The Kansas City Royals had the lowest winning percentage by a team in 2005, winning 34.6 percent of the time.

	TEAM	W%	SEASON	W	L	G	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	.346	2005	56	106	162	5,503	701	1,445	289	34	126	653	424	63	1,008	53	33	6,086	2,180	449	46	50	23	139	.263	.320	.396	.716
2	Pirates	.414	2005	67	95	162	5,573	680	1,445	292	38	139	656	471	72	1,092	73	30	6,221	2,230	469	56	49	38	130	.259	.322	.400	.723
3	Rockies	.414	2005	67	95	162	5,542	740	1,477	280	34	150	704	509	64	1,103	65	32	6,237	2,275	464	88	34	36	125	.267	.333	.411	.744
4	Devil Rays	.414	2005	67	95	162	5,552	750	1,519	289	40	157	717	412	69	990	151	49	6,118	2,359	486	34	51	25	133	.274	.329	.425	.754
5	Mariners	.426	2005	69	93	162	5,507	699	1,408	289	34	130	657	466	48	986	102	47	6,095	2,155	453	37	37	50	115	.256	.317	.391	.709
6	Dodgers	.438	2005	71	91	162	5,433	685	1,374	284	21	149	653	541	67	1,094	58	35	6,131	2,147	454	57	33	30	139	.253	.326	.395	.721
7	Tigers	.438	2005	71	91	162	5,602	723	1,521	283	45	168	678	384	53	1,038	66	28	6,135	2,398	496	44	52	24	137	.272	.321	.428	.750
8	Reds	.451	2005	73	89	163	5,565	820	1,453	335	15	222	784	611	62	1,303	72	23	6,320	2,484	572	43	39	42	116	.261	.339	.446	.785
9	Orioles	.457	2005	74	88	162	5,551	729	1,492	296	27	189	700	447	54	902	83	37	6,134	2,409	512	40	42	31	145	.269	.327	.434	.761
10	Giants	.463	2005	75	87	162	5,462	649	1,427	299	26	128	617	431	49	901	71	35	6,077	2,162	453	91	44	26	147	.261	.319	.396	.714
11	Diamondbacks	.475	2005	77	85	162	5,550	696	1,419	291	27	191	670	606	55	1,094	67	26	6,327	2,337	509	71	45	51	132	.256	.332	.421	.754
12	Cubs	.488	2005	79	83	162	5,584	703	1,506	323	23	194	674	419	50	920	65	39	6,159	2,457	540	69	37	49	131	.270	.324	.440	.764
13	Rangers	.488	2005	79	83	162	5,716	865	1,528	311	29	260	834	495	48	1,112	67	15	6,300	2,677	600	9	32	20	123	.267	.329	.468	.798
14	Blue Jays	.494	2005	80	82	162	5,581	775	1,480	307	39	136	735	486	89	955	72	35	6,233	2,273	482	21	56	18	126	.265	.331	.407	.738
15	Nationals	.500	2005	81	81	162	5,426	639	1,367	311	32	117	615	491	89	1,090	45	45	6,142	2,093	460	91	45	55	130	.252	.322	.386	.708
16	Brewers	.500	2005	81	81	162	5,448	726	1,413	327	19	175	689	531	73	1,162	79	34	6,156	2,303	521	66	38	55	137	.259	.331	.423	.754
17	Padres	.506	2005	82	80	162	5,502	684	1,416	269	39	130	655	600	49	977	99	44	6,271	2,153	438	72	48	41	122	.257	.333	.391	.724
18	Twins	.512	2005	83	79	162	5,564	688	1,441	269	32	134	644	485	59	978	102	44	6,192	2,176	435	42	42	49	155	.259	.323	.391	.714
19	Mets	.512	2005	83	79	162	5,505	722	1,421	279	32	175	683	486	48	1,075	153	40	6,146	2,289	486	69	38	49	103	.258	.322	.416	.738
20	Marlins	.512	2005	83	79	162	5,502	717	1,499	306	32	128	678	512	67	918	96	38	6,213	2,253	466	82	50	61	144	.272	.339	.409	.748
21	Phillies	.543	2005	88	74	162	5,542	807	1,494	282	35	167	760	639	56	1,083	116	27	6,345	2,347	484	62	46	76	107	.270	.348	.423	.772
22	Athletics	.543	2005	88	74	162	5,627	772	1,476	310	20	155	739	537	52	819	31	22	6,275	2,291	485	19	40	22	148	.262	.330	.407	.737
23	Astros	.549	2005	89	73	163	5,462	693	1,400	281	32	161	654	481	72	1,037	115	44	6,139	2,228	474	82	42	43	116	.256	.322	.408	.730
24	Braves	.556	2005	90	72	162	5,486	769	1,453	308	37	184	733	534	45	1,084	92	32	6,186	2,387	529	75	46	56	146	.265	.333	.435	.768
25	Indians	.574	2005	93	69	162	5,609	790	1,522	337	30	207	760	503	54	1,093	62	36	6,255	2,540	574	39	50	33	128	.271	.334	.453	.787