Since 1976, the Houston Astros have the best record by a team on June 20, with a record of 31-16.

	TEAM	REC	W%	G	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Astros	31-16	.660	47	31	16	1,590	236	429	74	11	58	221	157	19	329	27	10	1,796	699	143	20	10	16	34	.270	.341	.440	.780
2	Athletics	27-17	.614	44	27	17	1,491	222	396	71	8	59	210	164	13	287	36	10	1,691	660	138	9	14	10	33	.266	.341	.443	.783
3	Mariners	26-19	.578	45	26	19	1,559	236	426	93	7	55	223	151	14	308	32	8	1,746	698	155	11	11	11	44	.273	.341	.448	.788
4	Orioles	25-19	.568	44	25	19	1,541	223	417	73	4	50	216	139	22	295	19	6	1,724	648	127	12	10	7	35	.271	.338	.421	.758
5	Braves	24-19	.558	43	24	19	1,454	198	382	66	5	51	190	120	11	270	22	11	1,610	611	122	15	10	18	32	.263	.322	.420	.742
6	Angels	25-20	.556	45	25	20	1,582	225	438	81	8	52	214	142	20	293	39	12	1,768	691	141	9	15	11	42	.277	.341	.437	.778
7	Padres	25-20	.556	45	25	20	1,491	175	382	70	15	32	160	146	12	298	38	15	1,672	578	117	15	8	14	29	.256	.326	.388	.714
8	Rangers	25-21	.543	46	25	21	1,578	204	391	78	3	54	191	140	10	309	41	16	1,760	637	135	18	14	12	26	.248	.311	.404	.714
9	Marlins	15-13	.536	28	15	13	947	108	234	43	6	34	104	69	15	232	15	8	1,051	391	83	12	8	7	22	.247	.306	.413	.719
10	Blue Jays	24-21	.533	45	24	21	1,589	201	425	79	5	54	195	142	13	287	18	8	1,769	676	138	15	10	10	34	.267	.331	.425	.756
11	Giants	24-21	.533	45	24	21	1,529	219	402	69	10	46	204	162	5	299	29	14	1,740	629	125	28	16	17	31	.263	.332	.411	.744
12	Dodgers	24-21	.533	45	24	21	1,510	179	400	75	6	50	170	128	10	249	30	14	1,673	637	131	18	7	13	22	.265	.325	.422	.747
13	Cardinals	26-23	.531	49	26	23	1,704	226	476	93	10	48	216	157	21	341	47	10	1,913	733	151	17	14	13	40	.279	.345	.430	.775
14	Nationals	24-22	.522	46	24	22	1,564	187	385	75	12	39	177	115	8	326	32	11	1,715	601	126	18	10	14	37	.246	.299	.384	.684
15	Red Sox	23-22	.511	45	23	22	1,591	240	436	94	11	49	227	154	19	300	20	3	1,784	699	154	9	11	9	36	.274	.343	.439	.782
16	Yankees	23-23	.500	46	23	23	1,596	241	429	79	9	63	231	163	10	310	24	13	1,797	715	151	8	20	11	42	.269	.337	.448	.784
17	Tigers	22-23	.489	45	22	23	1,566	220	393	74	9	69	208	133	10	288	15	16	1,727	692	152	6	12	14	35	.251	.311	.442	.753
18	Pirates	21-23	.477	44	21	23	1,496	169	366	61	7	36	155	133	17	293	30	13	1,682	549	104	24	12	17	33	.245	.311	.367	.678
19	Brewers	21-23	.477	44	21	23	1,499	210	393	89	7	44	193	148	12	305	30	8	1,688	628	140	21	8	9	31	.262	.332	.419	.751
20	White Sox	22-25	.468	47	22	25	1,632	239	459	75	5	55	220	162	18	275	34	18	1,835	709	135	13	10	6	43	.281	.351	.434	.785
21	Guardians	21-24	.467	45	21	24	1,583	221	434	89	8	45	214	164	11	280	38	11	1,783	674	142	17	8	18	36	.274	.345	.426	.771
22	Cubs	21-25	.457	46	21	25	1,586	190	409	65	13	56	182	140	18	334	25	13	1,774	668	134	18	12	15	41	.258	.323	.421	.744
23	Rays	12-15	.444	27	12	15	916	117	218	46	8	25	112	93	12	218	27	10	1,033	355	79	4	8	3	20	.238	.314	.388	.701
24	Twins	19-24	.442	43	19	24	1,513	189	400	78	7	49	177	132	7	267	27	15	1,675	639	134	11	12	8	35	.264	.324	.422	.746
25	Rockies	13-17	.433	30	13	17	1,007	153	278	41	5	50	149	99	4	225	20	9	1,127	479	96	10	7	8	26	.276	.341	.476	.817