OPS+ leaders for decades 1950s ... 2010s.

Minimum 3,500 plate appearances (PA). Derived from data in stathead.com via baseball-reference.com. Glossary below.

Rk	Player	OPS+	BA	OBP	SLG	PA	AB	HR	AB/HR	From	To	Age	Decade
1	Ted Williams	185	.336	.476	.622	4,054	3,175	227	13.99	1950	1959	31-40	1950s
1	Mickey Mantle	171	.282	.415	.542	4,500	3,624	256	14.16	1960	1968	28-36	1960s
1	Willie Stargell	156	.287	.374	.555	5,083	4,399	296	14.86	1970	1979	30-39	1970s
1	Mike Schmidt	153	.277	.385	.540	5,556	4,639	313	14.82	1980	1989	30-39	1980s
1	Barry Bonds	179	.302	.434	.602	6,146	4,894	361	13.56	1990	1999	25-34	1990s
1	Barry Bonds	221	.322	.517	.724	4,072	2,871	317	9.06	2000	2007	35-42	2000s
1	Mike Trout	176	.305	.419	.581	5,273	4,340	285	15.23	2011	2019	19-27	2010s

Williams is a surprise because of his age and that he had enough PA to qualify. Mantle is a surprise because he finished with four down seasons; second in the 1950s. Stargell and Schmidt seem to fit. Bonds ... Trout, of course, fits.

More posts will follow with all with OPS+ at least 125 in a decade. High ranks in two decades:

Mantle: 2,1
Mays: 4,5
Aaron: 6,4
Dick Allen: 3,2
Schmidt: 7,1
Bonds: 1,1

BOLD: highest

Red: lowest; For AB/HR lowest is fewest AB to homer.

OPS+ On Base average Plus Slugging average adjusted for years and ballparks
100*[OBP/lg OBP + SLG/lg SLG - 1]
Adjusted to the player’s ballpark(s)

BA -- Batting Average: Hits/At Bats
For recent years, leaders need 3.1 PA
per team game played

OBP -- On Base "Percentage" (really average) (H + BB + HBP)/(At Bats + BB + HBP + SF) For recent years, leaders need 3.1 PA per team game played

SLG -- Slugging average: Total Bases/At Bats or
(1B + 2*2B + 3*3B + 4*HR)/AB
For recent years, leaders need 3.1 PA
per team game played

PA -- Plate Appearances
When available, we use actual plate appearances from play-by-play game accounts
Otherwise estimated using AB + BB + HBP + SF + SH,
which excludes catcher interferences.

AB -- At Bats; excludes Bases on Balls (walks)

HR -- Home Runs