Between the 1919 and 1929 seasons, the New York Yankees had the best winning percentage by a team, winning 60.5 percent of the time.

	TEAM	W%	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Yankees	.605	1,013	661	1,681	57,647	9,069	16,660	2,777	851	1,256	8,318	5,848	313	5,858	796	65,776	24,907	4,884	1,968	.289	.358	.432	.790
2	Giants	.585	977	692	1,676	58,315	8,610	16,891	2,652	767	971	7,821	4,768	345	4,805	1,122	64,986	23,990	4,390	1,558	.290	.347	.411	.758
3	Pirates	.567	948	724	1,682	58,292	8,308	16,949	2,556	1,124	503	7,484	4,563	314	3,996	1,464	65,035	23,262	4,183	1,866	.291	.346	.399	.745
4	Reds	.534	894	779	1,681	56,917	7,372	16,060	2,396	991	358	6,609	4,449	350	3,794	1,185	63,855	21,512	3,745	2,139	.282	.338	.378	.716
5	Cubs	.527	882	793	1,683	57,363	7,817	16,122	2,693	655	747	7,087	4,938	360	5,100	1,180	64,704	22,366	4,095	2,043	.281	.342	.390	.732
6	Cardinals	.524	876	795	1,679	58,330	8,333	16,824	2,902	882	866	7,602	4,792	312	4,979	1,033	65,262	24,088	4,650	1,828	.288	.346	.413	.759
7	Indians	.520	870	804	1,677	57,556	8,407	16,898	3,365	765	434	7,599	5,533	426	4,021	863	65,801	23,095	4,564	2,286	.294	.360	.401	.761
8	Senators	.509	848	819	1,683	57,418	7,944	16,233	2,644	912	411	7,075	5,426	475	4,738	1,312	65,452	21,934	3,967	2,133	.283	.350	.382	.732
9	Tigers	.501	840	838	1,693	58,202	8,878	17,122	2,995	957	550	7,952	6,044	339	4,503	1,089	66,905	23,681	4,502	2,320	.294	.364	.407	.771
10	Robins	.499	834	839	1,682	58,041	7,435	16,110	2,459	816	610	6,727	4,494	280	4,558	837	64,543	22,031	3,885	1,728	.278	.332	.380	.712
11	Browns	.496	829	841	1,681	57,722	8,297	16,619	2,889	825	741	7,412	5,110	368	4,485	958	65,352	23,381	4,455	2,152	.288	.350	.405	.755
12	White Sox	.489	819	856	1,682	57,114	7,801	16,093	2,848	759	392	6,997	5,559	393	4,615	1,386	65,427	21,635	3,999	2,361	.282	.350	.379	.728
13	Athletics	.484	806	858	1,673	57,212	7,799	15,952	2,809	734	792	7,046	4,993	390	5,385	777	64,576	22,605	4,335	1,981	.279	.341	.395	.736
14	Red Sox	.396	661	1,009	1,680	56,598	6,792	15,028	2,772	688	348	6,125	5,013	399	4,882	869	63,997	20,220	3,808	1,987	.266	.330	.357	.687
15	Braves	.395	660	1,010	1,677	57,592	6,732	15,714	2,266	742	376	5,982	4,319	323	4,645	908	64,129	20,592	3,384	1,895	.273	.327	.358	.685
16	Phillies	.368	613	1,052	1,672	58,296	7,588	16,265	2,768	556	986	6,896	4,534	332	5,717	730	64,694	23,103	4,310	1,532	.279	.335	.396	.731