The Best Team Defenses Thus Far

The Guardians rate as one of baseball’s bigger surprises. After finishing 76-86 last year — their worst record since 2012 — they’ve rebounded to go 57-33 thus far, and entered Wednesday with the AL’s best record. Their offense is much more potent than it was last year, and despite losing ace Shane Bieber for the season due to Tommy John surgery, they rank second in the league in run prevention at 3.87 runs per game.
While Cleveland’s staff owns the AL’s second-highest strikeout rate (24.2%), a good amount of credit for the team’s run prevention belongs to its defense. By my evaluation of a handful of the major defensive metrics — Defensive Runs Saved, Ultimate Zone Rating, Statcast’s Fielding Run Value (FRV), and our catcher framing metric (hereafter abbreviated as FRM, as it is on our stat pages) — the Guardians rate as the majors’ second-best defensive team thus far this season. The Yankees, who spent much of the first half atop the AL East before a 5-16 slide knocked them into second place, are the only team ahead of them.
On an individual level, even a full season of data isn’t enough to get the clearest picture of a player’s defense, and it’s not at all surprising that a 600-inning sample produces divergent values across the major metrics. After all, they’re based on differing methodologies that produce varying spreads in runs from top to bottom, spreads that owe something to what they don’t measure, as well as how much regression is built into their systems. Pitchers don’t have UZRs or FRVs, catchers don’t have UZRs, and DRS tends to produce the most extreme ratings. Still, within this aggregation I do think we get enough signal at this point in the season to make it worth checking in; I don’t proclaim this to be a bulletproof methodology so much as a good point of entry into a broad topic. Read the rest of this entry »




