Between the 1958 and 1967 seasons, the New York Mets had the worst winning percentage by a team, winning 33.1 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	.331	321	648	973	32,623	3,267	7,634	1,085	191	626	3,014	2,626	245	6,103	277	263	36,063	10,979	1,902	363	206	248	736	.234	.294	.337	.631
2	Senators	.404	456	672	1,129	37,825	4,071	8,843	1,344	243	891	3,819	3,527	185	7,024	431	251	42,267	13,346	2,478	477	253	226	848	.234	.300	.353	.653
3	Athletics	.411	655	937	1,597	53,839	6,284	13,266	2,126	464	1,081	5,842	5,053	307	8,798	661	320	60,287	19,563	3,671	709	379	314	1,202	.246	.313	.363	.676
4	Astros	.414	402	568	973	32,745	3,358	7,844	1,152	250	539	3,095	2,860	223	5,312	389	230	36,509	11,113	1,941	467	214	315	740	.240	.303	.339	.643
5	Cubs	.444	705	882	1,595	54,318	6,537	13,562	2,123	467	1,440	6,125	4,995	363	9,680	577	404	60,684	20,939	4,030	614	394	596	1,141	.250	.315	.385	.700
6	Red Sox	.468	745	848	1,595	54,240	6,917	13,777	2,407	366	1,487	6,504	5,656	278	9,073	421	283	61,167	21,377	4,260	621	372	415	1,353	.254	.326	.394	.720
7	Phillies	.475	753	833	1,589	53,827	6,395	13,510	2,133	481	1,201	5,937	4,917	380	9,606	537	409	60,297	20,208	3,815	813	360	588	1,142	.251	.316	.375	.692
8	Angels	.484	547	584	1,132	37,812	4,301	9,171	1,393	249	851	3,998	3,624	219	6,877	402	271	42,505	13,615	2,493	574	276	297	798	.243	.310	.360	.670
9	Indians	.503	801	793	1,596	54,381	6,645	13,628	2,092	269	1,560	6,190	4,703	392	8,690	563	376	60,618	20,938	3,921	733	409	420	1,123	.251	.313	.385	.698
10	Twins	.508	810	783	1,600	53,951	6,961	13,393	2,111	396	1,654	6,525	5,503	378	8,898	497	329	60,934	21,258	4,161	695	407	428	1,241	.248	.320	.394	.714
11	Tigers	.528	842	753	1,598	53,922	7,085	13,564	2,019	395	1,606	6,615	5,843	369	8,653	583	293	61,239	21,191	4,020	702	403	416	1,188	.252	.327	.393	.720
12	Reds	.528	838	748	1,587	54,413	7,040	14,128	2,425	419	1,442	6,594	4,739	338	8,833	761	422	60,514	21,717	4,286	621	403	584	1,111	.260	.321	.399	.720
13	Pirates	.531	842	745	1,591	55,004	6,790	14,740	2,221	576	1,191	6,346	4,257	275	8,615	462	343	60,624	21,686	3,988	685	403	638	1,279	.268	.322	.394	.716
14	Cardinals	.532	843	743	1,590	54,637	6,811	14,409	2,256	484	1,176	6,316	4,678	306	8,385	785	460	60,653	21,161	3,916	659	373	562	1,137	.264	.323	.387	.711
15	Braves	.538	855	735	1,594	54,340	7,166	14,017	2,170	337	1,742	6,725	4,987	345	8,674	569	351	60,718	22,087	4,249	634	412	594	1,226	.258	.322	.406	.728
16	Orioles	.540	859	733	1,596	53,807	6,470	13,289	2,156	314	1,391	6,065	5,292	302	8,848	541	328	60,582	20,246	3,861	776	405	449	1,264	.247	.316	.376	.692
17	Dodgers	.550	876	717	1,596	53,778	6,599	13,607	1,918	409	1,200	6,071	5,081	324	8,622	1,123	557	60,522	19,943	3,527	932	407	535	1,153	.253	.319	.371	.690
18	Giants	.558	887	703	1,594	54,416	7,144	13,977	2,119	389	1,696	6,622	4,856	347	8,595	600	383	60,750	21,962	4,204	739	392	606	1,220	.257	.320	.404	.723
19	White Sox	.560	893	703	1,601	54,046	6,593	13,498	2,085	420	1,061	6,100	5,457	467	7,672	978	474	61,263	19,606	3,566	844	449	437	1,130	.250	.321	.363	.684
20	Yankees	.562	895	697	1,600	54,620	7,024	13,756	2,034	342	1,710	6,611	5,118	283	8,686	443	254	61,124	21,604	4,086	707	396	458	1,115	.252	.317	.396	.713