Gleyber Torres could set a Home Run record for most against a team in a season.

The St. Louis Browns moved to Baltimore and became the Orioles in 1954.

Terrible Baltimore pitching skews stats of Yankees Sanchez, Torres, Frazier, ... Friday, May 24, 2019
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Rk	I	Player	Split	Year	G	HR	GS	PA	AB	R	H	2B	3B	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
1		Gleyber Torres	Baltimore Orioles	2019	12	10	11	50	43	16	20	3	0	13	0	0	7	8	.465	.540	1.233	1.773	53	0	0	0	0	0	0	.400	290	299
2		Willie Stargell	Atlanta Braves	1971	12	11	12	54	44	21	19	1	0	20	0	0	10	15	.432	.537	1.205	1.742	53	0	0	0	0	1	0	.444	227	363
3		Sammy Sosa	Milwaukee Brewers	1998	12	12	12	54	45	18	17	0	0	18	3	0	9	11	.378	.481	1.178	1.659	53	2	0	0	0	2	0	.227	210	305

Gleyber Torres is already one of only three players to hit at least ten home runs against a team in a season in fewer than 50 AB. Torres had already played 12 of the 19 scheduled games between his Yankees and the Baltimore Orioles, whose pitchers are on pace to shatter any and all team records for home runs allowed, well over 300 home runs.

Ten home runs against one team has been done 143 times, including Torres, who might be joined in 2019 by teammate Gary Sanchez who has hit 9 home runs in 44 AB, also against Baltimore.

https://www.baseball-reference.com/tiny/EmX2M  Click that link to run a query for current data. It had a glitch, which was reported. It seems to be working today, although the trouble ticket was never closed. It had been including "WP lt .500 and WP of .500+" , which far exceeded any number against a single team and caused the query to be useless.

Remember that the NL through 1961 and the AL through 1960 played a 154 game schedule: 22 games against 7 opponents. So players then would tend to have more plate appearances against individual teams than they would today.

Most times hitting at least 10 home runs against a team:

Ruth 14    11 home runs four times, the rest 10

Gehrig 9    14 home runs, 12 twice, 11 three times

Mays 7 All before 1962 NL expansion; Dodgers 1954, 1955 (12), 1956, 1958 (12) (LA). 12 against Milwaukee Braves in 1961, including 4 in one game

Foxx/Williams 6

Most home runs:

Rk	I	Player	Split	Year	G	HR	GS	PA	AB	R	H	2B	3B	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
1		Lou Gehrig	Cleveland Indians	1936	23	14	23	110	95	31	36	6	2	36	0	1	15	8	.379	.464	.926	1.390	88		0	0		0	1	.301	130	256
2		Roger Maris	Chicago White Sox	1961	18	13	18	77	71	19	27	4	1	26	0	0	6	11	.380	.429	1.014	1.443	72	2	0	0	0	0	1	.298	179	280
3		Hank Sauer	Pittsburgh Pirates	1954	19	13	19	83	70	25	27	4	0	30	1	0	11	5	.386	.470	1.000	1.470	70	1	1	0	1	0	0	.264	203	263
4		Joe Adcock	Brooklyn Dodgers	1956	17	13	16	63	57	18	24	3	0	23	0	0	6	9	.421	.476	1.158	1.634	66	0	0	0	0	3	1	.314	234	345
5		Jimmie Foxx	Detroit Tigers	1932	22	13	22	102	86	27	28	2	0	29	0	2	16	17	.326	.431	.802	1.234	69		0	0		0	1	.268	99	230

Gehrig: 14 of 49: 28.6%
Sauer: 13 of 41: 31.7%
Adcock: 13 of 38: 34.2%

Most AB:

Rk	I	Player	Split	Year	G	HR	GS	PA	AB ▼	R	H	2B	3B	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
1		Joe DiMaggio	St. Louis Browns	1936	22	10	22	108	99	31	52	12	3	27	1	0	6	3	.525	.557	1.010	1.567	100		1	2		0	1	.488	234	260
2		Joe DiMaggio	St. Louis Browns	1937	23	11	23	112	98	27	34	4	1	31	0	0	13	7	.347	.429	.745	1.173	73		1	0		0	0	.288	115	164
3		Gus Zernial	St. Louis Browns	1950	22	11	22	103	97	18	37	2	1	30	0	1	5	16	.381	.417	.763	1.180	74	1	1	0		0	0	.371	184	189
4		Stan Musial	New York Giants	1948	22	11	22	105	96	22	30	5	1	19	0	0	8	7	.313	.365	.729	1.095	70	2	0	1		2	1	.244	84	194
5		Ted Williams	Detroit Tigers	1949	23	10	23	115	96	30	33	5	1	25	0	0	18	7	.344	.452	.729	1.181	70	3	1	0		0	0	.291	104	233
6		Joe Medwick	Philadelphia Phillies	1937	23	10	23	110	96	25	43	9	0	34	0	1	13	6	.448	.518	.854	1.372	82	2	1	0		3	1	.413	158	241
7		Lou Gehrig	Cleveland Indians	1936	23	14	23	110	95	31	36	6	2	36	0	1	15	8	.379	.464	.926	1.390	88		0	0		0	1	.301	130	256
8		Hank Aaron	Pittsburgh Pirates	1957	22	10	22	101	94	21	34	1	1	20	0	0	6	10	.362	.396	.713	1.109	67	3	0	0	1	1	2	.320	124	195
9		Lou Gehrig	Philadelphia Athletics	1927	23	10	23	110	92	26	39	9	2	32	1	1	13	14	.424	.500	.891	1.391	82		1	2		0	2	.426	122	27

DiMaggio four times, three against St. Louis Brown 1936, 1937, 1940; Cleveland 1948

Aaron only that one time: Pittsburgh 1957.

