Hank Aaron launched the most homers by a player in his 20th season, with 40 home runs.

	NAME	HR	SEASON	TM	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	Hank Aaron H. Aaron	40	1973	ATL	120	392	84	118	12	1	96	68	1	51	1	1	465	252	53	0	4	13	7	.301	.402	.643	1.045	97	46	.449	176	40.8
2	David Ortiz D. Ortiz	38	2016	BOS	151	537	79	169	48	1	127	80	2	86	2	0	626	333	87	0	7	15	22	.315	.401	.620	1.021	126	52.2	.419	163	47.1
3	Babe Ruth B. Ruth	34	1933	NYY	137	459	97	138	21	3	104	114	2	90	4	5	575	267	58	0				.301	.442	.582	1.023	125	58.3	.462	168	52.3
4	Jim Thome J. Thome	25	2010	MIN	108	276	48	78	16	2	59	60	2	82	0	0	340	173	43	0	2	4	8	.283	.412	.627	1.039	71	32	.439	177	30.6
5	Gary Sheffield G. Sheffield	25	2007	DET	133	494	107	131	20	1	75	84	9	71	22	5	593	228	46	0	6	2	10	.265	.378	.462	.839	92	18.6	.368	123	16.8
6	Harold Baines H. Baines	25	1999	TOT	135	430	62	134	18	1	103	54	0	48	1	2	486	229	44	0	2	3	16	.312	.387	.533	.919	86	23.1	.396	135	22.7
7	Eddie Murray E. Murray	22	1996	TOT	152	566	69	147	21	1	79	61	0	87	4	0	637	236	44	0	10	6	19	.260	.327	.417	.743	75	-6.9	.323	85	-13.3
8	Darrell Evans D. Evans	22	1988	DET	144	437	48	91	9	0	64	84	1	89	1	4	522	166	31	0	0	4	14	.208	.337	.380	.717	64	6.7	.329	108	4.9
9	Dave Winfield D. Winfield	21	1993	MIN	143	547	72	148	27	2	76	45	0	106	2	3	594	242	50	0	2	2	15	.271	.325	.442	.767	77	5.8	.339	103	2.3
10	Mel Ott M. Ott	21	1945	NYG	135	451	73	139	23	0	79	71	8	41	1		532	225	44	2			6	.308	.411	.499	.910	97	38.8	.430	149	31.5
11	Ron Fairly R. Fairly	19	1977	TOR	132	458	60	128	24	2	64	58	2	58	0	4	528	213	45	8	2	11	12	.279	.362	.465	.827	77	15.2	.360	119	11.7
12	Ken Griffey Jr. K. Griffey Jr.	18	2008	TOT	143	490	67	122	30	1	71	78	3	89	0	1	575	208	49	0	4	14	13	.249	.353	.424	.778	73	3.9	.336	99	-1
13	Rafael Palmeiro R. Palmeiro	18	2005	BAL	110	369	47	98	13	0	60	43	2	43	2	0	422	165	31	0	8	4	9	.266	.339	.447	.786	55	4.1	.338	107	3.6
14	Reggie Jackson R. Jackson	18	1986	CAL	132	419	65	101	12	2	58	92	3	115	1	1	517	171	32	0	3	11	14	.241	.379	.408	.787	72	12.8	.352	118	11
15	Willie Mays W. Mays	18	1971	SFG	136	417	82	113	24	5	61	112	3	123	23	3	537	201	47	1	4	11	8	.271	.425	.482	.907	93	37.8	.406	158	34
16	Adrian Beltre A. Beltre	17	2017	TEX	94	340	47	106	22	1	71	39	4	52	1	0	389	181	40	0	6	2	7	.312	.383	.532	.915	68	20.8	.384	133	15.9
17	Graig Nettles G. Nettles	16	1986	SDP	126	354	36	77	9	0	55	41	2	62	0	1	400	134	25	0	3	8	6	.218	.300	.379	.679	39	-7.2	.298	86	-6.6
18	Cal Ripken Jr. C. Ripken Jr.	15	2000	BAL	83	309	43	79	16	0	56	23	3	37	0	0	339	140	31	0	4	0	10	.256	.310	.453	.763	41	-3.8	.328	92	-3.5
19	Carl Yastrzemski C. Yastrzemski	15	1980	BOS	105	364	49	100	21	1	50	44	0	38	0	2	412	168	37	1	3	5	9	.275	.350	.462	.812	59	12.4	.359	115	7.3
20	Stan Musial S. Musial	15	1961	STL	123	372	46	107	22	4	70	52	1	35	0	0	431	182	41	0	6	17	7	.288	.371	.489	.860	65	14.1	.365	113	7
21	Carlos Beltran C. Beltran	14	2017	HOU	129	467	60	108	29	0	51	33	3	102	0	0	509	179	43	0	6	3	9	.231	.283	.383	.666	46	-16.1	.283	76	-15
22	Rickey Henderson R. Henderson	14	1998	OAK	152	542	101	128	16	1	57	118	5	114	66	13	670	188	31	2	3	0	5	.236	.376	.347	.723	86	2.8	.336	100	-0.3
23	Joe Morgan J. Morgan	14	1982	SFG	134	463	68	134	19	4	61	85	2	60	24	4	554	203	37	1	3	4	3	.289	.400	.438	.838	88	25.4	.378	143	26.7
24	Carlton Fisk C. Fisk	13	1989	CWS	103	375	47	110	25	2	68	36	3	60	1	0	419	178	40	0	5	8	15	.293	.356	.475	.830	62	16.2	.365	129	14
25	Willie McCovey W. McCovey	12	1978	SFG	108	351	32	80	19	2	64	36	0	57	1	0	389	139	33	0	2	8	12	.228	.298	.396	.694	39	-3.1	.307	92	-3.5