Between the 1998 and 2007 seasons, the Tampa Bay Devil Rays had the worst winning percentage by a team, winning 39.9 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	Devil Rays	.399	645	972	1,617	55,530	7,120	14,570	2,823	343	1,488	6,764	4,774	544	10,796	1,190	498	61,681	22,543	4,654	394	439	284	1,214	.262	.325	.406	.730
2	Royals	.413	668	950	1,618	55,789	7,635	14,970	2,884	383	1,391	7,190	4,714	635	9,675	1,006	432	62,136	22,793	4,658	469	529	284	1,331	.268	.329	.409	.738
3	Pirates	.432	699	918	1,618	55,096	7,044	14,241	2,834	321	1,482	6,690	4,871	771	11,046	894	417	61,869	22,163	4,637	688	443	391	1,199	.258	.325	.402	.727
4	Tigers	.434	703	915	1,618	55,822	7,441	14,823	2,872	429	1,719	7,090	4,553	553	10,576	924	486	61,791	23,710	5,020	399	464	266	1,215	.266	.325	.425	.749
5	Brewers	.444	719	899	1,619	55,055	7,234	14,125	2,903	263	1,759	6,911	5,419	679	11,938	877	404	62,227	22,831	4,925	655	419	461	1,277	.257	.328	.415	.743
6	Orioles	.447	723	896	1,621	55,907	7,654	15,019	2,971	224	1,718	7,279	5,112	594	9,245	1,100	448	62,501	23,592	4,913	405	483	312	1,357	.269	.334	.422	.756
7	Nationals	.448	726	894	1,620	54,722	6,909	14,073	3,042	315	1,480	6,547	5,033	539	10,509	884	467	61,498	22,185	4,837	810	394	535	1,281	.257	.324	.405	.729
8	Rockies	.464	752	869	1,621	56,101	8,500	15,694	3,144	419	1,810	8,056	5,465	527	10,467	860	441	63,352	25,106	5,373	799	460	462	1,304	.280	.347	.448	.794
9	Marlins	.468	758	861	1,619	55,290	7,264	14,544	2,944	359	1,530	6,859	5,153	630	11,169	1,198	518	62,182	22,796	4,833	664	445	454	1,203	.263	.330	.412	.743
10	Reds	.476	772	849	1,623	55,547	7,680	14,469	2,958	243	1,911	7,336	5,671	624	11,856	1,028	386	62,921	23,646	5,112	668	411	466	1,231	.260	.334	.426	.759
11	Cubs	.484	784	837	1,621	55,571	7,509	14,562	2,848	303	1,896	7,159	5,261	463	10,999	759	362	62,493	23,704	5,047	775	423	470	1,254	.262	.329	.427	.755
12	Rangers	.490	793	827	1,620	56,483	8,668	15,524	3,141	304	2,168	8,272	5,379	524	10,600	763	339	63,206	25,777	5,613	328	492	333	1,311	.275	.341	.456	.797
13	Padres	.495	803	818	1,621	55,235	7,264	14,187	2,793	316	1,503	6,900	5,914	451	11,046	989	408	62,566	22,121	4,612	502	464	402	1,252	.257	.331	.400	.732
14	Blue Jays	.504	816	803	1,620	56,048	8,090	15,093	3,219	285	1,894	7,722	5,252	710	10,540	908	382	62,744	24,564	5,398	252	482	327	1,312	.269	.337	.438	.775
15	Phillies	.505	817	802	1,619	55,849	7,913	14,789	3,042	357	1,737	7,513	6,143	585	11,277	1,099	327	63,679	23,756	5,136	633	469	576	1,175	.265	.341	.425	.767
16	Diamondbacks	.505	818	802	1,620	55,486	7,515	14,493	2,879	402	1,736	7,179	5,456	537	10,525	851	355	62,564	23,384	5,017	606	479	489	1,220	.261	.331	.421	.752
17	Twins	.508	821	796	1,618	55,859	7,495	15,067	3,016	356	1,408	7,052	5,041	533	9,784	1,070	494	62,236	23,019	4,780	320	483	378	1,430	.270	.333	.412	.745
18	Mets	.519	841	778	1,619	55,064	7,384	14,319	2,825	242	1,683	7,013	5,578	537	10,507	1,107	418	62,337	22,677	4,750	718	440	527	1,259	.260	.332	.412	.743
19	Dodgers	.520	843	777	1,620	55,229	7,306	14,373	2,630	303	1,676	6,975	5,252	541	10,165	1,089	453	62,125	22,637	4,609	676	427	422	1,228	.260	.328	.410	.738
20	White Sox	.521	844	775	1,621	55,489	8,228	14,935	2,883	267	2,095	7,871	5,203	545	9,789	1,017	468	62,213	24,637	5,245	483	493	277	1,265	.269	.335	.444	.779
21	Mariners	.523	846	773	1,619	56,090	8,108	15,331	2,884	295	1,727	7,699	5,523	540	10,109	1,185	433	63,076	23,986	4,906	415	508	428	1,232	.273	.341	.428	.769
22	Indians	.528	856	764	1,620	56,036	8,473	15,286	3,136	294	1,955	8,097	5,898	600	10,863	903	438	63,455	24,875	5,385	407	514	367	1,308	.273	.346	.444	.789
23	Angels	.530	858	762	1,620	55,930	7,825	15,271	2,938	293	1,592	7,431	4,951	529	9,305	1,210	521	62,345	23,571	4,823	444	491	414	1,242	.273	.335	.421	.757
24	Astros	.538	871	749	1,621	55,366	7,990	14,717	2,963	303	1,838	7,607	5,952	697	10,804	984	427	63,241	23,800	5,104	747	479	510	1,332	.266	.342	.430	.772
25	Giants	.538	870	748	1,619	55,293	7,907	14,732	2,965	340	1,793	7,530	6,079	523	9,704	765	362	63,151	23,756	5,098	782	474	743	1,324	.266	.342	.430	.772