The Washington Nationals had the worst record by a team when playing 4+ seasons, with a record of 163-337.

Interpreted as:

worst MLB record over a 4 or more seasons span

	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	Nationals	163-337	4	.326	514	163	337	17,337	2,160	3,944	533	220	125	1,647	1,246	127		1,040		18,710	5,292	878					.227	.284	.305	.589
2	Senators	454-788	9	.366	1,265	454	788	43,645	6,912	11,886	1,615	787	357	5,764	4,269	575	3,492	1,975		48,963	16,146	2,759	474				.272	.345	.370	.715
3	Reds	125-217	5	.365	348	125	217	12,768	1,643	3,191	408	157	30		318					13,086	4,003	595					.250		.314
4	Trojans	134-191	4	.412	330	134	191	11,951	1,542	2,929	456	151	26		414					12,365	3,765	633					.245		.315
5	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
6	Orioles	403-519	8	.437	944	403	519	32,654	4,964	7,699	1,083	504	136	2,635	2,289	208		1,451		35,293	10,198	1,723					.236	.293	.312	.605
7	Blues	242-299	6	.447	549	242	299	19,506	2,437	4,690	836	247	62		676					20,182	6,206	1,145					.240		.318
8	Marlins	2316-2729	33	.459	5,045	2,316	2,729	171,493	21,239	43,693	8,314	979	4,594	20,135	15,504	1,831	38,179	3,239	1,288	191,817	67,747	13,887	1,716	1,273	1,202	3,790	.255	.321	.395	.716
9	Rockies	2327-2727	33	.460	5,054	2,327	2,727	173,588	25,017	46,910	9,261	1,304	5,713	23,787	15,946	1,578	37,596	3,049	1,363	194,467	75,918	16,278	2,002	1,353	1,207	3,852	.270	.335	.437	.772
10	Metropolitans	270-309	5	.466	592	270	309	20,781	3,140	5,100	690	317	88	1,336	1,331	50		425		22,265	6,688	1,095					.245	.296	.322	.618
11	Padres	4149-4728	57	.467	8,879	4,149	4,728	300,147	35,979	74,850	13,246	1,757	7,247	33,835	28,575	2,122	59,371	5,999	2,603	336,796	113,351	22,250	3,709	2,243	2,685	6,494	.249	.317	.378	.695
12	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
13	Phillies	10226-11341	143	.474	21,682	10,226	11,341	741,887	96,272	193,182	33,393	6,677	14,176	86,497	67,701	5,409	105,240	14,948	2,911	829,922	282,457	54,246	11,914	3,011	3,739	9,856	.260	.326	.381	.706
14	Orioles	9133-10104	125	.475	19,347	9,133	10,104	657,165	83,545	169,579	29,304	4,909	14,421	77,242	63,248	4,471	98,215	10,540	2,778	738,512	251,964	48,634	10,530	3,098	2,574	10,832	.258	.326	.383	.709
15	Rangers	4835-5320	65	.476	10,161	4,835	5,320	346,880	45,723	89,483	15,951	1,891	10,178	43,202	32,849	2,693	65,068	5,931	2,845	388,212	139,750	28,020	2,963	2,827	2,250	7,791	.258	.325	.403	.727
16	Royals	4227-4639	57	.477	8,868	4,227	4,639	303,327	38,793	79,656	14,891	2,284	6,997	36,611	25,969	2,455	52,035	7,077	2,893	336,781	120,106	24,172	2,364	2,666	1,865	6,772	.263	.323	.396	.719
17	Mariners	3619-3963	49	.477	7,584	3,619	3,963	258,702	33,686	66,490	12,400	1,258	7,714	31,999	24,529	2,346	49,592	5,014	2,167	289,594	104,548	21,372	1,945	2,072	1,664	5,671	.257	.325	.404	.729
18	Twins	9274-9975	125	.482	19,358	9,274	9,975	660,373	85,111	173,189	29,739	6,331	11,999	78,355	62,326	5,153	94,364	12,008	3,078	741,204	251,587	48,069	10,189	3,163	2,661	10,963	.262	.329	.381	.710
19	Nationals	4281-4588	57	.483	8,873	4,281	4,588	300,108	37,171	76,153	14,686	1,788	7,591	34,935	28,219	2,618	57,083	6,538	2,771	337,105	117,188	24,065	3,877	2,283	2,880	6,490	.254	.321	.390	.712
20	Mets	4838-5161	64	.484	10,007	4,838	5,161	338,586	41,294	84,610	15,115	1,814	8,564	38,881	32,366	2,851	64,850	5,873	2,734	380,404	129,045	25,493	3,986	2,615	3,137	7,446	.250	.318	.381	.699
21	Bisons	314-333	7	.485	656	314	333	23,841	3,474	6,194	1,008	366	105	365	933					24,774	8,249	1,479					.260		.346
22	Athletics	9348-9875	125	.486	19,310	9,348	9,875	654,512	85,231	168,475	29,173	5,332	14,126	78,535	64,471	4,727	98,916	12,098	3,205	737,492	250,690	48,631	10,681	3,101	2,267	10,607	.257	.327	.383	.710
23	Brewers	4325-4548	57	.487	8,877	4,325	4,548	301,337	39,470	77,170	14,383	1,755	8,693	37,392	28,999	2,706	58,803	5,963	2,727	338,616	121,142	24,831	3,160	2,414	2,158	6,606	.256	.325	.402	.727
24	Diamondbacks	2105-2201	28	.489	4,306	2,105	2,201	146,921	19,681	37,428	7,688	1,063	4,588	18,751	14,316	1,415	32,519	2,495	897	165,176	61,006	13,339	1,323	1,201	1,088	3,072	.255	.324	.415	.740
25	Rays	2107-2197	28	.490	4,304	2,107	2,197	146,342	19,117	37,139	7,406	850	4,480	18,187	13,928	1,671	33,299	3,190	1,219	163,829	59,685	12,736	737	1,151	685	3,020	.254	.323	.408	.731