Between the 1988 and 1997 seasons, the Philadelphia Phillies had the worst winning percentage by a team, winning 45.8 percent of the time.

	TEAM	W%	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Phillies	.458	712	842	1,556	52,910	6,518	13,426	2,508	346	1,139	6,105	5,241	376	9,675	984	373	59,600	20,043	3,993	639	434	529	1,083	.254	.323	.379	.702
2	Tigers	.460	715	840	1,555	52,857	7,450	13,500	2,418	271	1,700	7,030	6,141	343	10,370	918	495	60,183	21,560	4,389	385	457	360	1,187	.255	.334	.408	.742
3	Marlins	.476	354	390	744	25,224	3,150	6,500	1,103	142	618	2,982	2,603	256	4,912	527	239	28,572	9,741	1,863	281	208	206	578	.258	.331	.386	.717
4	Angels	.482	749	806	1,555	53,198	6,924	13,963	2,374	258	1,392	6,499	5,002	358	9,101	969	596	59,479	21,029	4,024	504	417	385	1,232	.262	.328	.395	.723
5	Mariners	.484	750	801	1,551	53,135	7,396	14,149	2,719	237	1,669	7,024	5,449	443	8,612	906	475	59,990	22,349	4,625	478	485	487	1,266	.266	.337	.421	.757
6	Cubs	.485	752	799	1,553	53,428	6,730	13,891	2,441	349	1,366	6,319	4,364	334	9,114	1,105	511	59,246	21,128	4,156	692	428	512	1,101	.260	.317	.395	.713
7	Rockies	.486	363	384	747	25,710	4,000	7,229	1,309	218	927	3,771	2,339	270	4,816	700	333	28,881	11,755	2,454	356	206	195	595	.281	.345	.457	.802
8	Twins	.487	756	797	1,553	53,593	7,327	14,734	2,805	345	1,206	6,862	4,898	515	8,385	1,120	562	59,822	21,847	4,356	325	491	382	1,375	.275	.339	.408	.746
9	Padres	.487	758	798	1,556	53,011	6,554	13,697	2,352	275	1,253	6,134	4,923	326	9,563	1,111	531	59,465	20,358	3,880	761	444	577	1,221	.258	.323	.384	.707
10	Brewers	.490	762	792	1,554	53,188	7,255	14,025	2,584	337	1,230	6,791	5,072	406	8,469	1,356	645	59,698	20,973	4,151	501	531	403	1,116	.264	.329	.394	.724
11	Cardinals	.491	762	791	1,556	52,686	6,395	13,612	2,489	373	998	6,003	5,031	309	9,140	1,641	702	59,161	19,841	3,860	683	452	513	1,088	.258	.324	.377	.701
12	Royals	.493	765	786	1,551	52,994	6,809	13,934	2,679	389	1,139	6,398	4,869	388	8,917	1,333	647	59,198	20,808	4,207	480	467	379	1,119	.263	.327	.393	.719
13	Mets	.496	769	781	1,550	52,517	6,758	13,309	2,469	274	1,381	6,359	4,959	360	9,150	1,046	496	59,004	20,469	4,124	682	486	545	1,003	.253	.319	.390	.709
14	Rangers	.500	777	776	1,554	53,405	7,393	14,212	2,661	315	1,531	6,980	5,372	377	9,888	969	460	60,132	22,096	4,507	499	479	414	1,211	.266	.335	.414	.748
15	Orioles	.502	778	772	1,551	52,771	7,158	13,655	2,434	262	1,638	6,802	5,830	431	8,844	793	410	59,981	21,527	4,334	454	495	417	1,291	.259	.335	.408	.743
16	Astros	.503	782	773	1,555	52,899	6,645	13,483	2,593	325	1,091	6,207	5,204	512	9,512	1,539	639	59,829	19,999	4,009	765	449	604	1,005	.255	.325	.378	.703
17	Pirates	.506	786	766	1,554	52,800	6,785	13,611	2,642	429	1,157	6,387	5,219	373	9,367	1,160	514	59,645	20,582	4,228	745	508	567	1,059	.258	.326	.390	.716
18	Giants	.508	790	765	1,555	52,826	6,811	13,420	2,292	371	1,420	6,388	5,061	421	10,125	1,130	562	59,545	20,714	4,083	827	410	651	969	.254	.322	.392	.714
19	Indians	.508	788	763	1,551	53,449	7,381	14,552	2,604	264	1,530	6,965	4,970	371	8,446	1,206	543	59,745	22,274	4,398	448	507	418	1,280	.272	.335	.417	.752
20	Reds	.514	798	755	1,554	52,790	6,822	13,708	2,581	326	1,393	6,357	5,003	342	9,713	1,562	622	59,292	21,120	4,300	685	472	554	1,000	.260	.325	.400	.725
21	Red Sox	.514	800	755	1,555	53,688	7,424	14,674	3,006	288	1,351	7,007	5,676	456	8,544	689	422	60,797	22,309	4,645	493	484	515	1,408	.273	.345	.416	.761
22	Yankees	.515	798	753	1,552	53,553	7,482	14,486	2,669	216	1,497	7,074	5,618	382	8,841	928	426	60,429	22,078	4,382	338	538	458	1,328	.270	.341	.412	.753
23	White Sox	.517	801	749	1,551	53,067	7,343	14,199	2,431	371	1,363	6,924	5,567	318	8,361	1,133	535	60,110	21,461	4,165	622	536	505	1,204	.268	.338	.404	.742
24	Blue Jays	.518	805	750	1,555	53,401	7,200	14,002	2,738	397	1,501	6,788	5,111	480	9,505	1,213	417	59,857	22,037	4,636	349	516	355	1,200	.262	.329	.413	.742
25	Expos	.518	805	748	1,555	52,826	6,519	13,479	2,670	351	1,186	6,057	4,782	439	9,658	1,669	642	59,218	20,409	4,207	732	439	551	1,029	.255	.320	.386	.706