Between the 1962 and 1965 seasons, the New York Mets had the worst 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	.383	248	399	648	21,700	2,346	5,080	774	134	531	2,195	2,047	107	4,001	244	130	24,256	7,715	1,439	257	145	131	477	.234	.301	.356	.657
3	Athletics	.403	261	387	649	21,988	2,566	5,438	847	184	487	2,413	2,154	144	3,756	267	118	24,724	8,114	1,518	282	156	143	505	.247	.317	.369	.686
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	Red Sox	.443	286	359	645	22,105	2,730	5,635	1,001	156	668	2,571	2,111	111	3,758	131	89	24,648	8,952	1,825	195	126	166	568	.255	.321	.405	.726
6	Cubs	.446	289	359	650	22,023	2,486	5,391	842	183	532	2,329	1,974	143	4,082	281	206	24,522	8,195	1,557	221	161	213	459	.245	.309	.372	.681
7	Angels	.484	313	334	647	21,721	2,386	5,331	826	136	426	2,212	1,965	120	3,726	245	153	24,313	7,707	1,388	337	170	171	464	.245	.309	.355	.664
8	Indians	.502	325	323	650	22,052	2,669	5,408	822	94	669	2,491	1,977	176	3,961	282	149	24,668	8,425	1,585	293	170	199	431	.245	.310	.382	.692
9	Pirates	.521	337	310	648	22,271	2,611	5,828	863	225	448	2,439	1,713	105	3,754	197	151	24,513	8,485	1,536	271	153	229	525	.262	.315	.381	.696
10	Tigers	.522	338	309	648	21,837	2,837	5,412	775	156	676	2,659	2,314	148	3,666	259	121	24,723	8,527	1,607	260	164	179	476	.248	.322	.390	.712
11	Braves	.531	344	304	649	22,109	2,918	5,662	925	137	675	2,728	2,000	152	3,730	249	157	24,649	8,886	1,737	241	147	211	496	.256	.320	.402	.722
12	Phillies	.534	345	301	647	21,965	2,694	5,595	873	197	542	2,514	1,868	173	3,893	211	148	24,511	8,488	1,612	342	163	223	443	.255	.316	.386	.702
13	Cardinals	.541	350	297	649	22,525	2,943	6,014	926	196	483	2,703	1,877	123	3,568	336	186	24,990	8,781	1,605	320	145	192	418	.267	.325	.390	.715
14	Orioles	.546	354	294	649	21,852	2,616	5,378	888	124	589	2,454	2,051	115	3,797	287	135	24,494	8,281	1,601	312	164	195	515	.246	.312	.379	.691
15	Twins	.561	363	284	649	22,190	3,076	5,662	922	162	781	2,898	2,303	151	3,723	203	89	25,126	9,251	1,865	306	176	199	458	.255	.327	.417	.744
16	Reds	.563	365	283	649	22,280	2,935	5,783	965	183	602	2,734	1,967	171	3,840	330	173	24,821	8,920	1,750	257	146	267	434	.260	.322	.400	.723
17	White Sox	.574	372	276	648	22,022	2,679	5,504	842	174	437	2,483	2,286	176	3,388	265	140	25,002	8,005	1,453	346	172	190	456	.250	.323	.364	.687
18	Giants	.578	376	275	652	22,197	2,941	5,738	795	148	725	2,718	1,945	151	3,455	239	161	24,766	9,004	1,668	306	167	236	512	.259	.320	.406	.726
19	Dodgers	.581	378	273	654	21,980	2,704	5,575	743	170	407	2,468	1,955	129	3,537	635	250	24,634	7,879	1,320	391	179	224	431	.254	.316	.358	.674
20	Yankees	.581	376	271	649	22,325	2,872	5,624	841	130	698	2,721	2,027	113	3,577	173	93	24,899	8,819	1,669	285	149	218	449	.252	.315	.395	.710