Between the 1936 and 1945 seasons, the Philadelphia Phillies had the lowest winning percentage by a team, winning 33.5 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	.335	511	1,016	1,536	52,444	5,598	13,286	2,091	367	655	5,171	4,466	177	5,391	443	58,040	18,076	3,113	953	866	.253	.314	.345	.659
2	Athletics	.367	561	967	1,540	52,916	6,331	13,706	2,282	533	680	5,865	5,088	177	5,417	520	59,072	19,094	3,495	891	899	.259	.326	.361	.687
3	Browns	.433	662	866	1,548	53,380	7,135	14,142	2,606	492	853	6,703	5,825	166	5,872	435	60,350	20,291	3,951	979	754	.265	.339	.380	.719
4	Braves	.444	676	846	1,534	52,877	5,852	13,325	2,146	371	634	5,429	4,496	201	5,645	491	58,509	18,115	3,151	935	757	.252	.313	.343	.656
5	Senators	.475	726	803	1,540	53,878	7,088	14,653	2,440	670	489	6,513	5,420	218	4,805	974	60,358	19,900	3,599	842	745	.272	.341	.369	.710
6	White Sox	.504	766	754	1,529	52,583	6,787	13,989	2,325	545	481	6,194	5,300	187	4,824	879	59,033	18,847	3,351	963	803	.266	.335	.358	.694
7	Giants	.511	778	745	1,536	53,037	6,796	14,125	2,039	394	1,032	6,346	4,811	309	4,877	365	59,146	20,048	3,465	989	918	.266	.331	.378	.709
8	Pirates	.525	801	726	1,548	53,705	7,127	14,556	2,461	683	605	6,596	5,306	203	5,023	561	60,116	20,198	3,749	902	825	.271	.339	.376	.715
9	Indians	.525	802	726	1,541	53,280	7,159	14,377	2,743	672	868	6,654	5,303	169	5,634	598	59,721	21,068	4,283	969	783	.270	.338	.395	.733
10	Dodgers	.526	805	726	1,550	53,722	7,129	14,336	2,591	562	617	6,539	5,424	212	5,191	602	60,363	19,902	3,770	1,005	751	.267	.336	.370	.707
11	Red Sox	.528	806	720	1,540	53,521	7,787	14,797	2,716	571	956	7,256	5,840	193	5,284	639	60,657	21,523	4,243	1,103	831	.276	.350	.402	.752
12	Reds	.528	810	723	1,543	53,125	6,391	13,743	2,313	463	732	5,923	4,385	276	5,110	539	58,841	19,178	3,508	1,055	778	.259	.318	.361	.679
13	Cubs	.529	813	724	1,548	53,396	7,008	14,318	2,440	510	768	6,476	5,276	253	5,340	589	60,033	20,082	3,718	1,108	757	.268	.337	.376	.713
14	Tigers	.539	829	710	1,551	53,656	7,653	14,595	2,554	531	1,010	7,091	5,920	206	5,540	635	60,728	21,241	4,095	946	901	.272	.347	.396	.742
15	Cardinals	.602	923	611	1,559	54,762	7,531	15,210	2,807	624	854	6,987	4,771	217	5,258	593	60,939	21,827	4,285	1,189	674	.278	.338	.399	.737
16	Yankees	.629	963	569	1,547	53,612	8,444	14,598	2,471	651	1,399	7,922	6,482	318	5,838	680	61,192	22,568	4,521	780	792	.272	.354	.421	.775