Between the 1946 and 1955 seasons, the Baltimore Orioles had the worst winning percentage by a team, winning 37.4 percent of the time.

	TEAM	W%	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	Orioles	.374	576	963	1,547	52,395	5,999	13,106	2,142	439	846	5,602	5,543	186	6,816	378	183	59,067	18,664	3,427	872	71	31	1,318	.250	.324	.356	.680
2	Pirates	.393	605	934	1,547	52,358	6,307	13,219	1,995	502	1,083	5,872	5,494	243	6,507	393	142	58,979	19,467	3,580	794	90	64	1,207	.252	.326	.372	.698
3	Senators	.422	648	889	1,544	52,271	6,143	13,166	2,109	545	624	5,739	5,753	256	5,934	488	164	59,120	18,237	3,278	760	80	23	1,290	.252	.329	.349	.677
4	Athletics	.432	666	874	1,550	52,350	6,499	13,372	2,146	455	873	6,055	6,104	242	5,785	386	168	59,646	19,047	3,474	885	65	34	1,367	.255	.336	.364	.699
5	Cubs	.442	680	857	1,546	52,881	6,227	13,559	2,158	491	1,142	5,816	4,693	240	6,695	448	157	58,595	20,125	3,791	708	73	45	1,227	.256	.319	.381	.700
6	Redlegs	.446	686	852	1,544	52,805	6,451	13,490	2,244	361	1,135	6,041	4,935	208	6,060	437	168	58,848	19,861	3,740	806	94	50	1,125	.255	.321	.376	.697
7	White Sox	.490	754	784	1,551	52,536	6,422	13,643	2,029	475	731	5,978	5,742	360	5,522	696	266	59,682	18,815	3,235	948	96	40	1,320	.260	.336	.358	.694
8	Phillies	.496	764	776	1,548	52,612	6,479	13,682	2,224	503	1,028	6,026	5,213	222	5,967	468	149	58,964	19,996	3,755	819	98	39	1,197	.260	.329	.380	.709
9	Tigers	.498	767	773	1,556	53,132	7,002	13,983	2,271	437	1,026	6,563	6,281	206	5,577	384	173	60,645	20,206	3,734	928	98	42	1,416	.263	.343	.380	.723
10	Giants	.529	816	727	1,548	52,841	7,398	13,807	1,962	466	1,647	6,953	5,586	309	5,957	395	131	59,582	21,642	4,075	744	102	44	1,136	.261	.335	.410	.744
11	Braves	.535	822	715	1,550	52,875	7,004	13,859	2,351	424	1,192	6,555	5,544	256	6,096	540	153	59,765	20,634	3,967	1,007	83	67	1,226	.262	.335	.390	.725
12	Cardinals	.544	838	703	1,551	53,359	7,274	14,307	2,545	544	1,099	6,779	5,627	294	5,428	358	189	60,104	21,237	4,188	714	110	53	1,244	.268	.341	.398	.739
13	Red Sox	.567	873	667	1,548	53,381	7,925	14,468	2,516	424	1,226	7,439	6,883	244	6,210	405	160	61,392	21,510	4,166	778	106	44	1,423	.271	.356	.403	.759
14	Indians	.589	908	633	1,553	52,772	7,218	13,850	2,128	448	1,374	6,825	6,146	252	6,481	413	160	60,192	20,996	3,950	904	118	36	1,238	.262	.342	.398	.739
15	Dodgers	.614	948	595	1,554	53,201	8,165	14,379	2,411	491	1,507	7,569	6,503	314	6,400	890	261	61,085	22,293	4,409	954	113	62	1,238	.270	.352	.419	.772
16	Yankees	.627	964	573	1,541	52,397	7,970	14,069	2,187	597	1,380	7,460	6,354	319	5,888	451	191	60,004	21,590	4,164	838	96	48	1,156	.269	.351	.412	.763