Which Teams Improved the Most at the Trade Deadline?

Another trade deadline has come and gone, and I must say, this one was more exciting than I expected. I didn’t see the Yankees, Astros, or Dodgers making huge splashes, given that all three are in a daunting position both for first place in their divisions and a first-round playoff bye. There were also relatively few short-term rental options available; Juan Soto, Frankie Montas, and Luis Castillo, among others, could always be traded, but with none of them free agents after this season, teams could also pull them back if they didn’t like the offers. Meanwhile, players like Willson Contreras, Ian Happ and Carlos Rodón stayed put, also to my surprise. By and large, though, we had a whirlwind of a 48-hour period leading up to the deadline.
So, who won and who lost? That’s a bit of a loaded question, because the definition of winning and losing varies depending on each franchise’s goals. A contending team improving, a rebuilding team getting worse but acquiring a stable of prospects, or an indolent team only re-signing its 37-year-old closer are all things that can be considered a win in one way or the other. But we’re here to do some hardcore ranking, so let’s look only at who improved themselves the most in 2022.
To keep this all science-y rather than a somewhat arbitrary exercise, I first projected the entire league’s rest of season in ZiPS and then repeated the exercise with all trades since July 19 unwound. Since some teams primarily got overall playoff boosts and some teams saw improvement mainly in terms of World Series gains, I took each team’s rank in both categories and then ranked everyone by the harmonic mean of those two ranks. Read the rest of this entry »