Between the 1980 and 1989 seasons, the Seattle Mariners had the worst record by a team in a decade, with a record of 673-893 in the 1980s.

	TEAM	REC	DECADE	W%	G	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Mariners	673-893	1980s	.430	1,568	673	893	53,252	6,482	13,564	2,419	329	1,335	6,109	4,833	325	8,375	1,144	636	59,298	20,646	4,083	488	400	322	1,181	.255	.318	.388	.706
2	Indians	710-849	1980s	.455	1,561	710	849	53,458	6,889	14,182	2,314	323	1,167	6,442	5,168	283	7,673	1,207	592	59,939	20,643	3,804	511	519	379	1,270	.265	.330	.386	.717
3	Braves	712-845	1980s	.457	1,559	712	845	52,686	6,275	13,184	2,208	264	1,235	5,859	5,095	233	8,482	1,086	660	59,136	19,625	3,707	732	390	603	1,192	.250	.317	.372	.689
4	Rangers	720-839	1980s	.462	1,562	720	839	53,286	6,636	13,946	2,326	334	1,255	6,219	4,737	286	8,308	984	583	59,225	20,705	3,915	473	443	350	1,274	.262	.323	.389	.711
5	Twins	733-833	1980s	.468	1,567	733	833	53,485	6,818	14,086	2,541	381	1,350	6,436	4,621	309	7,853	697	451	59,302	21,439	4,272	423	464	377	1,307	.263	.323	.401	.724
6	Pirates	732-825	1980s	.470	1,560	732	825	53,121	6,313	13,627	2,481	374	1,051	5,936	4,846	225	8,376	1,388	699	59,434	20,009	3,906	751	491	646	1,131	.257	.319	.377	.695
7	Cubs	735-821	1980s	.472	1,561	735	821	53,407	6,571	13,736	2,378	378	1,293	6,151	4,759	215	9,025	1,214	543	59,461	20,749	4,049	644	436	588	1,073	.257	.318	.389	.707
8	White Sox	758-802	1980s	.486	1,563	758	802	52,998	6,780	13,680	2,364	375	1,298	6,374	4,659	366	8,360	1,120	515	59,078	20,688	4,037	574	481	405	1,161	.258	.320	.390	.710
9	Padres	762-805	1980s	.486	1,569	762	805	53,169	6,197	13,568	2,105	374	954	5,753	4,877	199	8,448	1,431	662	59,475	19,283	3,433	826	404	692	1,161	.255	.318	.363	.681
10	Giants	773-795	1980s	.493	1,568	773	795	53,100	6,448	13,300	2,236	344	1,218	6,014	5,242	276	9,505	1,166	695	59,779	19,878	3,798	761	400	653	1,097	.250	.319	.374	.693
11	Reds	781-783	1980s	.499	1,566	781	783	52,936	6,431	13,371	2,385	319	1,172	5,975	5,184	232	8,860	1,499	585	59,492	19,910	3,876	691	449	596	1,164	.253	.320	.376	.696
12	Angels	783-783	1980s	.500	1,566	783	783	53,345	7,077	13,771	2,264	287	1,454	6,606	5,417	347	8,501	826	468	60,312	20,971	4,005	746	457	406	1,276	.258	.328	.393	.721
13	Phillies	783-780	1980s	.501	1,566	783	780	53,069	6,633	13,519	2,352	404	1,263	6,220	5,295	294	9,226	1,304	577	59,735	20,468	4,019	627	450	588	1,173	.255	.323	.386	.709
14	Athletics	803-764	1980s	.512	1,567	803	764	53,138	7,087	13,647	2,213	284	1,469	6,628	5,318	291	8,843	1,567	669	59,822	20,835	3,966	546	529	329	1,189	.257	.325	.392	.717
15	Orioles	800-761	1980s	.512	1,562	800	761	53,075	7,001	13,707	2,312	225	1,611	6,621	5,634	240	8,235	702	400	59,799	21,302	4,148	414	436	375	1,396	.258	.330	.401	.731
16	Brewers	804-760	1980s	.514	1,565	804	760	53,875	7,208	14,353	2,531	376	1,373	6,807	4,630	290	7,732	1,076	525	59,825	21,755	4,280	532	498	417	1,176	.266	.325	.404	.729
17	Expos	811-752	1980s	.519	1,565	811	752	53,182	6,375	13,556	2,539	420	1,081	5,947	4,953	295	8,519	1,677	665	59,551	20,178	4,040	684	437	704	1,081	.255	.319	.379	.699
18	Astros	819-750	1980s	.522	1,569	819	750	53,267	6,208	13,507	2,309	438	931	5,811	4,869	212	8,204	1,447	644	59,547	19,485	3,678	741	458	639	984	.254	.316	.366	.682
19	Blue Jays	817-746	1980s	.523	1,565	817	746	53,883	7,056	14,219	2,570	460	1,457	6,611	4,713	328	8,227	1,206	629	59,725	22,080	4,487	365	436	374	1,154	.264	.324	.410	.734
20	Mets	816-743	1980s	.523	1,561	816	743	52,968	6,482	13,474	2,306	298	1,207	6,040	5,014	261	9,108	1,380	571	59,362	19,997	3,811	658	461	652	1,089	.254	.319	.378	.697
21	Red Sox	821-742	1980s	.525	1,564	821	742	54,272	7,586	15,083	2,803	308	1,423	7,162	5,465	355	7,407	526	346	61,066	22,771	4,534	479	495	438	1,482	.278	.345	.420	.765
22	Dodgers	825-741	1980s	.527	1,568	825	741	53,186	6,175	13,462	2,126	240	1,188	5,794	4,786	260	8,521	1,253	603	59,545	19,632	3,554	887	426	629	1,080	.253	.316	.369	.685
23	Cardinals	825-734	1980s	.529	1,562	825	734	52,938	6,574	13,737	2,367	489	759	6,103	5,247	213	8,250	2,045	714	59,652	19,359	3,615	791	463	607	1,100	.259	.326	.366	.692
24	Royals	826-734	1980s	.529	1,561	826	734	53,548	6,809	14,267	2,538	467	1,215	6,461	4,558	291	8,074	1,347	497	59,206	21,384	4,220	357	452	419	1,221	.266	.325	.399	.724
25	Tigers	839-727	1980s	.536	1,567	839	727	53,675	7,347	14,081	2,327	380	1,612	6,899	5,594	332	8,387	937	533	60,556	22,004	4,319	482	473	383	1,128	.262	.333	.410	.743