Since 2003, the Kansas City Royals have the worst record by a team, with a record of 1615-2009.

	TEAM	REC	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	Royals	1615-2009	.446	3,624	1,615	2,009	123,674	15,544	32,049	6,288	778	3,173	14,753	9,597	1,276	24,975	2,491	866	136,324	49,412	10,239	770	1,007	528	2,802	.259	.317	.400	.716
2	Rockies	1624-2001	.448	3,625	1,624	2,001	123,957	17,107	32,609	6,591	884	3,987	16,333	11,320	1,104	29,178	1,917	805	138,601	52,929	11,462	1,306	914	800	2,706	.263	.328	.427	.755
3	Pirates	1635-1985	.452	3,621	1,635	1,985	122,642	14,966	30,620	6,115	699	3,272	14,294	10,878	1,469	28,215	1,883	802	136,996	47,949	10,086	1,108	899	744	2,619	.250	.316	.391	.707
4	Orioles	1676-1947	.463	3,624	1,676	1,947	124,400	16,272	31,955	6,223	453	4,264	15,556	10,341	1,252	26,932	1,794	656	137,476	51,876	10,940	564	919	521	2,743	.257	.318	.417	.735
5	Marlins	1676-1945	.463	3,621	1,676	1,945	122,993	15,121	31,118	6,004	692	3,386	14,358	10,678	1,327	28,501	2,182	812	137,040	48,664	10,082	1,171	871	794	2,704	.253	.317	.396	.713
6	White Sox	1712-1912	.472	3,624	1,712	1,912	123,198	15,866	31,302	5,867	477	4,110	15,217	10,278	1,402	27,350	1,956	863	136,474	50,453	10,454	723	873	478	2,801	.254	.317	.410	.726
7	Reds	1715-1909	.473	3,625	1,715	1,909	122,644	16,041	30,626	6,025	540	4,149	15,313	11,900	1,536	29,197	2,272	828	138,130	50,178	10,714	1,183	867	769	2,526	.250	.322	.409	.731
8	Nationals	1726-1896	.477	3,622	1,726	1,896	122,393	15,703	31,070	6,250	582	3,630	14,953	11,572	1,339	27,171	2,277	828	137,456	49,374	10,462	1,223	929	842	2,742	.254	.323	.403	.726
9	Diamondbacks	1727-1897	.477	3,624	1,727	1,897	123,472	16,294	31,171	6,521	883	3,832	15,547	11,882	1,204	28,244	2,115	725	138,627	50,954	11,236	1,054	1,015	853	2,590	.252	.322	.413	.734
10	Tigers	1728-1892	.477	3,620	1,728	1,892	124,071	16,221	32,238	6,141	836	3,809	15,527	10,695	1,113	27,961	1,575	691	137,471	51,478	10,786	626	966	611	2,766	.260	.322	.415	.737
11	Padres	1757-1868	.485	3,625	1,757	1,868	122,155	15,151	30,156	5,859	643	3,493	14,406	11,764	1,168	28,187	2,219	761	137,136	47,780	9,995	1,110	939	740	2,585	.247	.317	.391	.708
12	Mariners	1765-1859	.487	3,624	1,765	1,859	123,344	15,449	30,747	5,785	489	3,822	14,706	10,950	1,385	27,960	2,226	791	137,179	48,976	10,096	636	864	639	2,582	.249	.316	.397	.713
13	Rangers	1802-1823	.497	3,625	1,802	1,823	124,180	17,370	32,060	6,311	585	4,417	16,552	11,104	1,325	27,666	2,294	781	138,210	52,792	11,313	615	986	587	2,521	.258	.323	.425	.748
14	Twins	1806-1820	.498	3,626	1,806	1,820	124,118	16,666	32,011	6,391	658	3,818	15,820	11,602	1,289	26,853	1,860	713	138,615	51,172	10,867	616	990	656	2,804	.258	.325	.412	.738
15	Mets	1808-1815	.499	3,623	1,808	1,815	122,786	15,929	30,915	6,149	604	3,868	15,234	11,752	1,490	27,167	2,275	686	138,052	49,876	10,621	1,101	923	920	2,661	.252	.322	.406	.729
16	Athletics	1810-1813	.500	3,623	1,810	1,813	123,068	16,057	30,468	6,316	516	3,902	15,301	12,180	1,256	27,109	1,800	575	137,944	49,522	10,734	473	967	494	2,817	.248	.319	.402	.722
17	Blue Jays	1830-1793	.505	3,623	1,830	1,793	123,721	17,027	31,837	6,699	491	4,397	16,278	11,673	1,294	26,252	1,666	628	138,159	52,709	11,587	502	969	497	2,922	.257	.325	.426	.752
18	Cubs	1841-1781	.508	3,623	1,841	1,781	123,177	16,283	31,218	6,337	650	4,074	15,508	11,665	1,437	28,639	1,899	766	138,200	51,077	11,061	1,045	876	786	2,639	.253	.323	.415	.738
19	Angels	1850-1774	.510	3,624	1,850	1,774	123,265	16,455	31,643	5,996	574	3,928	15,651	10,931	1,300	26,127	2,418	920	137,158	50,571	10,498	684	978	772	2,805	.257	.321	.410	.732
20	Rays	1850-1774	.510	3,624	1,850	1,774	122,897	16,230	30,995	6,196	713	3,962	15,457	11,800	1,445	29,008	2,843	996	137,668	50,503	10,871	529	997	569	2,445	.252	.323	.411	.734
21	Giants	1851-1771	.511	3,622	1,851	1,771	123,038	15,481	31,090	6,241	750	3,349	14,709	11,292	1,175	26,514	1,625	670	137,618	48,878	10,340	1,118	995	1,006	2,817	.253	.319	.397	.716
22	Brewers	1860-1764	.513	3,624	1,860	1,764	122,485	16,279	30,803	6,189	601	4,200	15,538	11,964	1,522	29,500	2,557	814	137,888	50,794	10,990	1,040	877	803	2,711	.251	.324	.415	.738
23	Astros	1867-1755	.515	3,623	1,867	1,755	123,149	16,360	31,540	6,303	535	4,106	15,604	11,374	1,338	26,601	2,098	802	137,765	51,231	10,944	960	944	662	2,839	.256	.323	.416	.739
24	Guardians	1879-1742	.519	3,621	1,879	1,742	123,188	16,564	31,478	6,633	552	3,829	15,792	11,881	1,432	26,791	2,268	781	138,256	50,702	11,014	715	1,040	696	2,666	.256	.326	.412	.737
25	Phillies	1884-1740	.520	3,624	1,884	1,740	123,849	16,734	31,501	6,251	701	4,138	15,983	12,092	1,400	28,217	2,295	590	139,228	51,568	11,090	1,006	881	981	2,484	.254	.326	.416	.742