The Tampa Bay Devil Rays had the worst winning percentage by a team in 2006, winning 37.7 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	Devil Rays	.377	2006	61	101	162	5,474	689	1,395	267	33	190	650	441	47	1,106	134	52	6,040	2,298	490	35	43	23	101	.255	.314	.420	.733
2	Royals	.383	2006	62	100	162	5,589	757	1,515	335	37	124	718	474	64	1,040	65	34	6,227	2,296	496	52	48	32	130	.271	.332	.411	.743
3	Cubs	.407	2006	66	96	162	5,587	716	1,496	271	46	166	677	395	43	928	121	49	6,146	2,357	483	84	37	24	135	.268	.319	.422	.741
4	Pirates	.414	2006	67	95	162	5,558	691	1,462	286	17	141	656	459	89	1,200	68	23	6,217	2,205	444	62	49	49	153	.263	.327	.397	.723
5	Orioles	.432	2006	70	92	162	5,610	768	1,556	288	20	164	727	474	73	878	121	32	6,238	2,376	472	40	41	35	145	.277	.339	.424	.763
6	Nationals	.438	2006	71	91	162	5,495	746	1,437	322	22	164	695	594	69	1,156	123	62	6,283	2,295	508	76	49	66	118	.262	.338	.418	.756
7	Brewers	.463	2006	75	87	162	5,433	730	1,400	301	20	180	695	502	82	1,233	71	37	6,128	2,281	501	58	53	48	133	.258	.327	.420	.747
8	Rockies	.469	2006	76	86	162	5,562	813	1,504	325	54	157	761	561	60	1,108	85	50	6,347	2,408	536	119	45	64	119	.270	.341	.433	.774
9	Diamondbacks	.469	2006	76	86	162	5,645	773	1,506	331	38	160	743	504	67	965	76	30	6,330	2,393	529	61	53	47	136	.267	.331	.424	.755
10	Giants	.472	2006	76	85	161	5,472	746	1,418	297	52	163	711	494	53	891	58	25	6,136	2,308	512	80	37	76	136	.259	.324	.422	.746
11	Indians	.481	2006	78	84	162	5,619	870	1,576	351	27	196	839	556	54	1,204	55	23	6,302	2,569	574	30	43	42	127	.280	.349	.457	.806
12	Mariners	.481	2006	78	84	162	5,670	756	1,540	266	42	172	703	404	63	974	106	37	6,213	2,406	480	38	38	49	117	.272	.325	.424	.749
13	Marlins	.481	2006	78	84	162	5,502	758	1,454	309	42	182	713	497	74	1,249	110	58	6,191	2,393	533	76	42	55	109	.264	.331	.435	.766
14	Braves	.488	2006	79	83	162	5,583	849	1,510	312	26	222	818	526	52	1,169	52	35	6,283	2,540	560	78	44	48	131	.270	.337	.455	.791
15	Reds	.494	2006	80	82	162	5,515	749	1,419	291	12	217	718	614	59	1,192	124	33	6,292	2,385	520	66	38	52	122	.257	.336	.432	.768
16	Rangers	.494	2006	80	82	162	5,659	835	1,571	357	23	183	799	505	40	1,061	53	24	6,272	2,523	563	18	50	35	148	.278	.338	.446	.784
17	Astros	.506	2006	82	80	162	5,521	735	1,407	275	27	174	708	585	73	1,076	79	36	6,325	2,258	476	100	46	54	122	.255	.332	.409	.741
18	Cardinals	.516	2006	83	78	161	5,522	781	1,484	292	27	184	745	531	61	922	59	32	6,225	2,382	503	71	40	70	129	.269	.337	.431	.769
19	Phillies	.525	2006	85	77	162	5,687	865	1,518	294	41	216	823	626	95	1,203	92	25	6,509	2,542	551	57	44	67	115	.267	.347	.447	.794
20	Red Sox	.531	2006	86	76	162	5,619	820	1,510	327	16	192	777	672	66	1,056	51	23	6,435	2,445	535	22	56	56	136	.269	.351	.435	.786
21	Blue Jays	.537	2006	87	75	162	5,596	809	1,591	348	27	199	778	514	63	906	65	33	6,241	2,590	574	16	52	31	166	.284	.348	.463	.811
22	Dodgers	.543	2006	88	74	162	5,628	820	1,552	307	58	153	787	601	51	959	128	49	6,394	2,434	518	66	48	61	140	.276	.348	.432	.781
23	Padres	.543	2006	88	74	162	5,576	731	1,465	298	38	161	698	564	40	1,104	123	31	6,286	2,322	497	59	47	37	127	.263	.332	.416	.749
24	Angels	.549	2006	89	73	162	5,609	766	1,539	309	29	159	737	486	42	914	148	57	6,221	2,383	497	31	53	49	126	.274	.334	.425	.759
25	White Sox	.556	2006	90	72	162	5,657	868	1,586	291	20	236	839	502	58	1,056	93	48	6,318	2,625	547	44	57	33	118	.280	.342	.464	.806