The Chicago Cubs had the most runs by an NL team in a loss in 1931, with 13 runs against the Cardinals on July 12, 1931.

Interpreted as:

most runs by an nl team in a regular-season loss in 1931

	TEAM	R	L	DATE	TM		OPP	RESULT	W	L%	AB	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Cubs	13	1	7/12/1931	CHC	@	SLN	L 13-17	0	1.000	42	16	10	0	1	9	5	0	11	0	0	49	29	11	2	.381	.447	.690	1.137
2	Robins	10	1	9/21/1931	BKN	@	SLN	L 10-11	0	1.000	42	13	2	2	0	10	3	0	11	1	0	45	19	4	0	.310	.356	.452	.808
3	Giants	10	1	6/30/1931	NYG	vs	SLN	L 10-11	0	1.000	46	18	1	0	2	9	2	0	2	0	0	48	25	3	0	.391	.417	.543	.960
4	Cubs	10	1	6/29/1931	CHC	@	PHN	L 10-11	0	1.000	43	15	4	1	0	9	7	0	5	0	0	51	21	5	1	.349	.440	.488	.928
5	Giants	10	1	6/24/1931	NYG	vs	CHC	L 10-14	0	1.000	38	12	1	0	2	10	5	0	7	0	0	44	19	3	1	.316	.395	.500	.895
6	Reds	9	1	6/7/1931	CIN	vs	BSN	L 9-10	0	1.000	37	12	2	0	0	9	4	1	3	0	0	43	14	2	1	.324	.405	.378	.783
7	Reds	9	1	5/29/1931	CIN	@	SLN	L 9-14	0	1.000	42	16	3	1	0	9	1	0	5	1	0	43	21	4	0	.381	.395	.500	.895
8	Pirates	9	1	5/26/1931	PIT	@	SLN	L 9-11	0	1.000	39	14	2	0	0	7	7	0	3	1	0	48	16	2	2	.359	.457	.410	.867
9	Phillies	8	1	7/16/1931	PHN	@	PIT	L 8-12	0	1.000	37	11	3	0	0	7	2	0	1	0	0	39	14	3	0	.297	.333	.378	.712
10	Cardinals	8	1	7/4/1931	SLN	@	PIT	L 8-9	0	1.000	47	13	1	1	0	8	8	0	2	1	0	55	16	2	0	.277	.382	.340	.722
11	Robins	8	1	6/3/1931	BKN	@	CHC	L 8-9	0	1.000	39	14	4	0	1	8	5	0	3	0	0	46	21	5	2	.359	.432	.538	.970
12	Giants	8	1	5/30/1931	NYG	vs	BKN	L 8-18	0	1.000	38	12	4	1	0	8	0	0	0	0	0	38	18	5	0	.316	.316	.474	.789
13	Cardinals	8	1	5/28/1931	SLN	vs	PIT	L 8-11	0	1.000	33	13	4	1	1	8	1	0	0	0	0	35	22	6	1	.394	.412	.667	1.078
14	Braves	8	1	4/28/1931	BSN	@	PHN	L 8-9	0	1.000	36	11	5	0	0	8	5	0	0	2	0	42	16	5	1	.306	.390	.444	.835
15	Cubs	7	1	9/21/1931	CHC	vs	NYG	L 7-15	0	1.000	35	10	2	0	1	5	9	0	7	0	0	45	15	3	1	.286	.432	.429	.860
16	Braves	7	1	9/16/1931	BSN	@	CHC	L 7-8	0	1.000	34	13	2	0	0	6	3	0	4	1	0	41	15	2	4	.382	.432	.441	.874
17	Braves	7	1	9/13/1931	BSN	@	CHC	L 7-11	0	1.000	46	14	3	1	0	6	2	0	3	1	0	49	19	4	1	.304	.333	.413	.746
18	Reds	7	1	8/16/1931	CIN	@	BKN	L 7-8	0	1.000	39	11	2	1	0	7	0	0	4	0	0	39	15	3	0	.282	.282	.385	.667
19	Cubs	7	1	8/8/1931	CHC	@	SLN	L 7-14	0	1.000	39	12	3	0	1	7	3	0	8	1	0	42	18	4	0	.308	.357	.462	.819
20	Robins	7	1	7/24/1931	BKN	@	PIT	L 7-8	0	1.000	42	21	4	1	1	7	3	1	2	0	0	46	30	6	0	.500	.543	.714	1.258
21	Pirates	7	1	7/12/1931	PIT	@	CIN	L 7-14	0	1.000	40	14	2	1	0	7	3	0	1	0	0	43	18	3	0	.350	.395	.450	.845
22	Robins	7	1	6/19/1931	BKN	vs	CHC	L 7-12	0	1.000	37	11	3	1	1	7	3	0	2	0	0	40	19	5	0	.297	.350	.514	.864
23	Braves	7	1	6/16/1931	BSN	@	CHC	L 7-8	0	1.000	37	10	2	1	0	7	3	1	5	1	0	41	14	3	0	.270	.341	.378	.720
24	Giants	7	1	6/5/1931	NYG	@	SLN	L 7-8	0	1.000	42	11	1	2	0	7	5	0	5	1	0	47	16	3	0	.262	.340	.381	.721
25	Braves	7	1	5/24/1931	BSN	vs	NYG	L 7-10	0	1.000	41	15	3	1	1	7	0	0	4	0	0	41	23	5	0	.366	.366	.561	.927