The Philadelphia Phillies had the worst winning percentage by a team in 2015, winning 38.9 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	Phillies	.389	2015	63	99	162	5,529	626	1,374	272	37	130	586	387	54	1,274	88	32	6,052	2,110	439	53	29	20	119	.249	.303	.382	.684
2	Reds	.395	2015	64	98	162	5,571	640	1,382	257	27	167	613	496	42	1,255	134	38	6,196	2,194	451	47	40	38	112	.248	.312	.394	.706
3	Braves	.414	2015	67	95	162	5,420	573	1,361	251	18	100	548	471	44	1,107	69	33	6,033	1,948	369	67	31	39	148	.251	.314	.359	.674
4	Athletics	.420	2015	68	94	162	5,600	694	1,405	277	46	146	661	475	40	1,119	78	29	6,167	2,212	469	14	38	21	124	.251	.312	.395	.707
5	Brewers	.420	2015	68	94	162	5,480	655	1,378	274	34	145	624	412	41	1,299	84	29	6,022	2,155	453	55	34	35	130	.251	.307	.393	.700
6	Rockies	.420	2015	68	94	162	5,572	737	1,479	274	49	186	702	388	33	1,283	97	43	6,071	2,409	509	44	34	47	114	.265	.315	.432	.748
7	Marlins	.438	2015	71	91	162	5,463	613	1,420	236	40	120	575	375	39	1,150	112	45	5,988	2,096	396	71	40	30	133	.260	.310	.384	.694
8	Padres	.457	2015	74	88	162	5,457	650	1,324	260	36	148	623	426	40	1,327	82	29	6,017	2,100	444	52	42	22	108	.243	.300	.385	.685
9	Tigers	.460	2015	74	87	161	5,605	689	1,515	289	49	151	660	455	41	1,259	83	51	6,159	2,355	489	23	35	36	152	.270	.328	.420	.748
10	White Sox	.469	2015	76	86	162	5,533	622	1,381	260	27	136	595	404	65	1,231	68	42	6,069	2,103	423	30	37	22	125	.250	.306	.380	.686
11	Mariners	.469	2015	76	86	162	5,544	656	1,379	262	22	198	624	478	36	1,336	69	45	6,131	2,279	482	38	35	31	123	.249	.311	.411	.722
12	Red Sox	.481	2015	78	84	162	5,640	748	1,495	294	33	161	706	478	46	1,148	71	27	6,236	2,338	488	30	42	28	127	.265	.325	.415	.740
13	Diamondbacks	.488	2015	79	83	162	5,649	720	1,494	289	48	154	680	490	33	1,312	132	44	6,275	2,341	491	46	57	40	134	.264	.324	.414	.738
14	Rays	.494	2015	80	82	162	5,485	644	1,383	278	32	167	612	436	84	1,310	87	45	6,071	2,226	477	19	47	22	121	.252	.314	.406	.720
15	Orioles	.500	2015	81	81	162	5,485	713	1,370	246	20	217	686	418	51	1,331	44	25	6,006	2,307	483	20	32	23	127	.250	.307	.421	.728
16	Indians	.503	2015	81	80	161	5,439	669	1,395	303	29	141	640	533	39	1,157	86	28	6,108	2,179	473	47	50	34	134	.256	.325	.401	.725
17	Twins	.512	2015	83	79	162	5,467	696	1,349	277	44	156	661	439	40	1,264	70	38	6,017	2,182	477	30	41	31	133	.247	.305	.399	.704
18	Nationals	.512	2015	83	79	162	5,428	703	1,363	265	13	177	665	539	44	1,344	57	23	6,117	2,185	455	55	51	38	129	.251	.321	.403	.724
19	Giants	.519	2015	84	78	162	5,565	696	1,486	288	39	136	663	457	49	1,159	93	36	6,153	2,260	463	45	37	30	142	.267	.326	.406	.732
20	Angels	.525	2015	85	77	162	5,417	661	1,331	243	21	176	621	435	58	1,150	52	34	5,987	2,144	440	37	40	34	116	.246	.307	.396	.702
21	Astros	.531	2015	86	76	162	5,459	729	1,363	278	26	230	691	486	56	1,392	121	48	6,072	2,383	534	28	43	22	102	.250	.315	.437	.752
22	Yankees	.537	2015	87	75	162	5,567	764	1,397	272	19	212	737	554	63	1,227	63	25	6,262	2,343	503	24	54	23	105	.251	.323	.421	.744
23	Rangers	.543	2015	88	74	162	5,511	751	1,419	279	32	172	707	503	76	1,233	101	39	6,187	2,278	483	43	54	32	99	.257	.325	.413	.739
24	Mets	.556	2015	90	72	162	5,527	683	1,351	295	17	177	654	488	68	1,290	51	25	6,144	2,211	489	29	32	42	130	.244	.312	.400	.712
25	Dodgers	.568	2015	92	70	162	5,385	667	1,346	263	26	187	638	563	60	1,258	59	34	6,087	2,222	476	49	30	31	135	.250	.326	.413	.739