Between the 1927 and 1936 seasons, the Philadelphia Phillies had the lowest winning percentage by a team, winning 38.9 percent of the time.

	TEAM	W%	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Phillies	.389	595	934	1,537	53,973	7,400	15,392	2,777	461	935	6,887	4,465	251	5,220	536	59,924	21,896	4,173	1,235	.285	.343	.406	.748
2	Red Sox	.402	614	915	1,535	52,664	6,607	14,026	2,766	618	487	6,065	4,804	200	5,077	716	58,978	19,489	3,871	1,310	.266	.330	.370	.700
3	Bees	.421	647	888	1,545	53,447	6,255	14,374	2,328	547	564	5,770	3,735	254	4,381	474	58,797	19,488	3,439	1,361	.269	.320	.365	.684
4	White Sox	.422	643	879	1,532	53,241	7,091	14,489	2,536	618	471	6,568	5,078	248	4,380	790	59,944	19,674	3,625	1,377	.272	.338	.370	.708
5	Reds	.423	648	883	1,537	52,875	6,263	14,283	2,383	671	481	5,808	3,948	261	4,414	590	58,397	19,451	3,535	1,313	.270	.324	.368	.692
6	Browns	.428	654	874	1,542	53,037	7,302	14,373	2,750	637	660	6,750	5,320	209	5,340	695	59,841	20,377	4,047	1,275	.271	.340	.384	.724
7	Dodgers	.477	731	800	1,543	53,662	7,003	14,851	2,551	630	740	6,524	4,472	249	5,071	678	59,495	20,882	3,921	1,112	.277	.335	.389	.724
8	Indians	.508	777	754	1,540	53,903	7,847	15,547	3,136	676	709	7,311	4,747	259	4,370	573	60,247	22,162	4,521	1,338	.288	.349	.411	.760
9	Tigers	.511	784	749	1,541	54,174	8,268	15,451	3,026	802	759	7,608	5,386	224	4,808	1,002	60,955	22,358	4,587	1,171	.285	.352	.413	.765
10	Senators	.538	824	708	1,544	54,407	8,099	15,575	2,803	872	489	7,473	5,332	279	4,142	844	61,345	21,589	4,164	1,327	.286	.353	.397	.750
11	Pirates	.548	839	693	1,539	54,176	7,735	15,788	2,659	904	558	7,160	4,500	244	4,001	574	60,299	21,929	4,121	1,379	.291	.348	.405	.753
12	Athletics	.562	854	666	1,528	53,281	8,423	15,331	2,846	621	1,149	7,864	5,520	249	5,303	528	60,373	22,866	4,616	1,323	.288	.357	.429	.786
13	Giants	.576	882	649	1,542	54,603	7,911	15,697	2,485	555	1,151	7,381	4,146	271	4,345	506	60,233	22,745	4,191	1,213	.287	.341	.417	.757
14	Cardinals	.580	890	645	1,542	54,216	8,005	15,447	3,067	702	872	7,419	4,502	249	5,050	850	60,168	22,534	4,641	1,201	.285	.343	.416	.758
15	Cubs	.585	897	637	1,543	54,025	7,945	15,481	2,865	564	966	7,421	4,863	298	5,404	663	60,645	22,372	4,395	1,459	.287	.349	.414	.763
16	Yankees	.629	962	567	1,538	54,042	9,552	15,850	2,713	815	1,465	8,887	6,622	240	5,485	793	62,030	24,588	4,993	1,126	.293	.373	.455	.828