Using the Day by Day Database over at David Pinto’s Baseball Musings blog, one can do leader boards covering specific in-season time periods, without being bound by the beginning and ends of seasons. So, for example, one can (and I do, after the jump) compare the MLB On-Base Percentage leader for each of the past four full seasons (502 PA minimum) with the OBP leader for each of the the past four year-long periods running from All-Star Break to All-Star Break (same 502 PA minimum):
MLB OBP Leader, Full Season
2011 Miguel Cabrera .448
2010 Joey Votto .424
2009 Joe Mauer .444
2008 Chipper Jones .470
MLB OBP Leader, All-Star Break to Next All-Star Break
mid-2011 to mid-2012 Joey Votto .432
mid-2010 to mid-2011 Jose Bautista .436
mid-2009 to mid-2010 Albert Pujols .421
mid-2008 to mid-2009 Albert Pujols .456
Now let’s do the same for Slugging Percentage:
MLB SLG Leader, Full Season
2011 Jose Bautista .608
2010 Josh Hamilton .633
2009 Albert Pujols .658
2008 Albert Pujols .653
MLB SLG Leader, All-Star Break to Next All-Star Break
mid-2011 to mid-2012 Ryan Braun .619
mid-2010 to mid-2011 Jose Bautista .702
mid-2009 to mid-2010 Miguel Cabrera .603
mid-2008 to mid-2009 Albert Pujols .716
I find it interesting how little overlap there is between these “full season” and “mid-season-to mid-season” lists. You can take a set of multi-year performances and if you divide them up one way, the historic leaderboards take on a certain look, but if you just move the start points and end points a bit, history looks diffferent.