The Baltimore Orioles had the lowest winning percentage by a team in 2018, winning 29.0 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	Orioles	.290	2018	47	115	162	5,507	622	1,317	242	15	188	593	422	57	1,412	81	22	6,034	2,153	445	13	35	19	132	.239	.298	.391	.689
2	Royals	.358	2018	58	104	162	5,505	638	1,350	283	29	155	606	427	67	1,310	117	38	6,063	2,156	467	24	40	13	123	.245	.305	.392	.697
3	White Sox	.383	2018	62	100	162	5,523	656	1,332	259	40	182	639	425	66	1,594	98	41	6,070	2,217	481	24	32	18	99	.241	.302	.401	.703
4	Marlins	.391	2018	63	98	161	5,488	589	1,303	222	24	128	554	455	73	1,384	45	31	6,079	1,957	374	32	31	26	119	.237	.303	.357	.659
5	Tigers	.395	2018	64	98	162	5,494	630	1,326	284	35	135	597	428	52	1,341	70	30	6,029	2,085	454	15	40	18	110	.241	.300	.380	.680
6	Padres	.407	2018	66	96	162	5,486	617	1,289	250	30	162	583	471	31	1,523	95	36	6,059	2,085	442	35	36	28	122	.235	.297	.380	.677
7	Reds	.414	2018	67	95	162	5,532	696	1,404	251	25	172	665	559	65	1,376	77	33	6,240	2,221	448	49	35	35	128	.254	.328	.401	.729
8	Rangers	.414	2018	67	95	162	5,453	737	1,308	266	24	194	696	555	88	1,484	74	35	6,163	2,204	484	33	34	16	104	.240	.318	.404	.722
9	Giants	.451	2018	73	89	162	5,541	603	1,324	255	30	133	573	448	49	1,467	77	34	6,113	2,038	418	33	42	40	113	.239	.300	.368	.667
10	Blue Jays	.451	2018	73	89	162	5,477	709	1,336	320	16	217	680	499	58	1,387	47	30	6,076	2,339	553	5	37	15	118	.244	.312	.427	.739
11	Mets	.475	2018	77	85	162	5,468	676	1,282	265	34	170	649	566	73	1,404	71	39	6,177	2,125	469	28	42	36	116	.234	.312	.389	.701
12	Twins	.481	2018	78	84	162	5,526	738	1,379	317	22	166	704	534	37	1,328	47	27	6,154	2,238	505	19	38	25	89	.250	.318	.405	.723
13	Phillies	.494	2018	80	82	162	5,425	677	1,270	241	30	186	653	582	64	1,520	69	26	6,135	2,129	457	32	32	33	102	.234	.314	.392	.706
14	Angels	.494	2018	80	82	162	5,472	721	1,323	249	23	214	690	514	73	1,300	89	22	6,105	2,260	486	7	39	38	111	.242	.313	.413	.726
15	Nationals	.506	2018	82	80	162	5,517	771	1,402	284	25	191	737	631	59	1,289	119	33	6,288	2,309	500	41	40	56	104	.254	.335	.419	.753
16	Diamondbacks	.506	2018	82	80	162	5,460	693	1,283	259	50	176	658	560	52	1,460	79	25	6,155	2,170	485	38	45	36	110	.235	.310	.397	.707
17	Pirates	.509	2018	82	79	161	5,447	692	1,381	290	38	157	665	474	59	1,229	70	38	6,063	2,218	485	31	52	38	121	.254	.317	.407	.725
18	Cardinals	.543	2018	88	74	162	5,498	759	1,369	248	9	205	725	525	80	1,380	63	32	6,197	2,250	462	46	48	40	92	.249	.321	.409	.730
19	Mariners	.549	2018	89	73	162	5,513	677	1,402	256	32	176	644	430	70	1,221	79	37	6,083	2,250	464	29	41	17	128	.254	.314	.408	.722
20	Braves	.556	2018	90	72	162	5,582	759	1,433	314	29	175	717	511	66	1,290	90	36	6,251	2,330	518	49	43	53	99	.257	.324	.417	.742
21	Rays	.556	2018	90	72	162	5,475	716	1,415	274	43	150	664	540	101	1,388	128	51	6,194	2,225	467	28	50	17	122	.258	.333	.406	.740
22	Rockies	.558	2018	91	72	163	5,541	780	1,418	280	42	210	748	507	51	1,397	95	33	6,178	2,412	532	42	37	38	114	.256	.322	.435	.757
23	Indians	.562	2018	91	71	162	5,595	818	1,447	297	19	216	786	554	80	1,189	135	36	6,298	2,430	532	25	44	32	98	.259	.332	.434	.766
24	Dodgers	.564	2018	92	71	163	5,572	804	1,394	296	33	235	756	647	61	1,436	75	24	6,358	2,461	564	39	39	47	119	.250	.333	.442	.774
25	Cubs	.583	2018	95	68	163	5,624	761	1,453	286	34	167	722	576	78	1,388	66	38	6,364	2,308	487	40	46	67	107	.258	.333	.410	.744