As we finish up our top five Pittsburgh Pirates lists, we end it off at first base. First base was a bit of a tricky position to find five players for as many of them, such as Willie Stargell, George Grantham, or Orlando Merced, were part of other lists, and therefore did not qualify for this list. Had I not included them on other lists, they probably would have ended up here.
Regardless, the Pittsburgh Pirates still have had some impressive first basemen throughout their history. As I do with all of these, I will be heavily weighing era adjusted numbers such as wRC+ and OPS+.