The New York Giants allowed their most runs in a game on August 15, 1895 and on June 1, 1895, with 23 runs.

Interpreted as:

most runs allowed regular-season game by sf giants

	TEAM	R	DATE	TM		OPP	RESULT	ERA	SO	SHO	SV	IP	H	ER	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Giants	23	8/15/1895	NYG	@	PHI	L 9-23
2	Giants	23	6/1/1895	NYG	vs	STL	L 2-23
3	Giants	21	8/2/1948	NYG	vs	SLN	L 5-21	0.00	0	0	0	9.0	20	0	4	10	1		59	0	0.00	10.00	0.00	4.00	0.0	16.9	3.33	.364	21.00	20.00
4	Giants	21	8/6/1894	NYG	vs	BKN	L 8-21
5	Giants	21	7/7/1886	NYG	@	CWS	L 9-21
6	Giants	20	9/18/2006	SFG	@	COL	L 8-20	22.50	7	0	0	8.0	19	20	4	7	1	0	51	0	7.88	7.88	1.00	4.50	13.7	13.7	3.25	.469	22.50	21.38
7	Giants	20	8/13/1959	SFG	@	CHC	L 9-20	22.50	2	0	0	8.0	19	20	5	13	1	4	56	2	2.25	14.62	0.15	5.63	3.6	23.2	4.00	.400	22.50	21.38
8	Giants	20	8/22/1907	NYG	vs	PIT	L 5-20	0.00	5	0	0	8.0	22	0	0	9	1		50	0	5.63	10.13	0.56	0.00	10.0	18.0	3.88	.629	22.50	24.75
9	Giants	20	8/11/1894	NYG	@	BAL	L 1-20
10	Giants	20	6/3/1890	NYN	vs	BKN	L 7-20
11	Giants	19	5/7/1997	SFG	vs	MON	L 3-19	18.00	5	0	0	9.0	26	18	4	2	1	1	57	1	5.00	2.00	2.50	4.00	8.8	3.5	3.11	.489	19.00	26.00
12	Giants	19	5/26/1970	SFG	vs	LAD	L 3-19	17.00	5	0	0	9.0	20	17	1	3	2	0	51	0	5.00	3.00	1.67	1.00	9.8	5.9	2.56	.475	19.00	20.00
13	Giants	19	6/30/1951	NYG	@	BSN	L 7-19	18.00	5	0	0	8.0	18	16	3	6	1	0	50	1	5.63	6.75	0.83	3.38	10.0	12.0	3.00	.429	21.38	20.25
14	Giants	19	5/18/1946	NYG	vs	CHC	L 3-19	0.00	5	0	0	9.0	18	0	2	9	1		54	0	5.00	9.00	0.56	2.00	9.3	16.7	3.00	.432	19.00	18.00
15	Giants	19	7/4/1945	NYG	vs	SLN	L 2-19	0.00	4	0	0	9.0	20	0	2	7	1		53	0	4.00	7.00	0.57	2.00	7.5	13.2	3.00	.462	19.00	20.00
16	Giants	19	4/29/1930	NYG	vs	BKN	L 15-19	0.00	6	0	0	9.0	22	0	1	6	0		55	0	6.00	6.00	1.00	1.00	10.9	10.9	3.11	.500	19.00	22.00
17	Giants	19	6/7/1906	NYG	vs	CHC	L 0-19	0.00	3	0	0	9.0	23	0	1	8	0		56	0	3.00	8.00	0.38	1.00	5.4	14.3	3.44	.500	19.00	23.00
18	Giants	19	4/28/1900	NYG	@	PHI	L 1-19
19	Giants	19	4/23/1896	NYG	vs	PHI	L 8-19
20	Giants	19	6/17/1887	NYG	@	BSN	L 9-19
21	Gothams	19	5/24/1884	NYG	vs	PRO	L 5-19
22	Giants	18	5/24/2019	SFG	vs	ARI	L 2-18	14.00	12	0	0	9.0	21	14	4	3	3	0	55	0	12.00	3.00	4.00	4.00	21.8	5.5	2.67	.515	18.00	21.00
23	Giants	18	7/7/1971	SFG	vs	HOU	L 4-18	13.00	5	0	0	9.0	17	13	0	4	1	0	51	2	5.00	4.00	1.25	0.00	9.8	7.8	2.33	.415	18.00	17.00
24	Giants	18	7/19/1950	NYG	@	SLN	L 4-18	16.88	1	0	0	8.0	17	15	4	4	1	0	45	1	1.13	4.50	0.25	4.50	2.2	8.9	2.63	.371	20.25	19.13
25	Giants	18	6/6/1943	NYG	@	PIT	L 1-18	0.00	3	0	0	8.0	18	0	1	7	0		47	0	3.38	7.88	0.43	1.13	6.4	14.9	3.13	.472	20.25	20.25