Most career Home Runs hit off one pitcher: Duke Snider off Robin Roberts. Really?

How did Google AI find Baseball Reference data that Baseball Reference could not?  Tuesday, June 2, 2026

AI Overview ...

• 19 Home Runs: Duke Snider against Robin Roberts
• 18 Home Runs: Willie Mays against Warren Spahn
• 17 Home Runs: Henry Aaron against Don Drysdale
• 17 Home Runs: Stan Musial against Warren Spahn
• 17 Home Runs: Babe Ruth against Rube Walberg

...

I checked each of the five and the numbers are correct. I could not check for a number higher than 19.

Home Run Log for Duke Snider:

https://www.baseball-reference.com/players/event_hr.fcgi?id=snidedu01&t=b

169 Pitchers

Robin Roberts	19
Murry Dickson	10
Bob Purkey	10
Warren Hacker	10
Herm Wehmeier	9

...

Did Google AI have a lucky guess?

______________________

Home Run Log for pitcher Robin Roberts:

209 Batters

Duke Snider	19
Ernie Banks	15
Eddie Mathews	13
Roy Campanella	13
Hank Sauer	12

https://www.baseball-reference.com/leaders/HR_p_career.shtml

Rank	Player (yrs, age)	Home Runs	IP	Throws	HR Log
1.	Jamie Moyer (25)	522	4074.0	L	HR Log
2.	Robin Roberts+ (19)	505	4688.2	R	HR Log
3.	Fergie Jenkins+ (19)	484	4500.2	R	HR Log
4.	Phil Niekro+ (24)	482	5404.0	R	HR Log
5.	Don Sutton+ (23)	472	5282.1	R	HR Log
6.	Frank Tanana (21)	448	4188.1	L	HR Log
7.	Bartolo Colón (21)	439	3461.2	R	HR Log
8.	Warren Spahn+ (21)	434	5243.2	L	HR Log
9.	Bert Blyleven+ (22)	430	4970.0	R	HR Log
10.	Tim Wakefield (19)	418	3226.1	R	HR Log

Note Roberts and Spahn.

Years ago I had dragged Home Run Log data out of baseball-reference.com for batters with at least 493 career Home Runs. I sliced and diced that data and posted here but finding things in blogger.com is beyond the ability of mere Artificial Intelligence (AI). I'll try finding it in the coming days.

Today I dug out a table I had created that also confirms three of the top five above. I updated it to add Miguel Cabrera and at the bottom Stan Musial and Duke Snider.

So it's possible that other batters have more career homers off individual pitchers ... but it's extremely unlikely, even more than the current answer being Duke Snider.

Below numbers 19, 18, 17, ... are the HR hit. The number in the matrix shows how many pitchers allowed that many HR to that batter. Pit#: total number pitchers who allowed HR to that batter.

