Between the 1937 and 1940 seasons, the Philadelphia Phillies 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	PA	TB	XBH	SH	GIDP	AVG	OBP	SLG	OPS
1	Phillies	.331	201	406	611	20,886	2,321	5,366	903	141	267	2,140	1,757	51	2,160	176	23,086	7,352	1,311	392	248	.257	.316	.352	.668
2	Browns	.344	211	403	624	21,681	2,960	5,947	1,120	188	372	2,806	2,217	70	2,279	180	24,354	8,559	1,680	386	226	.274	.344	.395	.738
3	Athletics	.355	216	393	615	21,070	2,839	5,637	1,045	230	395	2,650	2,247	61	2,333	268	23,733	8,327	1,670	355	248	.268	.340	.395	.735
4	Senators	.454	277	333	617	21,751	2,938	6,097	1,038	302	228	2,708	2,176	70	1,842	314	24,352	8,423	1,568	355	203	.280	.348	.387	.735
5	Bees	.468	284	323	609	20,989	2,335	5,337	817	169	232	2,145	1,677	79	2,330	183	23,120	7,188	1,218	375	220	.254	.312	.342	.654
6	Dodgers	.498	303	305	619	21,257	2,725	5,564	1,004	259	269	2,507	2,166	86	2,407	250	23,882	7,893	1,532	373	242	.262	.332	.371	.704
7	Pirates	.520	318	293	615	21,590	2,886	6,025	1,025	280	251	2,665	1,978	84	1,803	192	24,041	8,363	1,556	389	244	.279	.342	.387	.729
8	White Sox	.521	318	292	613	21,141	2,979	5,867	977	250	271	2,733	2,140	64	2,007	291	23,798	8,157	1,498	453	231	.278	.346	.386	.732
9	Cardinals	.537	328	283	624	21,950	3,040	6,200	1,150	264	402	2,852	1,751	80	2,237	274	24,208	9,084	1,816	427	219	.282	.338	.414	.752
10	Giants	.540	327	278	607	21,037	2,803	5,726	873	161	443	2,614	1,828	133	1,997	147	23,370	8,250	1,477	372	283	.272	.334	.392	.726
11	Reds	.548	335	276	617	21,371	2,809	5,744	999	214	370	2,609	1,756	127	2,145	190	23,733	8,281	1,583	479	218	.269	.328	.387	.715
12	Cubs	.555	341	273	618	21,364	2,929	5,820	1,030	254	338	2,733	2,065	114	2,091	244	23,960	8,372	1,622	417	232	.272	.340	.392	.732
13	Tigers	.558	344	272	620	21,530	3,534	6,081	1,117	246	545	3,309	2,632	84	2,438	319	24,613	9,325	1,908	367	240	.282	.363	.433	.796
14	Red Sox	.559	339	267	610	21,372	3,485	6,181	1,155	257	467	3,269	2,431	66	2,118	231	24,316	9,251	1,879	447	275	.289	.364	.433	.796
15	Indians	.562	345	269	618	21,386	3,171	5,917	1,182	305	402	2,944	2,196	67	2,327	286	24,004	8,915	1,889	355	221	.277	.346	.417	.763
16	Yankees	.646	395	216	621	21,483	3,729	5,926	1,067	257	669	3,502	2,809	145	2,372	282	24,727	9,514	1,993	290	223	.276	.363	.443	.806