Between the 1990 and 1999 seasons, Mark McGwire had the best slugging percentage, with a slugging percentage of .615.

Interpreted as:

highest slg with a minimum of 1.55 PA per team game by a player in the 1990s

	NAME	SLG	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Mark McGwire M. McGwire	.615	1,221	4,002	791	1,071	172	1	405	956	951	52	1,040	9	5	5,054	2,460	578	2	47	118	91	.268	.411	1.025	1037	427.7	.430	166	421.9
2	Barry Bonds B. Bonds	.602	1,434	4,894	1,091	1,478	299	42	361	1,076	1,146	45	747	343	94	6,146	2,944	702	1	60	257	96	.302	.434	1.036	1270	528.6	.434	172	538.6
3	Ken Griffey Jr. K. Griffey Jr.	.581	1,408	5,377	1,002	1,622	297	30	382	1,091	703	45	901	151	53	6,182	3,125	709	5	52	162	105	.302	.384	.965	1144	397.1	.407	147	366.5
4	Albert Belle A. Belle	.581	1,336	5,076	881	1,520	344	16	351	1,099	619	49	838	86	34	5,817	2,949	711	4	69	80	172	.299	.376	.957	1077	366.4	.406	145	339.6
5	Manny Ramirez M. Ramirez	.576	849	3,031	573	932	203	9	198	682	455	34	663	27	23	3,563	1,747	410	2	41	38	89	.307	.399	.975	690	240.3	.414	145	213.3
6	Juan Gonzalez J. Gonzalez	.576	1,224	4,771	785	1,412	279	19	339	1,068	338	48	930	21	15	5,215	2,746	637	0	58	63	125	.296	.345	.920	893	259.1	.390	133	219.1
7	Mike Piazza M. Piazza	.575	981	3,653	611	1,200	173	4	240	768	381	13	563	13	13	4,075	2,101	417	0	28	83	114	.328	.391	.966	770	261.1	.409	154	281.7
8	Frank Thomas F. Thomas	.573	1,371	4,892	968	1,564	317	10	301	1,040	1,076	41	741	28	18	6,091	2,804	628	0	82	133	152	.320	.440	1.013	1257	518.8	.433	166	505.9
9	Larry Walker L. Walker	.571	1,278	4,545	882	1,423	314	36	262	851	527	79	794	189	55	5,201	2,595	612	4	46	81	98	.313	.390	.961	980	353.8	.410	141	268
10	Vladimir Guerrero V. Guerrero	.567	418	1,585	256	498	96	14	92	281	116	21	199	28	20	1,732	898	202	0	10	29	45	.314	.367	.933	304	85.4	.393	135	78.6
11	Nomar Garciaparra N. Garciaparra	.566	455	1,907	347	615	125	26	96	340	123	22	207	53	18	2,074	1,080	247	3	19	10	40	.322	.367	.933	370	109.7	.397	135	95.1
12	Todd Helton T. Helton	.554	346	1,201	205	378	78	7	65	221	129	12	142	10	10	1,352	665	150	1	9	11	30	.315	.384	.938	246	74.2	.400	116	29.3
13	Alex Rodriguez A. Rodriguez	.551	642	2,572	493	791	160	11	148	463	210	24	495	118	32	2,843	1,417	319	16	21	4	53	.308	.363	.914	494	135.4	.391	132	121.2
14	Jim Thome J. Thome	.547	916	3,077	609	883	181	16	196	579	646	29	882	16	11	3,782	1,684	393	1	29	50	64	.287	.412	.959	724	251.1	.412	145	223.6
15	Jeff Bagwell J. Bagwell	.545	1,317	4,759	921	1,447	314	21	263	961	885	82	906	158	58	5,800	2,592	598	3	71	121	127	.304	.416	.961	1104	396.6	.412	158	421.2
16	Mo Vaughn M. Vaughn	.538	1,185	4,352	691	1,312	219	10	263	860	573	82	1,081	28	17	5,044	2,340	492	0	37	125	105	.301	.390	.928	892	270.8	.395	134	224.4
17	Brian Giles B. Giles	.534	440	1,378	259	407	81	7	78	272	250	7	219	32	10	1,660	736	166	4	21	21	37	.295	.401	.935	301	91.1	.400	136	79
18	Rafael Palmeiro R. Palmeiro	.534	1,526	5,848	965	1,747	343	23	328	1,068	707	47	792	67	29	6,681	3,120	694	11	68	93	132	.299	.375	.908	1144	337.3	.390	136	306.5
19	Edgar Martinez E. Martinez	.532	1,295	4,630	854	1,492	358	12	196	750	854	56	708	38	26	5,587	2,462	566	7	40	70	125	.322	.430	.962	1093	416.7	.419	155	388.1
20	Carlos Delgado C. Delgado	.531	667	2,332	378	622	157	6	149	467	313	46	624	5	5	2,719	1,238	312	0	28	35	44	.267	.361	.892	444	100.5	.378	124	84.5
21	Chipper Jones C. Jones	.529	779	2,890	542	871	166	17	153	524	459	3	463	83	19	3,386	1,530	336	3	31	28	80	.301	.394	.923	608	180.7	.397	140	174
22	Kevin Mitchell K. Mitchell	.529	675	2,280	351	664	123	8	134	441	275	16	367	10	12	2,597	1,205	265	0	26	44	58	.291	.368	.896	435	130.7	.387	140	124.9
23	Vinny Castilla V. Castilla	.528	956	3,516	518	1,049	166	17	203	611	223	27	521	22	32	3,805	1,858	386	6	33	38	104	.298	.342	.870	594	116.2	.370	101	3.2
24	Jose Canseco J. Canseco	.528	1,145	4,309	751	1,145	204	9	303	885	577	57	1,205	119	57	4,986	2,276	516	0	43	43	119	.266	.357	.885	817	216.3	.382	132	196.4
25	Ryan Klesko R. Klesko	.525	792	2,431	374	684	140	18	139	450	301	15	523	26	16	2,772	1,277	297	1	24	42	53	.281	.361	.886	448	98.7	.376	126	93.1