	First	Last	HR	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	Pit#	Last
1	Barry	Bonds	762												5	3	1	10	15	39	93	282	448	Bonds
2	Hank	Aaron	755			1			1		1		3	3	6	6	11	8	25	25	64	156	310	Aaron
3	Babe	Ruth	714			1			1	3	1	2	5	6	6	5	8	18	9	30	38	83	216	Ruth
4	Alex	Rodriguez	696												4	1	3	14	11	28	80	281	422	Rodriguez
5	Willie	Mays	660		1			1		1	1	1	2	2	4	7	5	10	17	28	53	134	267	Mays
6	Albert	Pujols	656												1		1	8	15	39	67	291	422	Pujols
7	Ken	Griffey	630												1		2	6	12	36	74	276	407	Griffey
8	Jim	Thome	612											1	1	1	3	1	9	33	77	276	402	Thome
9	Sammy	Sosa	609													2	3	7	16	32	71	240	371	Sosa
10	Frank	Robinson	586										1	1	2	7	5	10	19	32	52	146	275	Robinson
11	Mark	McGwire	583													1	1	10	13	24	83	230	362	McGwire
12	Harmon	Killebrew	573											1	1	1	7	13	28	26	58	136	271	Killebrew
13	Rafael	Palmeiro	569											1		1	1	2	11	33	79	236	364	Palmeiro
14	Reggie	Jackson	563												1	2	5	8	12	35	75	168	306	Jackson
15	Manny	Ramirez	555										1	1	1		1	3	13	27	59	256	362	Ramirez
16	Mike	Schmidt	548									1	1	2	1	3	5	9	15	31	51	150	269	Schmidt
17	David	Ortiz	541														1	1	12	34	68	244	360	Ortiz
18	Mickey	Mantle	536							1	1	1		1	4	4	8	9	17	23	46	109	224	Mantle
19	Jimmie	Foxx	534				3		3	1		2	3	3		5	5	11	11	15	33	77	172	Foxx
20	Ted	Williams	521								1		2		3	2	10	11	14	20	59	102	224	Williams
20	Willie	McCovey	521								1			2	4	4	8	6	12	26	45	137	245	McCovey
20	Frank	Thomas	521											1		1	4	3	10	26	57	234	336	Thomas
23	Eddie	Mathews	512						1	1		3	1	4		5	5	8	13	28	35	95	199	Mathews
23	Ernie	Banks	512					1			1		1	2	2	5	9	5	12	27	47	104	216	Banks
25	Miguel	Cabrera	511													1	1	1	4	22	83	245	357	Cabrera
25	Mel	Ott	511							1	2	1	1	1	6	2	6	6	16	26	41	92	201	Ott
27	Gary	Sheffield	509														2	6	2	28	72	231	341	Sheffield
28	Eddie	Murray	504														3	6	12	23	56	227	327	Murray
29	Lou	Gehrig	493						2	1		1	1	5	4	3	4	10	17	19	35	64	166	Gehrig
29	Fred	McGriff	493															3	8	17	73	249	350	McGriff
32	Stan	Musial	475			1					1	3	2		1	1	4	10	11	17	46	117	214	Musial
59	Duke	Snider	407	1									3	3	1	5		8	9	16	41	82	169	Snider
				19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
				1	1	1	3	1	3	3	2	3	5	6	6	7	11	18	28	39	93	291	448	max
				1	1	1	3	1	1	1	1	1	1	1	1	1	1	1	2	15	33	64	166	min

 

(Pitchers*HR)/total HR as a percent of total HR:

