The Seattle Mariners had the best on-base percentage by a team last month, with an on-base percentage of .345.

	TEAM	OBP	MONTH	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	Mariners	.345	April 2025	25	.640	16	9	857	138	214	33	1	39	131	112	16	218	32	11	994	366	73	4	5	3	13	.250	.427	.773
2	Yankees	.342	April 2025	28	.536	15	13	957	141	249	53	4	38	136	108	15	275	22	9	1,087	424	95	0	7	4	17	.260	.443	.785
3	Cubs	.341	April 2025	24	.625	15	9	836	141	223	44	8	32	137	91	8	189	38	6	949	379	84	5	9	3	10	.267	.453	.794
4	Red Sox	.341	April 2025	27	.593	16	11	941	148	245	57	3	37	140	107	12	238	27	6	1,068	419	97	0	8	7	14	.260	.445	.786
5	Dodgers	.339	April 2025	25	.600	15	10	844	131	222	40	6	36	127	91	10	200	21	6	954	382	82	1	8	1	17	.263	.453	.792
6	Braves	.334	April 2025	25	.560	14	11	862	119	227	42	2	31	113	86	7	205	18	3	961	366	75	2	4	0	18	.263	.425	.758
7	Brewers	.333	April 2025	27	.593	16	11	902	144	228	37	4	24	128	100	13	202	37	9	1,033	345	65	9	9	5	16	.253	.382	.715
8	Phillies	.330	April 2025	26	.538	14	12	871	113	213	37	4	19	106	105	9	206	29	5	994	315	60	2	7	5	18	.245	.362	.691
9	Mets	.329	April 2025	27	.704	19	8	911	133	232	51	8	29	127	93	13	195	17	3	1,027	386	88	0	10	6	18	.255	.424	.753
10	Cardinals	.326	April 2025	27	.407	11	16	936	123	238	56	1	23	116	94	8	212	22	4	1,045	365	80	2	5	7	25	.254	.390	.716
11	Reds	.325	April 2025	27	.519	14	13	915	130	225	45	2	26	124	99	10	234	32	10	1,031	352	73	2	5	3	15	.246	.385	.709
12	Padres	.322	April 2025	25	.560	14	11	818	94	207	32	3	23	85	79	6	170	16	7	915	314	58	7	5	2	20	.253	.384	.705
13	Twins	.320	April 2025	27	.481	13	14	892	114	218	50	4	23	108	83	19	221	16	5	1,001	345	77	0	7	1	16	.244	.387	.706
14	Diamondbacks	.319	April 2025	26	.538	14	12	868	130	200	47	6	35	125	109	9	199	24	5	1,001	364	88	4	11	3	19	.230	.419	.738
15	Tigers	.318	April 2025	27	.667	18	9	884	124	210	36	3	30	121	97	11	240	12	1	1,003	342	69	4	7	2	11	.238	.387	.705
16	Athletics	.317	April 2025	26	.538	14	12	884	115	229	42	5	33	109	78	0	195	10	5	968	380	80	1	5	0	26	.259	.430	.747
17	Astros	.316	April 2025	26	.538	14	12	871	109	215	36	3	24	103	82	10	211	20	5	975	329	63	4	8	5	18	.247	.378	.694
18	Marlins	.313	April 2025	25	.360	9	16	871	115	222	43	2	23	110	70	6	222	18	9	958	338	68	5	6	1	8	.255	.388	.701
19	Giants	.312	April 2025	27	.593	16	11	891	121	202	44	5	25	113	106	6	239	16	7	1,010	331	74	3	4	2	10	.227	.371	.683
20	Rays	.309	April 2025	26	.423	11	15	873	103	211	41	3	24	99	82	6	221	27	5	968	330	68	0	7	0	24	.242	.378	.687
21	Pirates	.308	April 2025	26	.423	11	15	864	91	204	34	5	20	90	84	9	228	18	6	964	308	59	1	6	3	29	.236	.356	.665
22	Nationals	.308	April 2025	27	.444	12	15	890	115	215	35	6	25	108	81	7	198	23	8	989	337	66	5	6	0	15	.242	.379	.687
23	Blue Jays	.302	April 2025	25	.440	11	14	840	81	194	38	1	15	78	78	11	181	18	5	941	279	54	5	7	4	20	.231	.332	.634
24	Guardians	.298	April 2025	26	.577	15	11	837	96	193	33	1	26	89	75	10	211	22	4	937	306	60	3	12	2	13	.231	.366	.663
25	Rangers	.291	April 2025	26	.500	13	13	847	87	199	40	3	24	85	62	7	220	22	7	924	317	67	2	6	2	16	.235	.374	.665