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	Rockies	2342-2768	33	.458	5,110	2,342	2,768	175,486	25,232	47,373	9,359	1,321	5,772	23,995	16,088	1,596	38,123	3,085	1,379	196,542	76,690	16,452	2,007	1,365	1,209	3,900	.270	.334	.437	.771
3	Marlins	2343-2757	33	.459	5,100	2,343	2,757	173,368	21,462	44,171	8,402	991	4,643	20,352	15,670	1,840	38,604	3,281	1,305	193,889	68,484	14,036	1,724	1,287	1,205	3,825	.255	.321	.395	.716
4	Padres	4175-4758	57	.467	8,935	4,175	4,758	302,037	36,209	75,301	13,325	1,766	7,293	34,052	28,759	2,136	59,774	6,029	2,610	338,912	114,037	22,384	3,719	2,261	2,693	6,526	.249	.317	.378	.694
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	10260-11363	143	.474	21,738	10,260	11,363	743,787	96,526	193,669	33,481	6,684	14,239	86,742	67,878	5,430	105,685	14,995	2,922	832,039	283,235	54,404	11,921	3,023	3,743	9,885	.260	.326	.381	.706
7	Orioles	9160-10133	125	.475	19,403	9,160	10,133	659,075	83,787	170,049	29,402	4,915	14,486	77,471	63,407	4,495	98,721	10,583	2,791	740,623	252,739	48,803	10,533	3,113	2,582	10,870	.258	.326	.383	.709
8	Rangers	4862-5348	65	.476	10,216	4,862	5,348	348,747	45,950	89,910	16,030	1,895	10,237	43,417	33,029	2,719	65,525	5,986	2,856	390,306	140,441	28,162	2,966	2,845	2,259	7,816	.258	.324	.403	.727
9	Royals	4251-4671	57	.476	8,924	4,251	4,671	305,215	38,977	80,121	14,986	2,295	7,035	36,791	26,094	2,478	52,419	7,119	2,909	338,842	120,802	24,316	2,379	2,676	1,873	6,804	.263	.323	.396	.719
10	Mariners	3647-3992	49	.477	7,641	3,647	3,992	260,678	33,920	66,981	12,483	1,260	7,784	32,228	24,691	2,375	50,105	5,057	2,178	291,785	105,336	21,527	1,954	2,087	1,676	5,709	.257	.324	.404	.729
11	Twins	9302-10002	125	.482	19,413	9,302	10,002	662,224	85,352	173,634	29,816	6,335	12,073	78,588	62,487	5,185	94,834	12,034	3,087	743,260	252,339	48,224	10,191	3,173	2,665	11,000	.262	.329	.381	.710
12	Nationals	4302-4622	57	.482	8,928	4,302	4,622	301,977	37,417	76,623	14,782	1,795	7,642	35,173	28,378	2,643	57,483	6,578	2,791	339,180	117,921	24,219	3,886	2,296	2,890	6,529	.254	.321	.390	.712
13	Mets	4868-5187	64	.484	10,063	4,868	5,187	340,440	41,528	85,057	15,192	1,819	8,644	39,112	32,547	2,889	65,300	5,920	2,739	382,498	129,819	25,655	3,991	2,631	3,146	7,493	.250	.318	.381	.700
14	Athletics	9366-9914	125	.486	19,367	9,366	9,914	656,449	85,465	168,948	29,272	5,337	14,194	78,763	64,663	4,746	99,434	12,133	3,212	739,655	251,476	48,803	10,686	3,111	2,272	10,659	.257	.327	.383	.710
15	Brewers	4358-4570	57	.488	8,932	4,358	4,570	303,190	39,725	77,637	14,468	1,760	8,751	37,637	29,187	2,727	59,251	6,026	2,747	340,705	121,878	24,979	3,169	2,432	2,162	6,632	.256	.325	.402	.727
16	Diamondbacks	2131-2231	28	.489	4,362	2,131	2,231	148,823	19,966	37,913	7,772	1,076	4,677	19,031	14,496	1,444	32,962	2,527	910	167,317	61,868	13,525	1,332	1,222	1,093	3,109	.255	.324	.416	.740
17	Rays	2140-2220	28	.491	4,360	2,140	2,220	148,243	19,417	37,650	7,494	856	4,553	18,470	14,089	1,691	33,759	3,266	1,243	165,938	60,515	12,903	747	1,168	693	3,054	.254	.323	.408	.732
18	Angels	5064-5161	65	.495	10,228	5,064	5,161	347,021	44,263	88,755	15,339	1,815	9,278	41,653	32,456	2,853	63,158	6,065	3,112	388,651	135,558	26,432	3,542	2,779	2,491	7,901	.256	.322	.391	.713
19	White Sox	9624-9672	125	.499	19,399	9,624	9,672	656,798	84,222	170,490	28,278	5,558	12,319	77,420	62,238	5,258	92,443	13,646	3,493	739,904	246,841	46,155	12,377	3,233	2,464	10,544	.260	.327	.376	.703
20	Blue Jays	3813-3826	49	.499	7,642	3,813	3,826	261,823	35,351	68,101	13,599	1,494	8,310	33,532	24,292	2,441	49,230	4,590	1,969	292,203	109,618	23,403	1,511	2,136	1,412	5,960	.260	.326	.419	.745
21	Pirates	10877-10872	144	.500	21,889	10,877	10,872	749,720	97,326	197,297	32,414	8,941	12,280	86,828	64,441	5,542	99,980	15,710	3,280	835,518	284,433	53,635	12,564	3,128	3,703	10,086	.263	.325	.379	.704
22	Astros	5064-5000	64	.503	10,069	5,064	5,000	341,719	42,962	87,139	15,972	2,177	8,483	40,435	32,466	2,922	63,248	7,172	3,143	383,865	132,914	26,632	4,031	2,727	3,147	7,445	.255	.323	.389	.712
23	Tigers	9733-9601	125	.503	19,427	9,733	9,601	662,475	89,226	175,007	29,660	6,307	14,636	82,172	65,679	4,467	97,089	11,303	2,941	746,755	261,189	50,603	11,010	3,124	2,450	10,735	.264	.333	.394	.727
24	Braves	11153-10999	150	.503	22,306	11,153	10,999	763,695	99,674	198,318	32,165	6,304	15,097	86,716	67,648	5,080	100,517	14,110	3,071	851,999	288,382	53,566	12,686	2,890	3,661	10,409	.260	.323	.378	.701
25	Reds	10980-10810	144	.504	21,929	10,980	10,810	747,161	98,405	194,651	32,450	7,565	14,368	87,537	66,836	5,517	102,634	18,180	3,414	835,399	285,335	54,383	12,666	3,051	3,649	9,749	.261	.325	.382	.707