For those who haven’t followed the Nationals outside of their trade deadline sell-off, Corbin has had an extremely rough 2021, with 14 losses and a league-worst (among qualified pitchers) 5.98 ERA in 155.0 innings. If you go by Baseball-Reference’s Wins Above Replacement, Corbin has cost his team 1.5 Wins this season, the fourth-worst mark for a pitcher behind only Jake Arrieta, J.A. Happ, and Matt Shoemaker. Of course, Arrieta, Happ, and Shoemaker are only making a combined $16 million this year; Corbin, meanwhile, is signed through 2024 and will make roughly $108 million from 2021 through then.
Of course, position players Eugenio Suarez (-2.7 WAR) and Hunter Dozier (-2.9) have been even worse, and both are signed to longer term deals, albeit still for less than Corbin (and Cody Bellinger and Jarred Kelenic have also been slightly worse, although neither made it beyond arbitration). And another complicating factor is that it’s debatable if Corbin is even that bad, as Fangraphs’ version of WAR places Corbin at a much better 0.0 WAR, thanks in part to a much better FIP (5.47) and xFIP (4.34) rates. And none of this is getting into whether Corbin can rebound, as it wasn’t that long ago that he was making All-Star Teams and picking up Cy Young votes.
Of course, I think the single biggest argument against Corbin being the worst contract is his key role in winning the 2019 World Series. He finished eleventh in Cy Young voting that year, finishing with 202 innings of 135 ERA+ (or a 77 FIP-*, if you prefer) before becoming a key cog on the eventual champs as they leaned heavily on their rotation to avoid exposing a weakened bullpen. Even if he never returns to that form, Corbin played a key role in bringing home a flag that will fly forever (and for a franchise and a city that were both in long World Series droughts, at that).
*A reminder, since I don’t always use it; FIP- works like ERA+, but inverted; so a 77 mark would mean a FIP 23% better than league average, since 77 is 23 points lower than the 100-average.
I’m not sure if there’s a set quantity of “value” that a World Series championship brings in evaluating how good a contract is, but my gut says that if a player played a crucial role in bringing home a title, at the very least, any “WAR shortfall” over the course of their contract should be forgiven. For a long time, my test case for this idea was Barry Zito and his seven-year, $126 million deal* with the Giants, which ran from 2007 to 2013.