Last	HR	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	Last
Bonds	762												5.25%	2.76%	0.79%	6.56%	7.87%	15.35%	24.41%	37.01%	Bonds
Aaron	755			2.25%			1.85%		1.59%		3.97%	3.58%	6.36%	5.56%	8.74%	5.30%	13.25%	9.93%	16.95%	20.66%	Aaron
Ruth	714			2.38%			1.96%	5.46%	1.68%	3.08%	7.00%	7.56%	6.72%	4.90%	6.72%	12.61%	5.04%	12.61%	10.64%	11.62%	Ruth
Rodriguez	696												4.60%	1.01%	2.59%	10.06%	6.32%	12.07%	22.99%	40.37%	Rodriguez
Mays	660		2.73%			2.27%		1.97%	1.82%	1.67%	3.03%	2.73%	4.85%	7.42%	4.55%	7.58%	10.30%	12.73%	16.06%	20.30%	Mays
Pujols	656												1.22%		0.91%	6.10%	9.15%	17.84%	20.43%	44.36%	Pujols
Griffey	630												1.27%		1.90%	4.76%	7.62%	17.14%	23.49%	43.81%	Griffey
Thome	612											1.47%	1.31%	1.14%	2.94%	0.82%	5.88%	16.18%	25.16%	45.10%	Thome
Sosa	609													2.30%	2.96%	5.75%	10.51%	15.76%	23.32%	39.41%	Sosa
Robinson	586										1.71%	1.54%	2.73%	8.36%	5.12%	8.53%	12.97%	16.38%	17.75%	24.91%	Robinson
McGwire	583													1.20%	1.03%	8.58%	8.92%	12.35%	28.47%	39.45%	McGwire
Killebrew	573											1.57%	1.40%	1.22%	7.33%	11.34%	19.55%	13.61%	20.24%	23.73%	Killebrew
Palmeiro	569											1.58%		1.23%	1.05%	1.76%	7.73%	17.40%	27.77%	41.48%	Palmeiro
Jackson	563												1.42%	2.49%	5.33%	7.10%	8.53%	18.65%	26.64%	29.84%	Jackson
Ramirez	555										1.80%	1.62%	1.44%		1.08%	2.70%	9.37%	14.59%	21.26%	46.13%	Ramirez
Schmidt	548									2.01%	1.82%	3.28%	1.46%	3.83%	5.47%	8.21%	10.95%	16.97%	18.61%	27.37%	Schmidt
Ortiz	541														1.11%	0.92%	8.87%	18.85%	25.14%	45.10%	Ortiz
Mantle	536							2.43%	2.24%	2.05%		1.68%	5.97%	5.22%	8.96%	8.40%	12.69%	12.87%	17.16%	20.34%	Mantle
Foxx	534				8.99%		7.87%	2.43%		4.12%	5.62%	5.06%		6.55%	5.62%	10.30%	8.24%	8.43%	12.36%	14.42%	Foxx
Williams	521								2.30%		3.84%		4.61%	2.69%	11.52%	10.56%	10.75%	11.52%	22.65%	19.58%	Williams
McCovey	521								2.30%			3.45%	6.14%	5.37%	9.21%	5.76%	9.21%	14.97%	17.27%	26.30%	McCovey
Thomas	521											1.73%		1.34%	4.61%	2.88%	7.68%	14.97%	21.88%	44.91%	Thomas
Mathews	512						2.73%	2.54%		6.45%	1.95%	7.03%		6.84%	5.86%	7.81%	10.16%	16.41%	13.67%	18.55%	Mathews
Banks	512					2.93%			2.34%		1.95%	3.52%	3.13%	6.84%	10.55%	4.88%	9.38%	15.82%	18.36%	20.31%	Banks
Cabrera	511													1.37%	1.17%	0.98%	3.13%	12.92%	32.49%	47.95%	Cabrera
Ott	511							2.54%	4.70%	2.15%	1.96%	1.76%	9.39%	2.74%	7.05%	5.87%	12.52%	15.26%	16.05%	18.00%	Ott
Sheffield	509														2.36%	5.89%	1.57%	16.50%	28.29%	45.38%	Sheffield
Murray	504														3.57%	5.95%	9.52%	13.69%	22.22%	45.04%	Murray
Gehrig	493						5.68%	2.64%		2.23%	2.03%	9.13%	6.49%	4.26%	4.87%	10.14%	13.79%	11.56%	14.20%	12.98%	Gehrig
McGriff	493															3.04%	6.49%	10.34%	29.61%	50.51%	McGriff
Musial	475			3.58%					2.53%	6.95%	4.21%		1.68%	1.47%	5.05%	10.53%	9.26%	10.74%	19.37%	24.63%	Musial
Snider	407	4.67%									7.37%	6.63%	1.97%	8.60%		9.83%	8.85%	11.79%	20.15%	20.15%	Snider
		19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
max		4.67%	2.73%	3.58%	8.99%	2.93%	7.87%	5.46%	4.70%	6.95%	7.37%	9.13%	9.39%	8.60%	11.52%	12.61%	19.55%	18.85%	32.49%	50.51%	max
min		4.67%	2.73%	2.25%	8.99%	2.27%	1.85%	1.97%	1.59%	1.67%	1.71%	1.47%	1.22%	1.01%	0.79%	0.82%	1.57%	8.43%	10.64%	11.62%	min

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Somewhat related and also of interest:

Most career Home Runs HIT by pitchers as pitchers ... including Ruth and Ohtani.  Monday, June 8, 2026

27 pitchers allowed Home Runs to 3 of 4 Yankees Mount Rushmore: Ruth, Gehrig, DiMaggio, Mantle.  Friday, May 29, 2026