team most run diff, season, since 1900, exactly.500 win%

Since 1900, the Boston Red Sox have the highest run differential by a team with a win percentage of .500 in a season, with a differential of 80 runs in 1985.

	TEAM	DIFF	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	Red Sox	80	.500	1985	81	81	163	5,720	800	1,615	292	31	162	760	562	30	816	66	27	6,419	2,455	485	50	57	39	164	.282	.347	.429	.776
2	Rangers	79	.500	2025	81	81	162	5,443	684	1,275	245	15	175	658	486	63	1,327	134	33	6,043	2,075	435	11	40	19	92	.234	.302	.381	.684
3	Senators	73	.500	1953	76	76	152	5,149	687	1,354	230	53	69	644	595	31	604	65	36	5,857	1,897	352	82			134	.263	.343	.368	.711
4	Reds	66	.500	1902	70	70	141	4,908	632	1,383	188	77	18	531	297	39	467	131		5,342	1,779	283	98				.282	.328	.362	.690
5	Red Sox	63	.500	1944	77	77	156	5,400	739	1,456	277	56	69	691	522	20	502	60	40	6,052	2,052	402	110			115	.270	.336	.380	.716
6	White Sox	58	.500	2002	81	81	162	5,502	856	1,475	289	29	217	819	555	49	952	75	31	6,207	2,473	535	48	53	17	111	.268	.338	.449	.787
7	Tigers	53	.500	1958	77	77	154	5,194	659	1,384	229	41	109	611	463	22	678	48	32	5,805	2,022	379	75	51	37	127	.266	.326	.389	.715
8	Diamondbacks	46	.500	2012	81	81	162	5,462	734	1,416	307	33	165	710	539	41	1,266	93	51	6,148	2,284	505	61	45	47	108	.259	.328	.418	.746
9	Twins	46	.500	1973	81	81	162	5,625	738	1,521	240	44	120	688	598	34	954	87	46	6,331	2,209	404	34	40	49	150	.270	.342	.393	.735
10	Red Sox	45	.500	1934	76	76	153	5,337	820	1,465	287	70	51	756	610	11	535	116	47	6,043	2,045	408	85				.274	.350	.383	.733
11	Indians	44	.500	2008	81	81	162	5,543	805	1,455	339	22	171	772	560	103	1,213	77	29	6,298	2,351	532	43	49	44	123	.262	.339	.424	.763
12	Cardinals	40	.500	1973	81	81	162	5,478	643	1,418	240	35	75	592	531	29	796	100	46	6,177	1,953	350	89	50	82	149	.259	.325	.357	.681
13	Athletics	37	.500	2010	81	81	162	5,448	663	1,396	276	30	109	619	527	47	1,061	156	38	6,116	2,059	415	43	51	16	129	.256	.324	.378	.702
14	Expos	36	.500	1988	81	81	163	5,573	628	1,400	260	48	107	575	454	32	1,053	189	89	6,169	2,077	415	66	44	71	120	.251	.309	.373	.682
15	Phillies	30	.500	1984	81	81	162	5,614	720	1,494	248	51	147	673	555	29	1,084	186	60	6,283	2,285	446	39	46	60	140	.266	.333	.407	.740
16	Astros	30	.500	1977	81	81	162	5,530	680	1,405	263	60	114	638	515	40	839	187	72	6,200	2,130	437	76	39	60	98	.254	.320	.385	.705
17	Brewers	29	.500	2005	81	81	162	5,448	726	1,413	327	19	175	689	531	73	1,162	79	34	6,156	2,303	521	66	38	55	137	.259	.331	.423	.754
18	Brewers	28	.500	1989	81	81	162	5,473	707	1,415	235	32	126	660	455	50	791	165	62	6,083	2,092	393	51	54	41	108	.259	.318	.382	.701
19	Indians	28	.500	1916	77	77	157	5,064	630	1,264	233	66	16	533	522	33	605	160		5,853	1,677	315	234				.250	.324	.331	.655
20	Giants	21	.500	2025	81	81	162	5,375	705	1,261	239	28	173	672	556	66	1,380	68	24	6,071	2,075	440	22	52	14	103	.235	.311	.386	.697
21	Astros	21	.500	1974	81	81	162	5,489	653	1,441	222	41	110	603	471	29	864	108	65	6,120	2,075	373	83	48	49	124	.263	.322	.378	.700
22	Orioles	20	.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
23	Giants	19	.500	2022	81	81	162	5,392	716	1,261	255	18	183	683	571	95	1,462	64	16	6,117	2,101	456	6	53	14	109	.234	.315	.390	.705
24	Athletics	17	.500	1987	81	81	162	5,511	806	1,432	263	33	199	761	593	36	1,056	140	63	6,238	2,358	495	50	48	39	113	.260	.333	.428	.761
25	Padres	17	.500	1982	81	81	162	5,575	675	1,435	217	52	81	611	429	22	877	165	77	6,159	1,999	350	86	47	78	96	.257	.311	.359	.669