Between the 1925 and 1934 seasons, the Boston Red Sox had the lowest winning percentage by a team, winning 36.3 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	.363	555	972	1,532	52,354	6,315	13,785	2,702	611	405	5,803	4,591	217	5,004	664	58,529	18,924	3,718	1,367	.263	.325	.361	.687
2	Phillies	.395	603	923	1,532	53,732	7,488	15,465	2,810	491	915	6,944	4,500	260	4,994	529	59,826	22,002	4,216	1,334	.288	.346	.409	.755
3	White Sox	.425	648	878	1,535	52,907	6,975	14,421	2,605	639	407	6,420	5,028	285	4,339	932	59,838	19,525	3,651	1,618	.273	.339	.369	.708
4	Reds	.440	673	858	1,539	52,739	6,332	14,435	2,378	740	405	5,845	4,009	254	3,943	609	58,580	19,508	3,523	1,578	.274	.328	.370	.698
5	Braves	.440	674	859	1,541	53,241	6,381	14,539	2,357	601	479	5,835	3,780	263	4,091	589	58,810	19,535	3,437	1,526	.273	.324	.367	.691
6	Browns	.442	676	855	1,541	52,972	7,360	14,494	2,717	666	690	6,727	5,038	242	4,985	737	59,685	20,613	4,073	1,433	.274	.339	.389	.729
7	Dodgers	.479	733	797	1,541	53,276	7,039	14,802	2,549	667	752	6,552	4,564	250	4,940	676	59,325	20,941	3,968	1,235	.278	.338	.393	.731
8	Tigers	.500	768	768	1,548	53,971	8,125	15,410	2,957	838	645	7,435	5,349	236	4,700	1,044	60,985	21,978	4,440	1,429	.286	.353	.407	.760
9	Indians	.505	773	759	1,536	53,453	7,671	15,401	3,072	624	572	7,066	4,749	289	4,033	622	60,069	21,437	4,268	1,578	.288	.349	.401	.750
10	Pirates	.554	848	683	1,540	53,859	7,869	15,814	2,680	945	554	7,273	4,459	257	3,775	757	60,120	22,046	4,179	1,545	.294	.350	.409	.760
11	Senators	.558	852	675	1,541	53,796	8,017	15,485	2,750	861	494	7,358	5,252	299	4,117	938	60,941	21,439	4,105	1,594	.288	.354	.399	.753
12	Cubs	.561	860	674	1,544	53,712	7,748	15,281	2,832	585	954	7,222	4,750	295	5,388	708	60,278	22,145	4,371	1,521	.284	.346	.412	.758
13	Giants	.563	859	668	1,535	54,025	7,798	15,502	2,453	570	1,118	7,290	4,073	251	4,328	616	59,557	22,449	4,141	1,208	.287	.340	.416	.755
14	Cardinals	.569	873	661	1,542	53,932	8,026	15,478	3,000	745	897	7,432	4,580	275	4,884	863	60,166	22,659	4,642	1,379	.287	.346	.420	.766
15	Athletics	.601	914	606	1,528	53,069	8,507	15,436	2,920	661	1,102	7,915	5,487	270	4,990	549	60,414	22,984	4,683	1,588	.291	.360	.433	.793
16	Yankees	.607	931	604	1,545	53,807	9,222	15,689	2,652	811	1,410	8,576	6,426	226	5,483	796	61,837	24,193	4,873	1,378	.292	.370	.450	.819