I've linked those espn pages to an Excel spreadsheet, but I don't know how it would work for SON.

I did a quick analysis on the ESPN data - seems like only about 10 teams showed what I'd consider to be a significant difference in Runs vs LHP and RHP (I used Runs/AB as my metric).

My concern with adding the variable is that there is no way to isolate:
1) The quality of the opponent - perhaps they played against shitty lefties vs great lefties (more confidence that the RHP data balances to league average)?
2) Park splits - perhaps they faced lefties more often on the road or in better/worse hitting parks?

I would think by this time of year that there wouldn't be massive skews but it gives me pause.

I'm hoping to do a larger analysis in the offseason - maybe I can incorporate it then to see how much it adds...

With certain teams, RHP vs LHP really does matter. The Indians first among them...

Using .OPS, here are the differences between the splits. A positive number indicates a difference in favor of LHP:

Arizona Diamondbacks 0.064
Cincinnati Reds 0.058
St. Louis Cardinals 0.046
Minnesota Twins 0.045
Milwaukee Brewers 0.044
Boston Red Sox 0.038
Toronto Blue Jays 0.026
San Francisco Giants 0.024
Washington Nationals 0.023
Chicago White Sox 0.009
Baltimore Orioles 0.009
Pittsburgh Pirates 0.007
Oakland Athletics 0.007
Miami Marlins 0.005
Seattle Mariners 0.005
Los Angeles Angels 0.001
New York Yankees -0.004
Colorado Rockies -0.005
Texas Rangers -0.012
Tampa Bay Rays -0.016
Los Angeles Dodgers -0.033
Atlanta Braves -0.036
Kansas City Royals -0.039
San Diego Padres -0.047
Philadelphia Phillies -0.049
New York Mets -0.055
Detroit Tigers -0.063
Chicago Cubs -0.066
Houston Astros -0.093
Cleveland Indians -0.099


I wonder if there's any significance to all of the crappy teams being unable to hit LHP? Except the Tigers, the bottom of this list are the dregs of MLB...