There’s been discussion here and elsewhere about the decline in run scoring across the majors this season and in recent seasons. Yes, across the majors the average runs scored per game is currently at 4.14 so far in 2014, down slightly from 4.17 for the full 2013 season, and from 4.32 for the full 2012 season. OPS (On Base Percentage plus Slugging Percentage) across the majors as a whole is down from .724 in 2012, to .714 last season, to .707 so far this season. But the decline in hitting performance has not been uniform across the batting order, and in this post I want to focus on the particularly dramatic drop in the average performance of clean-up hitters in the majors.
The number that baseball reference calls tOPS+ provides a guide to the relationship between OPS of a particular “split” during a particular season, and overall OPS that season, with a split that exactly matches overall OPS being set at 100. Prior to this year, over the previous century of major league baseball (1914 through 2013), the fourth spot in the batting order has averaged 128 tOPS+ over a full season (for comparison, the third spot in the order has averaged 123.8, the fifth spot has averaged 113.9, the eighth spot has averaged 84). Since the adoption of the DH in the AL in 1973, the average tOPS+ for cleanup hitters over a season has been 123.8 (down from 130.8 over the 1914-1972 period). It’s been a little lower over the past ten full seasons (2004-2013) at 122.3.
The best OPS years for cleanup hitters, relative to overall OPS, have been 1961 and 1936; in both of those seasons fourth-spot batters across the majors compiled a collective 140 tOPS+. The lowest tOPS+ for cleanup hitters over a full season has been 117, which has occurred twice, in 1976 and 1985. But this season, with the 2014 All-Star Break having arrived, and with close to 60% of the regular season complete in terms of games played, the collective tOPS+ for cleanup hitters across the majors this season is an astonishingly low 112, easily the lowest of the last 100 seasons. The drop is dramatic just in the last two years — from a 124 tOPS+ for 2012 to 120 for 2013 and now down to the 112 level thus far in 2014.
Let’s look at some raw numbers to add some additional detail to the relative abstraction of tOPS+. OPS for cleanup hitters across the majors averaged .812 in 2012, fell quite a bit to .789 last season, but this season the bottom has dropped out as clean-up hitter OPS in the majors this year has averaged just .752. The only full seasons over the past 100 that fourth-spot hitters have had a lower raw OPS have been 1968 (.745 clean-up spot OPS), 1976 (.739) and the deadball era years before 1919.
As recently as 2008, fourth-spot batters had the highest OPS of any place in the batting order:
4th spot: .840
3rd spot: .825
5th spot: .783
In 2012, fourth spot and third spot batters were very close in terms of average OPS:
3rd spot: .813
4th spot: .812
5th spot: .758
In 2013, the third spot has opened up more of a lead in OPS:
3rd spot: .798
4th spot: .789
5th spot: .741
Now, thus far in 2014, cleanup hitters have lost, at least for the moment, even their claim to having the second-best hitting position in the batting order:
3rd spot: .803
5th spot: .753
4th spot: .752
What’s going on with cleanup hitters in 2014? Are we seeing a mostly random effect that will soon revert toward the mean? Are we seeing the kinds of hitters who tend to bat fourth suffering disproportionately from current trends in the game — an increase in strikeouts without a commensurate increase in walks or power? Are we seeing a change in strategy by managers in who they tend to bat in the clean-up spot in the order? Is the term “clean-up spot” itself becoming obsolete? I offer no answers at the moment, just questions to ponder here at All-Star break time.
Lets look at some raw