most homers by a player in under 20 years

Sammy Sosa smashed the most home runs when playing <20 seasons, with 609 home runs.

	NAME	HR	SEAS	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Sammy Sosa S. Sosa	609	18	2,354	8,813	1,475	2,408	379	45	1,667	929	59	2,306	234	107	9,896	4,704	1,033	17	78	154	202	.273	.344	.534	.878	1559	345.1	.370	124	307.3
2	Mark McGwire M. McGwire	583	16	1,874	6,187	1,167	1,626	252	6	1,414	1,317	75	1,596	12	8	7,660	3,639	841	3	78	150	147	.263	.394	.588	.982	1480	564.9	.415	157	558.2
3	Manny Ramirez M. Ramirez	555	19	2,302	8,244	1,544	2,574	547	20	1,831	1,329	109	1,813	38	33	9,774	4,826	1,122	2	90	216	243	.312	.411	.585	.996	1931	719.5	.418	153	658.7
4	Mike Schmidt M. Schmidt	548	18	2,404	8,352	1,506	2,234	408	59	1,595	1,507	79	1,883	174	92	10,062	4,404	1,015	16	108	201	156	.267	.380	.527	.908	1717	591	.395	147	539.8
5	Mickey Mantle M. Mantle	536	18	2,401	8,102	1,676	2,415	344	72	1,509	1,733	13	1,710	153	38	9,909	4,511	952	14	47	126	113	.298	.421	.557	.977	1941	840	.428	170	821.8
6	Frank Thomas F. Thomas	521	19	2,322	8,199	1,494	2,468	495	12	1,704	1,667	87	1,397	32	23	10,074	4,550	1,028	0	121	168	226	.301	.419	.555	.974	1954	721.1	.416	154	692
7	Ted Williams T. Williams	521	19	2,292	7,706	1,798	2,654	525	71	1,839	2,021	39	709	24	4	9,791	4,884	1,117	5	20	86	197	.344	.482	.634	1.116	2349	1,219.7	.493	188	1,067
8	Ernie Banks E. Banks	512	19	2,528	9,421	1,305	2,583	407	90	1,636	763	70	1,236	50	53	10,395	4,706	1,009	45	96	198	229	.274	.330	.500	.830	1496	354.6	.359	118	228.9
9	Eddie Mathews E. Mathews	512	17	2,391	8,537	1,509	2,315	354	72	1,453	1,444	26	1,487	68	39	10,101	4,349	938	36	58	107	123	.271	.376	.509	.885	1685	557.5	.389	143	531.2
10	Fred McGriff F. McGriff	493	19	2,460	8,757	1,349	2,490	441	24	1,550	1,305	39	1,882	72	38	10,174	4,458	958	2	71	171	226	.284	.377	.509	.886	1678	454.1	.383	134	415.9
11	Lou Gehrig L. Gehrig	493	17	2,164	8,001	1,888	2,721	534	163	1,995	1,508	45	790	102		9,660	5,060	1,190	106			2	.340	.447	.632	1.080	2265	1,046.8	.477	173	980
12	Carlos Delgado C. Delgado	473	17	2,035	7,283	1,241	2,038	483	18	1,512	1,109	172	1,745	14	8	8,657	3,976	974	0	93	186	152	.280	.383	.546	.929	1513	435.7	.391	135	394
13	Chipper Jones C. Jones	468	19	2,499	8,984	1,619	2,726	549	38	1,623	1,512	18	1,409	150	46	10,614	4,755	1,055	3	97	177	253	.303	.401	.529	.930	1904	598.1	.397	141	563
14	Nelson Cruz N. Cruz	464	19	2,055	7,501	1,090	2,053	372	15	1,325	738	86	1,916	84	32	8,387	3,847	851	2	60	78	179	.274	.343	.513	.856	1294	313.6	.363	129	286.2
15	Adam Dunn A. Dunn	462	14	2,001	6,883	1,097	1,631	334	10	1,168	1,317	86	2,379	63	25	8,328	3,371	806	2	40	122	100	.237	.364	.490	.854	1285	297.9	.367	123	240
16	Jose Canseco J. Canseco	462	17	1,887	7,057	1,186	1,877	340	14	1,407	906	84	1,942	200	88	8,129	3,631	816	1	81	63	178	.266	.353	.515	.867	1293	321.2	.375	130	300.8
17	Vladimir Guerrero V. Guerrero	449	16	2,147	8,155	1,328	2,590	477	46	1,496	737	103	985	181	94	9,059	4,506	972	0	64	250	277	.318	.379	.553	.931	1575	464.6	.390	136	419
18	Jeff Bagwell J. Bagwell	449	15	2,150	7,797	1,517	2,314	488	32	1,529	1,401	128	1,558	202	78	9,431	4,213	969	3	102	155	221	.297	.408	.540	.948	1755	596.6	.405	149	588.3
19	Dave Kingman D. Kingman	442	16	1,941	6,677	901	1,575	240	25	1,210	608	53	1,816	85	49	7,429	3,191	707	16	75	72	139	.236	.302	.478	.780	960	139.8	.343	113	108.5
20	Paul Konerko P. Konerko	439	18	2,349	8,393	1,162	2,340	410	8	1,412	921	104	1,391	9	4	9,505	4,083	857	1	86	80	282	.279	.354	.486	.841	1420	273.3	.361	118	214.1
21	Andruw Jones A. Jones	434	17	2,196	7,599	1,204	1,933	383	36	1,289	891	97	1,748	152	59	8,664	3,690	853	6	71	69	192	.254	.337	.486	.823	1229	161.4	.352	111	122.2
22	Juan Gonzalez J. Gonzalez	434	17	1,689	6,556	1,061	1,936	388	25	1,404	457	62	1,273	26	19	7,155	3,676	847	2	78	74	184	.295	.343	.561	.904	1190	314.6	.383	129	264.9
23	Giancarlo Stanton G. Stanton	429	15	1,649	6,025	907	1,551	305	11	1,103	776	53	1,963	42	15	6,893	3,165	745	0	39	88	153	.257	.345	.525	.871	1093	294.9	.368	135	288.9
24	Mike Piazza M. Piazza	427	16	1,912	6,911	1,048	2,127	344	8	1,335	759	30	1,113	17	20	7,745	3,768	779	0	45	146	229	.308	.377	.545	.922	1347	382.3	.390	140	402.2
25	Billy Williams B. Williams	426	18	2,488	9,350	1,410	2,711	434	88	1,475	1,045	43	1,046	90	49	10,519	4,599	948	8	73	182	200	.290	.361	.492	.853	1630	511.5	.376	132	377.3