The Washington Senators had the worst winning percentage by a team in 1949, winning 32.5 percent of the time.

	TEAM	W%	SEASON	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	GIDP	AVG	OBP	SLG	OPS
1	Senators	.325	1949	50	104	154	5,234	584	1,330	207	41	81	546	593	22	494	46	33	5,912	1,862	329	63	132	.254	.333	.356	.688
2	Browns	.344	1949	53	101	155	5,112	666	1,301	213	30	117	628	631	21	700	38	39	5,847	1,925	360	83	138	.254	.339	.377	.715
3	Cubs	.396	1949	61	93	154	5,214	593	1,336	212	53	97	539	396	26	573	53		5,723	1,945	362	87	121	.256	.312	.373	.685
4	Reds	.403	1949	62	92	156	5,469	627	1,423	264	35	86	588	429	20	559	31		5,994	2,015	385	76	116	.260	.316	.368	.685
5	White Sox	.409	1949	63	91	154	5,204	648	1,340	207	66	43	591	702	13	593	62	55	6,003	1,808	316	84	136	.257	.347	.347	.695
6	Pirates	.461	1949	71	83	154	5,214	681	1,350	191	41	126	626	548	22	554	48		5,870	2,001	358	86	96	.259	.332	.384	.716
7	Giants	.474	1949	73	81	156	5,308	736	1,383	203	52	147	690	613	24	523	43		6,009	2,131	402	64	125	.261	.340	.401	.741
8	Braves	.487	1949	75	79	157	5,336	706	1,376	246	33	103	654	684	23	656	28		6,139	1,997	382	96	130	.258	.345	.374	.719
9	Phillies	.526	1949	81	73	154	5,307	662	1,349	232	55	122	622	528	26	670	27		5,935	2,057	409	74	116	.254	.325	.388	.712
10	Athletics	.526	1949	81	73	154	5,123	726	1,331	214	49	82	680	783	25	493	36	25	6,048	1,889	345	117	160	.260	.361	.369	.729
11	Tigers	.565	1949	87	67	155	5,259	751	1,405	215	51	88	707	748	23	501	39	52	6,137	1,986	354	107	164	.267	.361	.378	.739
12	Indians	.578	1949	89	65	154	5,221	675	1,358	194	58	112	640	601	23	534	44	40	5,958	2,004	364	113	137	.260	.339	.384	.723
13	Cardinals	.623	1949	96	58	157	5,463	766	1,513	281	54	102	720	569	25	482	17		6,151	2,208	437	94	124	.277	.348	.404	.752
14	Red Sox	.623	1949	96	58	155	5,320	896	1,500	272	36	131	835	835	17	510	43	25	6,250	2,237	439	78	169	.282	.381	.420	.802
15	Dodgers	.630	1949	97	57	156	5,400	879	1,477	236	47	152	816	638	33	570	117		6,173	2,263	435	102	127	.274	.354	.419	.773
16	Yankees	.630	1949	97	57	155	5,196	829	1,396	215	60	115	760	729	32	539	58	30	6,041	2,076	390	84	141	.269	.362	.400	.762