mlb worst record when allowing 1 run or less in one season

The Philadelphia Athletics have the worst record by a team with 1 or fewer run allowed in a season, with a record of 7-5 in 1919.

	TEAM	REC	R	SEASON	W%	G	W	L	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	Athletics	7-5	11	1919	.583	12	7	5	0.00	34	1	0	107.1	70	0	1	35	2		410	1	2.85	2.93	0.97	0.08	8.3	8.5	0.98	.204	0.92	5.87
2	Mets	14-8	17	1963	.636	22	14	8	0.69	105	5	2	197.0	133	15	6	30	4	1	735	5	4.80	1.37	3.50	0.27	14.3	4.1	0.83	.215	0.78	6.08
3	Reds	13-7	15	1916	.650	22	13	7	0.00	81	6	1	197.1	110	0	0	56	5		736	2	3.69	2.55	1.45	0.00	11.0	7.6	0.84	.185	0.68	5.02
4	Rockies	4-2	5	2020	.667	6	4	2	0.87	44	0	0	52.0	24	5	2	15	4	0	197	1	7.62	2.60	2.93	0.35	22.3	7.6	0.75	.167	0.87	4.15
5	Phillies	9-4	9	1941	.692	13	9	4	0.00	50	4	0	120.0	75	0	0	40	1		467	2	3.75	3.00	1.25	0.00	10.7	8.6	0.96	.199	0.68	5.63
6	Phillies	7-3	6	1945	.700	10	7	3	0.00	37	4	0	90.0	50	0	0	29	1		342	2	3.70	2.90	1.28	0.00	10.8	8.5	0.88	.182	0.60	5.00
7	Senators	14-6	16	1904	.700	23	14	6	0.00	98	7	1	212.0	145	0	0	43	8			2	4.16	1.83	2.28	0.00		5.5	0.89	.231	0.68	6.16
8	White Sox	17-7	15	1918	.708	24	17	7	0.00	68	9	0	225.1	142	0	0	50	3		845	3	2.72	2.00	1.36	0.00	8.0	5.9	0.85	.196	0.60	5.67
9	Cardinals	20-8	25	1918	.714	28	20	8	0.00	87	3	1	258.0	156	0	0	48	7		960	3	3.03	1.67	1.81	0.00	9.1	5.0	0.79	.191	0.87	5.44
10	Yankees	24-9	26	1914	.727	35	24	9	0.00	122	9	0	311.0	198	0	2	59	7		1,147	3	3.53	1.71	2.07	0.06	10.6	5.1	0.83	.205	0.75	5.73
11	Superbas	25-9	25	1913	.735	34	25	9	0.00	134	9	0	305.0	182	0	0	80	6		1,128	5	3.95	2.36	1.68	0.00	11.9	7.1	0.86	.200	0.74	5.37
12	Tigers	14-5	17	2018	.737	19	14	5	0.88	144	0	9	174.0	118	17	4	39	4	1	660	2	7.45	2.02	3.69	0.21	21.8	5.9	0.90	.243	0.88	6.10
13	Cardinals	14-5	13	1995	.737	19	14	5	0.64	85	2	8	168.2	112	12	3	40	4	2	634	4	4.54	2.13	2.13	0.16	13.4	6.3	0.90	.217	0.69	5.98
14	Rebels	17-6	16	1914	.739	25	17	6	0.00	86	9	0	238.1	146	0	1	62	1			3	3.25	2.34	1.39	0.04		7.6	0.87	.218	0.60	5.51
15	Cardinals	20-7	14	1908	.741	27	20	7	0.00	105	13	1	234.2	133	0	1	56	5		872	3	4.03	2.15	1.88	0.04	12.0	6.4	0.81	.187	0.54	5.10
16	Reds	12-4	13	2025	.750	16	12	4	0.70	122	0	5	142.0	76	11	4	35	6	1	530	5	7.73	2.22	3.49	0.25	23.0	6.6	0.78	.198	0.82	4.82
17	Giants	9-3	8	2025	.750	12	9	3	0.60	90	0	4	105.0	58	7	2	35	2	0	390	4	7.71	3.00	2.57	0.17	23.1	9.0	0.89	.215	0.69	4.97
18	Rockies	3-1	4	2025	.750	4	3	1	1.03	26	0	3	35.0	27	4	1	14	1	0	141	1	6.69	3.60	1.86	0.26	18.4	9.9	1.17	.263	1.03	6.94
19	Mariners	12-4	12	2019	.750	16	12	4	0.75	112	2	4	144.0	75	12	4	28	0	0	524	7	7.00	1.75	4.00	0.25	21.4	5.3	0.72	.187	0.75	4.69
20	Phillies	18-6	18	1960	.750	24	18	6	0.76	121	6	0	214.0	141	18	7	47	1	4	801	4	5.09	1.98	2.57	0.29	15.1	5.9	0.88	.214	0.76	5.93
21	Athletics	9-3	9	1956	.750	12	9	3	0.68	46	3	1	106.0	68	8	4	32	2	2	410	1	3.91	2.72	1.44	0.34	11.2	7.8	0.94	.196	0.76	5.77
22	Athletics	9-3	9	1950	.750	12	9	3	0.61	37	3	2	103.0	57	7	0	37	2		391	2	3.23	3.23	1.00	0.00	9.5	9.5	0.91	.181	0.79	4.98
23	Indians	21-7	23	1918	.750	28	21	7	0.00	67	5	0	249.2	160	0	0	55	4		941	4	2.42	1.98	1.22	0.00	7.1	5.8	0.86	.196	0.83	5.77
24	Cubs	30-10	23	1916	.750	40	30	10	0.00	161	17	1	360.2	213	0	2	51	9		1,324	7	4.02	1.27	3.16	0.05	12.2	3.9	0.73	.192	0.57	5.32
25	Pirates	31-10	34	1914	.756	44	31	10	0.00	137	10	1	406.1	248	0	1	77	4		1,496	3	3.03	1.71	1.78	0.02	9.2	5.1	0.80	.193	0.75	5.49