I have an NL Cy Young ballot this year, and with 10 days left in the regular season, I legitimately don’t know who I’m going to vote for. If I was the kind of voter who looked only at run prevention and credited that entirely to the pitcher on the mound, it might be a fairly easy decision in favor of Zack Greinke, given that he’s at +9.4 RA9-WAR, putting him in pretty historic company in terms of keeping runs off the board. If I went solely by the measures that we have a pretty good idea are primarily influenced by the pitcher and not his defenders behind him, it would be pretty easy to cast a vote for Clayton Kershaw, given that he’s leading the fielding in FIP-based WAR by a pretty good margin.
But as we’ve discussed many times here over the years, both of those extremes are clearly incorrect; giving a pitcher no credit or blame for all the non-HR contact he allows is definitely wrong, but so is assigning the entirety of the results of those balls in play to him and pretending that defense does not play a role in run prevention. In reality, a pitcher should get credit (or blame) for some of the impact of events that FIP does not capture, so FIP-based WAR is definitely an incomplete measure of a pitcher’s performance. How much credit or blame should be assigned isn’t entirely clear, and if you just throw your hands up in the air and split the credit down the middle — blending FIP-based and RA9-based WAR together — you’ll note that Jake Arrieta ends up in the top spot, though the differences between all three pitchers at that point are so small as to be insignificant.
As you probably know if you’re reading FanGraphs, I’m not going to simply cast my vote based on total run prevention, since I believe in attempting to isolate player performance when handing out individual awards, and simply using run prevention metrics and pretending like defense isn’t a thing strikes me as a particularly lazy shortcut. But I’m also not going to just use FIP, and not just because it ignores a bunch of plays that do matter; it also has (albeit to a smaller degree) issues with teammate interaction. As our ability to measure a catcher’s impact on balls and strikes has grown, it has become clear that no pitching event is really “fielding independent”, and a pitcher’s walks, strikeouts, and home run rates are indeed impacted by the performance of the guy he’s throwing the ball to.
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