Believe me when I say, you have to check this out. Fellow SBN blog Brew Crew Ball has launched its Minor League Splits Database. There, you will find lefty/right, home/road, and situational splits for every minor leaguer, including Washington's.
Do you want to search by minor league affiliate? Sure, you can do that; here's Harrisburg's roster, for instance. How about searching under all of Washington's minor leaguers, alphabetically? Why not---you can do that, too. (Hey, Frank Diaz: Say cheese!)
In sum, this is an excellent tool, and it seems to be current within a week or so. Enjoy hours of fun, or use it to conduct actual research. Either way, this is a winner.