The Chicago Cubs have the highest winning percentage by a team with exactly 1 run in a season, winning 60.0 percent of the time in 1906.

	TEAM	W%	R	SEASON	W	L	G	AB	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Cubs	.600	16	1906	9	6	16	485	96	12	0	0		36	5	50	24		550	108	12	24				.198	.260	.223	.483
2	Mets	.529	17	1969	9	8	17	549	89	10	2	3	16	59	4	137	6	4	624	112	15	12	0	6	12	.162	.248	.204	.452
3	Braves	.500	6	1960	3	3	6	184	36	5	0	0	6	8	0	37	2	1	194	41	5	1	1	2	6	.196	.228	.223	.451
4	Reds	.500	14	1910	7	7	14	459	96	8	3	0		44	0	59	17		515	110	11	12				.209	.278	.240	.518
5	Cubs	.444	18	1907	8	10	18	536	100	14	5	0		32	4	50	11		589	124	19	17				.187	.238	.231	.469
6	Cubs	.438	16	1918	7	9	16	495	97	20	3	0	14	28	0	37	9		539	123	23	16				.196	.239	.248	.487
7	Athletics	.429	21	1909	9	12	21	654	116	17	5	1	17	46	5		16		720	146	23	15				.177	.237	.223	.460
8	Red Sox	.421	19	1918	8	11	19	593	102	17	4	1	15	57	1	58	12		673	130	22	22				.172	.246	.219	.465
9	Orioles	.417	12	1965	5	7	12	384	61	16	2	0	11	38	2	76	1	2	432	81	18	7	1	7	10	.159	.238	.211	.449
10	Pirates	.417	24	1908	10	14	24	742	129	20	8	2		58	7	61	20		831	171	30	24				.174	.240	.230	.471
11	Senators	.412	18	1918	7	10	18	617	109	11	1	1	14	38	4	45	11		675	125	13	16				.177	.229	.203	.432
12	Senators	.407	27	1914	11	16	27	815	141	18	7	1	25	71	3	110	26		916	176	26	27				.173	.242	.216	.458
13	Rockies	.400	5	2018	2	3	5	151	26	6	0	3	5	11	3	52	2	1	167	41	9	2	0	3	3	.172	.242	.272	.514
14	Cardinals	.400	20	1968	8	12	20	629	116	12	5	5	19	33	2	105	9	5	668	153	22	4	0	1	13	.184	.227	.243	.471
15	Giants	.400	10	1954	4	6	10	331	68	9	2	3	9	26	1	43	2	1	360	90	14	2	0		6	.205	.265	.272	.537
16	Cardinals	.400	16	1943	6	9	16	500	110	13	7	1	15	30	1	41	2		542	140	21	11			15	.220	.266	.280	.546
17	Yankees	.400	5	1929	2	3	5	154	33	5	1	1	4	5	1	17	1		164	43	7	4				.214	.244	.279	.523
18	Braves	.400	17	1914	6	9	17	529	95	18	0	1	14	43	6	77	3		597	116	19	19				.180	.249	.219	.468
19	Cubs	.400	15	1905	6	9	15	460	86	10	2	0		33	6	51	16		516	100	12	17				.187	.251	.217	.468
20	Phillies	.389	18	1913	7	11	18	548	94	16	3	1		34	3	76	9		598	119	20	13				.172	.224	.217	.441
21	Cardinals	.385	13	1931	5	8	13	426	82	14	3	2	11	19	1	43	10		451	108	19	5				.192	.229	.254	.482
22	Red Sox	.385	14	1915	5	8	14	418	74	7	5	0	12	39	7	61	8		479	91	12	15				.177	.259	.218	.476
23	Athletics	.385	14	1911	5	8	14	435	83	12	5	1	13	34	3		19		487	108	18	15				.191	.254	.248	.503
24	Orioles	.381	21	1974	8	13	21	674	122	18	2	3	18	53	6	114	11	8	740	153	23	6	1	5	18	.181	.247	.227	.474
25	Senators	.375	8	1925	3	5	8	246	54	4	1	0	8	17	1	18	3		270	60	5	6				.220	.273	.244	.517