	29	.345	.410	.915	1439	466.4	.427	141	424.8
7	Dave Orr D. Orr	.502	791	3,289	536	1,125	198	108	37	504	98	15		66	3,411	1,650	343		.342	.366	.867	743	238.6	.397	143	226
8	Joe Kelley J. Kelley	.493	992	3,836	909	1,304	210	120	46	777	571	49	229	329	4,519	1,892	376	63	.340	.432	.925	1027	332.8	.435	140	297
9	George Hall G. Hall	.492	121	537	104	185	22	21	5		20				557	264	48		.345			129	46.3	.390	145	38.1
10	Roger Connor R. Connor	.486	1,998	7,797	1,620	2,467	441	233	138	1,071	1,002	39	151	244	8,847	3,788	812	9	.316	.397	.883	1952	630.3	.409	142	569.9
11	Willie Keeler W. Keeler	.482	826	3,551	917	1,363	125	86	17	455	229	60	46	293	3,928	1,711	228	88	.384	.430	.912	862	258.9	.431	137	229.4
12	Jake Stenzel J. Stenzel	.479	768	3,031	664	1,024	190	71	32	533	300	58	110	292	3,425	1,452	293	36	.338	.408	.887	718	185.3	.415	129	170.1
13	Mike Donlin M. Donlin	.470	66	266	49	86	9	6	6	27	17	1	33	20	287	125	21	3	.323	.366	.836	51	11.1	.392	122	9
14	Jesse Burkett J. Burkett	.469	1,219	5,050	1,170	1,798	213	113	44	643	640	45	257	265	5,779	2,369	370	44	.356	.433	.902	1283	408.9	.430	139	355.9
15	Chick Stahl C. Stahl	.468	387	1,512	306	512	74	40	14	201	156	11	53	57	1,705	708	128	26	.339	.404	.873	334	96.6	.414	129	72.6
16	Bill Joyce B. Joyce	.467	906	3,310	822	971	153	106	70	609	721	108	303	266	4,163	1,546	329	24	.293	.435	.902	933	302.4	.430	139	267.6
17	Pete Browning P. Browning	.467	1,183	4,820	954	1,646	295	85	46	612	466	20	102	258	5,315	2,249	426	0	.341	.403	.869	1191	407.6	.407	147	381.3
18	Mike Tiernan M. Tiernan	.463	1,478	5,915	1,316	1,838	257	162	106	853	748	41	218	428	6,732	2,737	525	28	.311	.392	.855	1365	343.1	.402	131	326.1
19	Pearce Chiles P. Chiles	.462	97	338	57	108	28	7	2	76	16	1	19	6	356	156	37	1	.320	.352	.814	60	10.5	.380	118	9.4
20	Harry Stovey H. Stovey	.461	1,486	6,138	1,492	1,771	347	174	122	675	663	22	134	509	6,832	2,832	643		.289	.361	.822	1384	392.4	.380	132	326.1
21	Tip O'Neill T. O'Neill	.458	1,052	4,248	879	1,385	222	92	52	698	420	31	58	161	4,712	1,947	366		.326	.392	.851	1011	319.3	.400	134	253.6
22	Bill Lange B. Lange	.458	813	3,202	691	1,056	134	80	39	579	350	25	123	400	3,620	1,467	253	43	.330	.400	.858	718	157.6	.405	121	120.6
23	Honus Wagner H. Wagner	.457	361	1,405	218	453	92	20	19	258	86	18	70	84	1,528	642	131	19	.322	.369	.826	269	60	.390	123	51.3
24	Buck Ewing B. Ewing	.456	1,315	5,363	1,129	1,625	250	178	71	742	392	9	93	354	5,772	2,444	499	8	.303	.351	.807	1109	243.9	.372	122	194
25	Jake Beckley J. Beckley	.455	1,464	5,910	1,104	1,812	298	179	73	1,080	393	146	249	218	6,525	2,687	550	76	.307	.365	.819	1211	226.4	.384	119	196.5