Between the 1972 and 1981 seasons, the Toronto Blue Jays had the worst winning percentage by a team, winning 35.9 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	Blue Jays	.359	270	482	752	25,364	2,761	6,282	1,086	190	480	2,560	2,127	135	3,496	301	292	28,117	9,188	1,756	330	161	145	602	.248	.307	.362	.670
2	Mariners	.384	290	465	757	25,631	2,985	6,524	1,056	170	555	2,806	2,275	131	3,476	575	278	28,611	9,585	1,781	357	217	160	590	.255	.316	.374	.690
3	Padres	.422	657	901	1,559	52,588	5,558	12,836	2,004	372	842	5,156	4,912	244	8,303	1,135	543	59,090	18,110	3,218	985	361	609	1,051	.244	.310	.344	.654
4	Braves	.450	698	853	1,555	52,592	6,263	13,211	1,959	277	1,255	5,862	5,175	235	7,989	773	477	59,119	19,489	3,491	739	378	529	1,231	.251	.319	.371	.690
5	Mets	.454	705	849	1,557	52,467	5,715	12,874	2,034	339	855	5,268	5,169	278	8,108	803	548	59,085	18,151	3,228	762	409	558	1,275	.245	.314	.346	.660
6	Cubs	.464	720	833	1,557	53,024	6,337	13,563	2,207	360	1,042	5,868	5,288	251	7,990	765	567	59,769	19,616	3,609	756	450	632	1,219	.256	.324	.370	.694
7	Angels	.472	735	823	1,559	52,396	6,285	13,351	2,033	309	990	5,832	5,105	374	7,955	1,061	658	59,074	18,972	3,332	744	455	400	1,244	.255	.323	.362	.685
8	Indians	.475	732	810	1,542	52,298	6,361	13,579	2,003	310	1,090	5,925	4,963	271	6,785	900	682	58,682	19,472	3,403	672	478	372	1,315	.260	.324	.372	.697
9	White Sox	.479	741	806	1,552	52,705	6,414	13,796	2,196	364	1,113	5,970	4,792	351	7,487	844	557	58,902	20,059	3,673	585	469	393	1,294	.262	.325	.381	.705
10	Giants	.480	749	811	1,560	52,553	6,247	13,167	2,116	396	1,092	5,764	5,337	228	8,263	1,035	544	59,351	19,351	3,604	815	418	592	1,129	.251	.320	.368	.688
11	Rangers	.481	747	805	1,555	52,841	6,517	13,775	2,154	271	1,059	6,100	5,151	297	7,374	1,085	630	59,494	19,648	3,484	729	476	432	1,261	.261	.327	.372	.699
12	Brewers	.482	752	807	1,559	52,881	6,647	13,630	2,318	364	1,369	6,285	4,866	277	8,203	857	588	59,122	20,783	4,051	660	438	389	1,128	.258	.321	.393	.714
13	Expos	.484	754	803	1,557	52,540	6,111	13,139	2,219	349	1,091	5,650	5,054	288	8,223	1,127	555	59,128	19,329	3,659	851	395	638	1,134	.250	.317	.368	.685
14	Twins	.488	758	796	1,556	53,490	6,760	14,307	2,236	426	989	6,318	5,113	335	7,441	807	494	60,169	20,362	3,651	786	445	452	1,302	.267	.333	.381	.713
15	Tigers	.490	763	793	1,557	52,810	6,454	13,631	2,017	372	1,303	6,055	4,900	277	7,518	744	480	58,941	20,301	3,692	517	437	354	1,340	.258	.322	.384	.706
16	Cardinals	.494	767	786	1,556	53,358	6,449	14,164	2,404	483	798	5,981	4,654	262	7,500	1,167	582	59,430	19,928	3,685	696	460	667	1,277	.265	.325	.373	.698
17	Astros	.506	789	770	1,560	52,908	6,230	13,591	2,193	477	881	5,779	4,807	252	7,784	1,424	631	59,202	19,381	3,551	811	424	634	1,104	.257	.319	.366	.686
18	Athletics	.510	795	763	1,558	52,005	6,349	12,887	1,939	321	1,243	5,890	5,106	332	8,277	1,600	807	58,619	19,197	3,503	751	425	427	1,083	.248	.317	.369	.686
19	Phillies	.527	822	737	1,560	53,155	6,783	13,990	2,394	422	1,186	6,316	5,155	325	8,060	1,119	592	59,801	20,786	4,002	657	509	662	1,077	.263	.329	.391	.720
20	Royals	.546	848	705	1,553	53,283	7,047	14,325	2,538	526	1,000	6,602	5,160	317	6,634	1,587	713	59,853	20,915	4,064	539	554	455	1,157	.269	.334	.393	.726
21	Pirates	.554	859	692	1,553	53,715	6,832	14,343	2,456	471	1,193	6,368	4,418	305	8,041	1,290	594	59,551	21,320	4,120	643	470	714	1,106	.267	.324	.397	.721
22	Red Sox	.557	865	688	1,553	53,237	7,358	14,409	2,544	381	1,479	6,944	5,212	308	7,729	756	481	59,802	22,152	4,404	533	512	432	1,320	.271	.336	.416	.752
23	Yankees	.566	879	673	1,552	52,845	6,821	13,981	2,203	327	1,313	6,448	5,032	260	6,524	825	455	59,095	20,777	3,843	478	480	440	1,238	.265	.329	.393	.722
24	Dodgers	.570	889	672	1,562	53,191	6,661	13,867	2,081	290	1,309	6,270	5,248	247	7,914	1,175	549	60,022	20,455	3,680	886	450	678	1,153	.261	.327	.385	.712
25	Orioles	.578	894	653	1,547	52,419	6,602	13,390	2,245	273	1,305	6,159	5,474	311	8,050	1,039	512	59,167	20,096	3,823	524	439	459	1,275	.255	.327	.383	.710