The Boston Red Sox had the best on-base percentage by a team in 2013, with an on-base percentage of .349.

	TEAM	OBP	SEASON	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS
1	Red Sox	.349	2013	162	.599	97	65	5,651	853	1,566	363	29	178	819	581	72	1,308	123	19	6,378	2,521	570	24	50	51	137	.277	.446	.795
2	Tigers	.346	2013	162	.574	93	69	5,735	796	1,625	292	23	176	767	531	43	1,073	35	20	6,388	2,491	491	32	47	40	146	.283	.434	.780
3	Cardinals	.332	2013	162	.599	97	65	5,557	783	1,494	322	20	125	745	481	64	1,110	45	22	6,202	2,231	467	56	44	38	154	.269	.401	.733
4	Rays	.329	2013	163	.564	92	71	5,538	700	1,421	296	23	165	670	589	36	1,171	73	38	6,242	2,258	484	24	55	31	140	.257	.408	.737
5	Angels	.329	2013	162	.481	78	84	5,588	733	1,476	270	39	164	696	523	48	1,221	82	34	6,260	2,316	473	37	64	40	150	.264	.414	.743
6	Reds	.327	2013	162	.556	90	72	5,499	698	1,370	274	20	155	664	585	76	1,245	67	35	6,291	2,149	449	85	46	65	129	.249	.391	.718
7	Indians	.327	2013	162	.568	92	70	5,465	745	1,391	290	23	171	711	562	51	1,283	117	36	6,165	2,240	484	31	56	19	106	.255	.410	.737
8	Athletics	.327	2013	162	.593	96	66	5,521	767	1,403	301	25	186	725	573	45	1,178	74	28	6,209	2,312	512	21	49	29	108	.254	.419	.745
9	Dodgers	.326	2013	162	.568	92	70	5,491	649	1,447	281	17	138	618	476	57	1,146	78	28	6,143	2,176	436	71	48	45	130	.264	.396	.722
10	Rangers	.323	2013	163	.558	91	72	5,585	730	1,465	262	23	176	691	462	61	1,067	149	46	6,195	2,301	461	45	42	26	124	.262	.412	.735
11	Diamondbacks	.323	2013	162	.500	81	81	5,676	685	1,468	302	31	130	647	519	43	1,142	62	41	6,331	2,222	463	50	43	51	160	.259	.391	.715
12	Rockies	.323	2013	162	.457	74	88	5,599	706	1,511	283	36	159	673	427	26	1,204	112	32	6,152	2,343	478	65	35	26	111	.270	.418	.741
13	Braves	.321	2013	162	.593	96	66	5,441	688	1,354	247	21	181	656	542	55	1,384	64	31	6,131	2,186	449	58	35	36	119	.249	.402	.723
14	Giants	.320	2013	162	.469	76	86	5,552	629	1,446	280	35	107	596	469	39	1,078	67	26	6,168	2,117	422	66	42	40	131	.260	.381	.702
15	Blue Jays	.318	2013	162	.457	74	88	5,537	712	1,398	273	24	185	669	510	38	1,123	112	41	6,152	2,274	482	29	38	19	133	.252	.411	.729
16	Royals	.315	2013	162	.531	86	76	5,549	648	1,443	254	34	112	620	422	42	1,048	153	32	6,092	2,101	400	37	42	38	131	.260	.379	.694
17	Pirates	.313	2013	162	.580	94	68	5,486	634	1,346	273	35	161	603	469	88	1,330	94	42	6,134	2,172	469	62	29	41	120	.245	.396	.709
18	Nationals	.313	2013	162	.531	86	76	5,436	656	1,365	259	27	161	621	464	40	1,192	88	28	6,047	2,161	447	68	39	35	115	.251	.398	.710
19	Orioles	.313	2013	162	.525	85	77	5,620	745	1,460	298	14	212	719	416	36	1,125	79	29	6,144	2,422	524	27	45	36	105	.260	.431	.744
20	Twins	.312	2013	162	.407	66	96	5,564	614	1,346	285	15	151	590	533	52	1,430	52	33	6,210	2,114	451	29	32	20	103	.242	.380	.692
21	Brewers	.311	2013	162	.457	74	88	5,474	640	1,381	238	43	157	610	407	71	1,183	142	50	6,064	2,176	438	77	35	22	116	.252	.398	.708
22	Padres	.308	2013	162	.469	76	86	5,517	618	1,349	246	26	146	578	467	52	1,309	118	34	6,122	2,085	418	52	34	36	99	.245	.378	.686
23	Yankees	.307	2013	162	.525	85	77	5,449	650	1,321	247	24	144	614	466	57	1,214	115	31	6,044	2,048	415	36	36	33	121	.242	.376	.683
24	Phillies	.306	2013	162	.451	73	89	5,456	610	1,355	255	32	140	578	417	53	1,205	73	29	6,014	2,094	427	57	31	41	131	.248	.384	.690
25	Mets	.306	2013	162	.457	74	88	5,559	619	1,318	263	32	130	593	512	51	1,384	114	35	6,207	2,035	425	53	32	40	106	.237	.366	.672