Between the 1934 and 1937 seasons, the St. Louis Browns had the lowest winning percentage by a team, winning 38.5 percent of the time.

	TEAM	W%	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Browns	.385	235	375	620	21,554	2,911	5,936	1,169	220	285	2,749	2,244	66	2,328	180	24,238	8,400	1,674	374	.275	.346	.390	.735
2	Phillies	.386	235	374	614	21,549	2,810	5,966	1,043	150	354	2,608	1,719	92	2,421	220	23,701	8,371	1,547	341	.277	.333	.388	.721
3	Athletics	.386	233	370	610	21,190	2,887	5,803	997	214	422	2,694	2,075	54	2,337	254	23,648	8,494	1,633	329	.274	.340	.401	.741
4	Reds	.408	250	362	615	21,280	2,570	5,636	910	265	283	2,406	1,552	121	2,249	227	23,250	7,925	1,458	297	.265	.318	.372	.691
5	Bees	.436	266	344	614	21,281	2,468	5,571	873	163	288	2,321	1,646	96	2,165	118	23,396	7,634	1,324	373	.262	.318	.359	.676
6	Dodgers	.441	270	342	618	21,706	2,737	5,941	1,040	210	208	2,515	1,837	94	2,116	239	23,972	8,025	1,458	335	.274	.333	.370	.703
7	Senators	.471	288	323	620	22,049	3,198	6,263	1,071	333	192	2,956	2,336	105	1,761	266	24,822	8,576	1,596	332	.284	.355	.389	.744
8	White Sox	.483	294	315	613	21,359	3,142	5,930	1,061	214	272	2,946	2,378	81	1,794	218	24,259	8,235	1,547	441	.278	.352	.386	.738
9	Red Sox	.504	308	303	616	21,362	3,134	5,914	1,125	259	306	2,903	2,407	81	2,027	341	24,284	8,475	1,690	434	.277	.352	.397	.749
10	Indians	.537	330	285	623	21,930	3,328	6,337	1,325	281	419	3,109	2,065	73	2,023	259	24,415	9,481	2,025	347	.289	.352	.432	.784
11	Pirates	.540	330	281	614	21,795	2,986	6,230	1,042	333	225	2,742	1,877	79	1,817	143	24,058	8,613	1,600	307	.286	.345	.395	.740
12	Cardinals	.584	359	256	620	21,972	3,212	6,227	1,176	261	372	2,974	1,623	68	2,202	287	23,996	9,041	1,809	333	.283	.335	.411	.746
13	Cubs	.597	366	247	614	21,591	3,118	6,157	1,094	216	361	2,915	1,868	113	2,059	264	24,071	8,766	1,671	499	.285	.345	.406	.751
14	Tigers	.597	366	247	615	21,874	3,733	6,465	1,285	253	424	3,431	2,566	99	2,153	357	24,910	9,528	1,962	371	.296	.372	.436	.808
15	Giants	.606	371	241	615	21,797	3,004	6,106	976	186	457	2,783	1,641	122	1,949	127	23,997	8,825	1,619	437	.280	.334	.405	.739
16	Yankees	.634	387	223	615	21,660	3,704	6,186	1,079	287	595	3,464	2,716	115	2,271	276	24,780	9,624	1,961	289	.286	.368	.444	.812