Babe Ruth had the highest slugging percentage by a player in his first 8 seasons, with a slugging percentage of .700.

Interpreted as:

highest MLB slg with a minimum of 1.55 PA per team game by a player through 8 seasons

	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	Babe Ruth B. Ruth	.700	685	2,108	537	718	162	55	162	527	485	15	345	44		2,636	1,476	379	28				.341	.467	1.167	667	377.9	.523	206	350.5
2	Ted Williams T. Williams	.642	1,184	4,221	1,082	1,488	314	56	265	1,038	1,101	21	376	16		5,348	2,709	635	5			99	.353	.488	1.130	1317	701.2	.508	192	614.4
3	Lou Gehrig L. Gehrig	.639	921	3,327	774	1,139	248	89	187	808	581	18	414	42		4,024	2,126	524	98				.342	.443	1.082	937	421.7	.476	175	411.4
4	Jimmie Foxx J. Foxx	.625	810	2,750	612	923	159	57	174	667	460	5	377	29		3,268	1,718	390	53				.336	.432	1.056	741	319.5	.464	164	288.6
5	Albert Pujols A. Pujols	.624	1,239	4,578	947	1,531	342	13	319	977	696	60	506	45	26	5,382	2,856	674	1	47	154	157	.334	.425	1.049	1143	483.2	.435	168	468.8
6	Hank Greenberg H. Greenberg	.617	882	3,358	698	1,086	262	53	206	851	517	11	556	43		3,917	2,072	521	31			8	.323	.415	1.032	852	365.8	.457	152	291.9
7	Todd Helton T. Helton	.616	1,135	4,051	832	1,372	328	22	251	836	667	31	542	30	23	4,798	2,497	601	2	47	109	97	.339	.432	1.048	1031	430.6	.438	147	291.2
8	Chuck Klein C. Klein	.605	1,057	4,236	848	1,467	287	56	232	880	385	11	347	58		4,677	2,562	575	45				.346	.402	1.007	985	391.1	.445	150	312.5
9	Frank Thomas F. Thomas	.600	1,076	3,821	785	1,261	246	8	257	854	879	26	582	18	15	4,789	2,294	511	0	63	118	123	.330	.452	1.053	1043	469.9	.448	177	461.5
10	Al Simmons A. Simmons	.596	1,086	4,349	816	1,580	315	89	173	1,006	292	13	327	61		4,752	2,592	577	98				.363	.405	1.001	985	380	.445	150	326
11	Joe DiMaggio J. DiMaggio	.596	1,111	4,481	939	1,495	263	90	244	1,025	463	26	220	26		4,984	2,670	597	14			55	.334	.399	.995	1017	422.6	.445	154	361.8
12	Manny Ramirez M. Ramirez	.592	967	3,470	665	1,086	237	11	236	804	541	37	780	28	24	4,095	2,053	484	2	45	47	98	.313	.407	.998	822	303.3	.422	150	271.8
13	Willie Mays W. Mays	.590	1,065	4,074	777	1,291	204	79	250	709	505	14	435	179	53	4,629	2,403	533	1	35	69	89	.317	.391	.981	887	358.3	.424	155	317.8
14	Vladimir Guerrero V. Guerrero	.588	1,004	3,763	641	1,215	226	34	234	702	381	50	484	123	71	4,220	2,211	494	0	26	130	122	.323	.390	.978	793	264.9	.406	143	236
15	Johnny Mize J. Mize	.587	1,097	4,039	713	1,340	261	76	206	833	546	30	344	20		4,634	2,371	543	19			40	.332	.415	1.002	964	410.5	.450	170	391.5
16	Aaron Judge A. Judge	.586	835	3,005	614	846	137	4	257	572	560	24	1,038	43	16	3,613	1,762	398	0	24	48	78	.282	.396	.982	711	277.2	.409	165	279
17	Hack Wilson H. Wilson	.586	910	3,332	676	1,072	189	56	193	795	465	19	472	42		3,911	1,952	438	95				.322	.408	.994	799	300.3	.441	151	273.8
18	Albert Belle A. Belle	.580	913	3,441	592	1,014	223	16	242	751	396	37	622	61	25	3,922	1,995	481	4	44	49	114	.295	.369	.949	721	252.6	.404	145	226.9
19	Shohei Ohtani S. Ohtani	.580	932	3,406	635	963	179	41	250	610	477	24	1,002	156	41	3,927	1,974	470	0	20	77	43	.283	.373	.952	729	261	.396	155	256.1
20	Stan Musial S. Musial	.578	1,072	4,133	815	1,432	302	108	146	706	565	21	199	44		4,747	2,388	556	28			82	.346	.428	1.005	976	451.5	.460	174	410.1
21	Mickey Mantle M. Mantle	.577	1,102	3,937	890	1,238	185	50	249	766	799	7	773	77	22	4,770	2,270	484	11	16	48	37	.314	.430	1.006	974	428.8	.442	174	426.8
22	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
23	Mike Trout M. Trout	.573	1,065	3,870	793	1,187	224	44	240	648	693	65	998	189	34	4,672	2,219	508	0	44	86	52	.307	.416	.990	916	383.7	.417	171	389.1
24	Yordan Alvarez Y. Alvarez	.573	658	2,390	419	704	152	6	167	484	334	40	554	9	1	2,789	1,369	325	0	25	40	59	.295	.387	.959	532	198.9	.401	162	205
25	Alex Rodriguez A. Rodriguez	.571	952	3,758	760	1,167	228	14	241	730	385	47	747	151	39	4,247	2,146	483	16	41	15	80	.311	.378	.949	786	248.5	.403	141	228.8