Between the 1926 and 1935 seasons, the Boston Red Sox had the lowest winning percentage by a team, winning 38.4 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	Red Sox	.384	586	942	1,534	52,474	6,393	13,867	2,726	610	433	5,872	4,694	209	5,053	713	58,747	19,112	3,769	1,370	.264	.327	.364	.691
2	Phillies	.393	599	927	1,535	53,762	7,361	15,333	2,771	465	907	6,837	4,436	252	5,113	533	59,735	21,755	4,143	1,285	.285	.343	.405	.747
3	Braves	.419	642	891	1,541	53,185	6,248	14,368	2,330	564	513	5,736	3,728	252	4,147	532	58,626	19,365	3,407	1,461	.270	.321	.364	.685
4	White Sox	.422	643	881	1,534	52,996	6,902	14,399	2,568	622	443	6,372	4,945	256	4,339	847	59,696	19,540	3,633	1,499	.272	.337	.369	.705
5	Browns	.431	659	871	1,542	52,902	7,180	14,320	2,704	649	653	6,603	5,132	225	5,170	697	59,665	20,281	4,006	1,406	.271	.338	.383	.721
6	Reds	.432	661	870	1,540	52,802	6,288	14,348	2,401	718	434	5,826	3,992	261	4,163	573	58,540	19,487	3,553	1,485	.272	.326	.369	.695
7	Dodgers	.480	735	795	1,542	53,218	6,964	14,681	2,534	649	747	6,496	4,557	251	5,077	699	59,217	20,754	3,930	1,191	.276	.336	.390	.726
8	Tigers	.509	780	753	1,544	54,023	8,140	15,360	2,981	837	701	7,478	5,338	223	4,769	1,017	60,905	22,118	4,519	1,321	.284	.351	.409	.761
9	Indians	.513	785	746	1,537	53,547	7,664	15,361	3,112	643	613	7,106	4,687	278	4,221	595	59,997	21,598	4,368	1,485	.287	.347	.403	.751
10	Senators	.538	823	706	1,543	54,197	8,012	15,500	2,754	885	470	7,373	5,310	292	4,104	857	61,259	21,434	4,109	1,460	.286	.353	.395	.748
11	Pirates	.548	839	692	1,540	53,902	7,700	15,706	2,619	930	542	7,135	4,417	251	3,849	628	60,057	21,811	4,091	1,487	.291	.348	.405	.752
12	Giants	.565	864	664	1,539	54,321	7,832	15,603	2,462	565	1,127	7,311	4,054	258	4,313	569	59,862	22,576	4,154	1,229	.287	.340	.416	.755
13	Cardinals	.581	892	643	1,543	54,060	8,027	15,434	2,994	724	874	7,442	4,538	267	4,991	864	60,207	22,498	4,592	1,342	.285	.344	.416	.760
14	Cubs	.581	892	642	1,544	53,845	7,872	15,389	2,881	577	956	7,344	4,817	295	5,389	680	60,478	22,292	4,414	1,521	.286	.348	.414	.762
15	Athletics	.583	884	633	1,524	52,945	8,386	15,247	2,865	626	1,138	7,822	5,516	256	5,163	525	60,204	22,778	4,629	1,487	.288	.358	.430	.788
16	Yankees	.622	951	579	1,538	53,671	9,334	15,681	2,660	807	1,404	8,678	6,564	230	5,472	795	61,741	24,167	4,871	1,276	.292	.372	.450	.822