Barry Bonds 73 home runs in 2001: San Diego (11; 15%), Colorado (10; 13.7%).

Mark McGwire: none. 70 home runs in 1998; most against a team: 7 (Cubs, Marlins).

Babe Ruth 1927, 60 home runs:

I	Split	G	GS	PA	AB	R	H	2B	3B	HR ▼	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
	WP lt .500	88	88	396	303	91	110	19	4	35	89	4	2	85	49	.363	.503	.799	1.301	242		0	3		2	1	.342	107	240
	WP of .500+	63	63	295	237	67	82	10	4	25	76	3	3	52	41	.346	.464	.738	1.202	175		0	0		1	4	.333	91	231
	Boston Red Sox	22	22	105	87	31	34	6	0	11	30	2	0	16	13	.391	.485	.839	1.325	73		0	1		0	1	.365	109	229
	St. Louis Browns	22	22	98	73	25	27	2	1	9	27	0	0	21	10	.370	.511	.795	1.305	58		0	0		0	0	.333	108	223
	Cleveland Indians	22	22	94	70	18	26	7	0	9	19	0	0	23	13	.371	.527	.857	1.384	60		0	1		1	0	.354	119	263
	Philadelphia Athletics	19	19	88	72	22	23	2	0	9	21	0	0	14	13	.319	.430	.722	1.152	52		0	0		0	1	.280	82	209
	Detroit Tigers	22	22	105	83	19	27	6	1	8	29	2	1	19	12	.325	.451	.711	1.162	59		0	0		0	2	.302	85	198
	Washington Senators	22	22	102	82	26	32	2	3	8	26	1	2	19	16	.390	.505	.780	1.285	64		0	0		1	1	.414	105	249
	Chicago White Sox	22	22	99	73	17	23	4	3	6	13	2	2	25	13	.315	.490	.699	1.188	51		0	1		1	0	.315	91	220

Ruth hit 11 of 60 against Red Sox: 18%

Roger Maris 1961, 61 home runs:

I	Split	G	GS	PA	AB	R	H	2B	3B	HR ▼	RBI	SB	CS	BB	SO	BA	OBP	SLG	OPS	TB	GDP	HBP	SH	SF	IBB	ROE	BAbip	tOPS+	sOPS+
	WP lt .500	108	108	476	392	92	101	10	2	37	93	0	0	72	36	.258	.378	.577	.955	226	13	7	0	5	0	6	.198	95	153
	WP of .500+	53	52	222	198	40	58	6	2	24	48	0	0	22	31	.293	.360	.707	1.067	140	5	0	0	2	0	3	.234	111	196
	Chicago White Sox	18	18	77	71	19	27	4	1	13	26	0	0	6	11	.380	.429	1.014	1.443	72	2	0	0	0	0	1	.298	179	280
	Washington Senators	18	18	79	75	12	20	3	0	9	17	0	0	4	4	.267	.304	.667	.970	50	4	0	0	0	0	0	.177	89	156
	Cleveland Indians	18	18	78	61	16	20	0	0	8	19	0	0	12	7	.328	.436	.721	1.157	44	3	2	0	3	0	0	.245	134	212
	Detroit Tigers	18	18	82	74	16	20	2	1	8	16	0	0	8	12	.270	.341	.649	.990	48	2	0	0	0	0	2	.222	96	175
	Boston Red Sox	18	18	81	65	19	17	1	0	7	19	0	0	16	7	.262	.407	.600	1.007	39	0	0	0	0	0	1	.196	106	163
	Kansas City Athletics	18	18	78	67	18	17	3	1	5	11	0	0	8	5	.254	.359	.552	.911	37	3	3	0	0	0	1	.211	86	133
	Los Angeles Angels	18	18	78	59	15	16	0	1	4	11	0	0	18	5	.271	.436	.508	.944	30	1	0	0	1	0	1	.235	99	154
	Minnesota Twins	18	18	82	65	12	11	3	0	4	16	0	0	14	8	.169	.329	.400	.729	26	2	2	0	1	0	3	.130	53	100
	Baltimore Orioles	17	16	63	53	5	11	0	0	3	6	0	0	8	8	.208	.302	.377	.679	20	1	0	0	2	0	0	.182	42	112

Maris hit 13 of 61 against White Sox: 21.3%

Teams victimized most often:
Browns/Orioles 16: 13/3
Tigers 12
Athletics 11: Philadelphia 7, KC 3, Oakland 1
Dodgers 11: Brooklyn 7, LA 4
White Sox 10
Pirates 9
Indians 9