Between the 1956 and 1965 seasons, the New York Mets had the lowest winning percentage by a team, winning 30.0 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	.300	194	452	650	21,835	2,182	5,060	720	133	445	2,019	1,818	166	4,130	164	173	24,184	7,381	1,298	232	133	144	496	.232	.294	.338	.632
2	Senators	.382	309	499	809	27,066	2,964	6,387	991	178	650	2,773	2,605	128	4,918	325	177	30,318	9,684	1,819	330	189	161	604	.236	.304	.358	.662
3	Athletics	.399	630	948	1,584	53,588	6,369	13,350	2,101	439	1,220	5,972	5,022	283	8,283	472	268	59,990	19,989	3,760	708	389	302	1,285	.249	.315	.373	.688
4	Astros	.404	261	385	648	21,728	2,120	5,067	690	169	334	1,944	1,832	163	3,493	211	145	24,162	7,097	1,193	305	134	166	489	.233	.296	.327	.623
5	Cubs	.433	681	891	1,584	53,892	6,416	13,364	2,134	456	1,461	6,033	4,936	321	9,535	521	370	60,122	20,793	4,051	586	387	553	1,120	.248	.313	.386	.699
6	Phillies	.466	732	838	1,575	53,264	6,378	13,380	2,108	478	1,219	5,941	4,981	396	9,035	504	354	59,776	20,101	3,805	749	386	525	1,196	.251	.318	.377	.695
7	Twins	.472	744	833	1,583	53,536	6,882	13,319	2,089	415	1,602	6,479	5,695	380	8,686	425	322	60,721	21,044	4,106	705	405	390	1,270	.249	.323	.393	.716
8	Red Sox	.474	747	830	1,580	53,887	7,041	13,918	2,455	360	1,476	6,668	5,941	265	8,458	375	240	61,051	21,521	4,291	580	378	392	1,426	.258	.333	.399	.732
9	Angels	.474	383	425	809	27,145	3,130	6,662	1,044	158	615	2,912	2,646	150	4,794	282	181	30,565	9,867	1,817	417	207	196	580	.245	.314	.363	.677
10	Pirates	.507	797	774	1,578	54,227	6,526	14,356	2,220	565	1,144	6,113	4,222	245	8,175	389	314	59,839	21,138	3,929	741	404	549	1,268	.265	.319	.390	.708
11	Indians	.513	809	768	1,580	53,765	6,906	13,606	2,121	258	1,567	6,466	5,110	381	8,339	537	349	60,446	20,944	3,946	751	439	396	1,127	.253	.320	.390	.709
12	Tigers	.521	823	756	1,582	53,717	7,086	13,736	2,036	401	1,541	6,634	5,812	340	7,931	584	311	60,991	21,197	3,978	711	411	401	1,206	.256	.330	.395	.725
13	Cardinals	.523	822	749	1,577	54,441	6,960	14,510	2,304	475	1,209	6,440	4,886	277	7,783	638	424	60,606	21,391	3,988	632	370	562	1,164	.267	.328	.393	.721
14	Orioles	.527	831	746	1,583	53,176	6,229	13,119	2,087	308	1,256	5,810	5,312	278	8,341	528	325	59,973	19,590	3,651	806	401	393	1,301	.247	.316	.368	.685
15	Giants	.533	839	736	1,579	53,889	7,000	13,867	2,086	418	1,677	6,500	4,771	319	8,085	680	395	60,063	21,820	4,181	668	416	553	1,187	.257	.319	.405	.724
16	Reds	.538	846	726	1,574	54,053	7,266	14,186	2,394	397	1,592	6,830	5,047	375	8,499	695	367	60,566	22,150	4,383	670	421	572	1,103	.262	.327	.410	.737
17	Braves	.559	880	694	1,579	53,938	7,234	14,053	2,192	392	1,753	6,784	4,910	322	8,257	519	295	60,291	22,288	4,337	711	410	588	1,198	.261	.324	.413	.737
18	Dodgers	.561	885	692	1,580	53,191	6,884	13,563	1,914	418	1,336	6,369	5,365	282	8,497	1,098	517	60,174	20,321	3,668	921	415	543	1,180	.255	.324	.382	.706
19	White Sox	.567	896	684	1,585	53,866	6,971	13,835	2,137	430	1,119	6,481	5,752	528	7,353	880	398	61,446	20,189	3,686	829	471	394	1,184	.257	.332	.375	.707
20	Yankees	.600	948	631	1,585	54,430	7,471	14,122	2,079	398	1,783	7,037	5,277	286	8,288	431	263	61,137	22,346	4,260	746	398	486	1,119	.259	.326	.411	.737