Between the 1954 and 1963 seasons, the New York Mets had the worst winning percentage by a team, winning 28.3 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	Mets	.283	91	231	323	10,828	1,118	2,486	322	75	235	1,032	1,073	79	2,069	100	100	12,163	3,663	632	104	79	70	228	.230	.302	.338	.640
2	Senators	.366	177	307	485	16,296	1,795	3,914	613	117	389	1,682	1,521	66	2,669	248	128	18,203	5,928	1,119	201	119	91	373	.240	.306	.364	.669
3	Athletics	.402	628	934	1,570	53,212	6,343	13,358	2,079	438	1,159	5,927	4,919	260	7,554	380	262	59,478	19,790	3,676	693	394	275	1,265	.251	.315	.372	.687
4	Colt .45's	.404	130	192	324	10,942	1,056	2,554	340	86	167	969	949	68	1,744	81	60	12,181	3,567	593	161	61	76	251	.233	.297	.326	.623
5	Cubs	.430	669	886	1,566	53,380	6,458	13,356	2,109	473	1,505	6,071	4,811	307	9,045	469	340	59,491	20,926	4,087	608	385	485	1,130	.250	.314	.392	.706
6	Twins	.437	682	879	1,567	52,829	6,601	13,079	1,971	450	1,392	6,219	5,735	364	8,068	349	320	60,027	20,126	3,813	710	389	291	1,295	.248	.323	.381	.704
7	Phillies	.455	707	848	1,559	52,519	6,365	13,269	2,119	482	1,179	5,935	5,303	354	8,313	502	346	59,289	19,889	3,780	714	399	443	1,255	.253	.323	.379	.702
8	Angels	.467	226	258	485	16,429	2,059	4,086	658	95	421	1,918	1,731	102	2,901	126	85	18,634	6,197	1,174	246	126	108	336	.249	.322	.377	.699
9	Pirates	.476	740	815	1,561	53,236	6,305	13,903	2,169	571	1,079	5,910	4,432	232	7,586	342	278	59,097	20,451	3,819	779	418	483	1,260	.261	.318	.384	.703
10	Orioles	.481	751	810	1,568	52,726	5,932	13,035	2,003	338	1,075	5,536	5,275	263	7,789	447	333	59,464	18,939	3,416	811	389	308	1,294	.247	.317	.359	.676
11	Red Sox	.491	766	795	1,566	53,559	7,139	13,943	2,443	371	1,385	6,757	6,191	259	7,967	404	247	61,063	21,283	4,199	635	419	349	1,398	.260	.337	.397	.735
12	Cardinals	.507	789	767	1,561	53,908	6,991	14,457	2,343	470	1,253	6,497	5,022	285	7,159	592	426	60,188	21,499	4,066	566	407	515	1,219	.268	.331	.399	.730
13	Tigers	.509	796	767	1,566	53,352	7,066	13,822	2,073	396	1,442	6,618	5,871	303	7,251	556	309	60,679	21,013	3,911	722	431	353	1,257	.259	.334	.394	.727
14	Reds	.523	814	742	1,557	53,338	7,271	14,052	2,343	372	1,607	6,860	5,165	354	7,824	621	357	60,008	21,960	4,322	709	442	469	1,085	.263	.330	.412	.742
15	Giants	.533	831	728	1,562	53,392	7,096	13,886	2,099	413	1,708	6,613	4,809	324	7,483	637	378	59,626	21,935	4,220	663	438	455	1,138	.260	.323	.411	.733
16	Indians	.543	847	714	1,564	53,061	6,998	13,546	2,098	285	1,551	6,582	5,464	357	7,802	407	309	60,149	20,867	3,934	792	475	306	1,144	.255	.326	.393	.720
17	Braves	.565	880	678	1,563	53,343	7,136	13,884	2,111	428	1,719	6,700	4,991	310	7,810	498	275	59,849	22,008	4,258	781	424	551	1,171	.260	.325	.413	.737
18	White Sox	.568	888	676	1,571	53,254	7,118	13,908	2,160	435	1,098	6,640	5,829	542	6,666	922	429	60,955	20,232	3,693	851	479	314	1,202	.261	.337	.380	.717
19	Dodgers	.576	898	662	1,562	52,711	7,297	13,683	2,017	447	1,566	6,807	5,743	287	8,056	910	475	60,042	21,292	4,030	852	449	493	1,265	.260	.333	.404	.737
20	Yankees	.621	971	592	1,568	53,642	7,696	14,136	2,069	446	1,780	7,237	5,525	302	7,648	431	291	60,667	22,437	4,295	769	429	408	1,077	.264	.333	.418	.752