The Chicago Cubs have the most wins - losses by a team in a season, with 80 in 1906.

	TEAM	W-L	W	L	SEASON	W%	L%	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Cubs	80	116	36	1906	.763	.237	155	5,018	704	1,316	181	71	20	539	448	45	516	283		5,742	1,699	272	231				.262	.328	.339	.667
2	Maroons	75	94	19	1884	.832	.168	114	4,285	887	1,251	259	41	32		181		542			4,466	1,688	332					.292		.394
3	Mariners	70	116	46	2001	.716	.284	162	5,680	927	1,637	310	38	169	881	614	62	989	174	42	6,474	2,530	517	48	70	54	112	.288	.360	.445	.805
4	Indians	68	111	43	1954	.721	.279	156	5,222	746	1,368	188	39	156	714	637	23	668	30	33	6,048	2,102	383	107	59		114	.262	.341	.403	.744
5	Pirates	68	110	42	1909	.724	.276	154	5,128	701	1,332	218	92	25	585	479	36	511	185		5,860	1,809	335	217				.260	.327	.353	.680
6	Pirates	67	103	36	1902	.741	.259	142	4,926	774	1,410	189	95	18	660	372	64	440	222		5,480	1,843	302	118				.286	.344	.374	.718
7	Yankees	66	114	48	1998	.704	.296	162	5,643	965	1,625	290	31	207	907	653	57	1,025	153	63	6,444	2,598	528	32	59	34	145	.288	.364	.460	.825
8	Yankees	66	110	44	1927	.714	.286	155	5,354	976	1,644	291	103	158	907	642	22	610	90	64	6,222	2,615	552	204				.307	.384	.488	.872
9	Athletics	62	107	45	1931	.704	.296	153	5,377	858	1,544	311	64	118	798	528	35	543	25	23	6,018	2,337	493	78				.287	.355	.435	.789
10	Cubs	62	107	45	1907	.704	.296	155	4,892	571	1,224	162	48	13	450	435	48	449	235		5,570	1,521	223	195				.250	.318	.311	.628
11	White Stockings	62	87	25	1885	.777	.223	113	4,093	834	1,079	184	75	54	606	340		429			4,433	1,575	313					.264		.385
12	Yankees	61	106	45	1939	.702	.298	152	5,300	967	1,521	259	55	166	904	701	36	543	72	37	6,129	2,388	480	92			99	.287	.374	.451	.825
13	Dodgers	60	111	51	2022	.685	.315	162	5,526	847	1,418	325	31	212	812	607	56	1,374	98	18	6,245	2,441	568	3	53	22	85	.257	.333	.442	.775
14	Yankees	60	107	47	1932	.695	.305	156	5,476	1,002	1,564	279	82	160	954	765	27	526	77	66	6,344	2,487	521	76				.286	.376	.454	.830
15	Giants	59	106	47	1904	.693	.307	158	5,150	744	1,347	202	65	31	564	434	79	459	283		5,828	1,772	298	165				.262	.328	.344	.673
16	Cardinals	58	106	48	1942	.688	.312	156	5,422	755	1,454	282	69	60	680	551	22	505	71		6,125	2,054	411	130			90	.268	.338	.379	.717
17	Athletics	58	104	46	1929	.693	.307	151	5,204	901	1,537	288	75	122	845	540	29	440	63	42	5,987	2,341	485	214				.295	.365	.450	.815
18	Red Sox	58	105	47	1912	.691	.309	154	5,071	799	1,404	269	84	29	654	565	45	586	185	182	5,872	1,928	382	191				.277	.355	.380	.735
19	Gothams	58	85	27	1885	.759	.241	112	4,029	691	1,085	150	82	16	464	221		312			4,250	1,447	248					.269		.359
20	Giants	57	105	48	1905	.686	.314	155	5,094	778	1,392	191	88	39	642	517	90	497	291		5,839	1,876	318	138				.273	.351	.368	.719
21	Indians	56	100	44	1995	.694	.306	144	5,028	840	1,461	279	23	207	803	542	35	766	132	53	5,684	2,407	509	31	48	40	128	.291	.361	.479	.839
22	Orioles	56	109	53	1969	.673	.327	162	5,518	779	1,465	234	29	175	722	634	43	806	82	45	6,328	2,282	438	74	59	62	138	.265	.343	.414	.756
23	Yankees	56	109	53	1961	.673	.327	163	5,559	827	1,461	194	40	240	781	543	35	785	28	18	6,239	2,455	474	57	45	45	120	.263	.330	.442	.771
24	Dodgers	56	105	49	1953	.682	.318	155	5,373	955	1,529	274	59	208	887	655	35	686	90	47	6,138	2,545	541	75			115	.285	.366	.474	.840
25	Cardinals	56	105	49	1944	.682	.318	157	5,474	772	1,507	274	59	100	722	543	27	471	37		6,168	2,199	433	124			96	.275	.344	.402	.745