The Louisville Colonels had the worst record by a team when playing 10+ seasons, with a record of 993-1320.

Interpreted as:

worst record in 10 or more years

	TEAM	REC	SEAS	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	Colonels	993-1320	18	.429	2,355	993	1,320	82,256	12,464	21,505	2,816	1,292	436	8,508	6,080	757	3,638	3,474		89,787	28,213	4,544	609				.261	.319	.343	.662
2	Marlins	2322-2737	33	.459	5,059	2,322	2,737	171,960	21,288	43,808	8,334	984	4,609	20,184	15,549	1,834	38,291	3,254	1,294	192,336	67,937	13,927	1,717	1,276	1,203	3,798	.255	.321	.395	.716
3	Rockies	2329-2739	33	.460	5,068	2,329	2,739	174,055	25,070	47,020	9,286	1,308	5,728	23,840	15,987	1,581	37,725	3,056	1,366	194,983	76,106	16,322	2,003	1,357	1,209	3,864	.270	.335	.437	.772
4	Padres	4154-4736	57	.467	8,892	4,154	4,736	300,599	36,045	74,967	13,263	1,760	7,259	33,894	28,614	2,125	59,461	6,004	2,603	337,296	113,527	22,282	3,710	2,248	2,686	6,502	.249	.317	.378	.695
5	Spiders	827-938	13	.469	1,802	827	938	63,232	10,057	17,006	2,308	961	292	8,238	5,871	580	3,144	2,800		70,233	22,112	3,561	550				.269	.337	.350	.686
6	Phillies	10237-11344	143	.474	21,696	10,237	11,344	742,379	96,345	193,322	33,417	6,679	14,192	86,570	67,746	5,411	105,345	14,959	2,914	830,467	282,673	54,288	11,916	3,015	3,739	9,863	.260	.326	.381	.706
7	Orioles	9135-10116	125	.475	19,361	9,135	10,116	657,646	83,591	169,693	29,326	4,912	14,434	77,287	63,287	4,476	98,353	10,548	2,782	739,041	252,145	48,672	10,531	3,101	2,575	10,842	.258	.326	.383	.709
8	Rangers	4843-5326	65	.476	10,175	4,843	5,326	347,340	45,778	89,587	15,966	1,892	10,198	43,256	32,892	2,699	65,181	5,944	2,847	388,726	139,931	28,056	2,963	2,832	2,250	7,795	.258	.324	.403	.727
9	Royals	4235-4646	57	.477	8,883	4,235	4,646	303,831	38,837	79,783	14,915	2,291	7,003	36,653	26,001	2,458	52,137	7,090	2,898	337,328	120,289	24,209	2,369	2,669	1,868	6,779	.263	.323	.396	.719
10	Mariners	3626-3970	49	.477	7,598	3,626	3,970	259,176	33,739	66,592	12,419	1,258	7,728	32,052	24,573	2,351	49,728	5,021	2,170	290,123	104,711	21,405	1,947	2,076	1,664	5,680	.257	.325	.404	.729
11	Twins	9285-9976	125	.482	19,370	9,285	9,976	660,780	85,172	173,295	29,756	6,333	12,016	78,413	62,357	5,159	94,469	12,014	3,079	741,650	251,765	48,105	10,189	3,165	2,663	10,970	.262	.329	.381	.710
12	Nationals	4287-4596	57	.483	8,887	4,287	4,596	300,565	37,232	76,265	14,711	1,789	7,606	34,993	28,260	2,628	57,191	6,549	2,778	337,619	117,372	24,106	3,879	2,287	2,881	6,501	.254	.321	.391	.712
13	Mets	4845-5168	64	.484	10,021	4,845	5,168	339,027	41,339	84,710	15,135	1,817	8,578	38,924	32,414	2,860	64,963	5,887	2,735	380,908	129,213	25,530	3,988	2,619	3,137	7,462	.250	.318	.381	.699
14	Athletics	9351-9886	125	.486	19,324	9,351	9,886	654,998	85,288	168,595	29,201	5,332	14,141	78,591	64,508	4,734	99,021	12,109	3,207	738,025	250,883	48,674	10,682	3,103	2,269	10,619	.257	.327	.383	.710
15	Brewers	4332-4555	57	.487	8,891	4,332	4,555	301,783	39,513	77,263	14,402	1,756	8,705	37,434	29,047	2,710	58,926	5,985	2,731	339,118	121,292	24,863	3,163	2,415	2,158	6,609	.256	.325	.402	.726
16	Diamondbacks	2113-2208	28	.489	4,321	2,113	2,208	147,431	19,760	37,567	7,717	1,066	4,614	18,828	14,369	1,423	32,624	2,508	902	165,754	61,258	13,397	1,325	1,206	1,091	3,083	.255	.325	.416	.740
17	Rays	2113-2205	28	.489	4,318	2,113	2,205	146,805	19,171	37,245	7,421	850	4,492	18,238	13,963	1,674	33,420	3,212	1,225	164,336	59,842	12,763	737	1,157	685	3,027	.254	.323	.408	.731
18	Angels	5043-5140	65	.495	10,186	5,043	5,140	345,596	44,076	88,420	15,287	1,810	9,218	41,474	32,319	2,824	62,744	6,046	3,100	387,046	134,981	26,315	3,537	2,770	2,484	7,877	.256	.322	.391	.713
19	Blue Jays	3784-3812	49	.498	7,599	3,784	3,812	260,346	35,121	67,702	13,530	1,491	8,258	33,314	24,139	2,423	48,975	4,574	1,963	290,534	108,988	23,279	1,501	2,125	1,401	5,927	.260	.326	.419	.745
20	White Sox	9609-9646	125	.499	19,358	9,609	9,646	655,440	84,070	170,178	28,206	5,550	12,286	77,278	62,091	5,248	92,081	13,626	3,482	738,367	246,342	46,042	12,368	3,220	2,461	10,520	.260	.327	.376	.703
21	Pirates	10855-10852	144	.500	21,847	10,855	10,852	748,327	97,159	196,951	32,348	8,934	12,252	86,668	64,322	5,531	99,609	15,684	3,269	833,978	283,923	53,534	12,560	3,115	3,699	10,057	.263	.325	.379	.704
22	Astros	5034-4988	64	.502	10,027	5,034	4,988	340,276	42,757	86,739	15,908	2,172	8,423	40,240	32,357	2,899	62,927	7,149	3,135	382,275	132,260	26,503	4,030	2,713	3,144	7,408	.255	.323	.389	.711
23	Tigers	9708-9584	125	.503	19,385	9,708	9,584	661,066	89,032	174,660	29,591	6,295	14,582	81,985	65,549	4,446	96,729	11,292	2,937	745,178	260,587	50,468	11,009	3,108	2,447	10,717	.264	.333	.394	.727
24	Braves	11138-10973	150	.504	22,265	11,138	10,973	762,312	99,515	197,988	32,111	6,301	15,056	86,562	67,502	5,067	100,147	14,098	3,067	850,445	287,869	53,468	12,684	2,880	3,655	10,383	.260	.323	.378	.701
25	Reds	10959-10791	144	.504	21,889	10,959	10,791	745,821	98,217	194,317	32,391	7,558	14,325	87,362	66,711	5,506	102,297	18,166	3,406	833,905	284,799	54,274	12,662	3,037	3,646	9,719	.261	.325	.382	.707