How good is the Red Sox defense?

In 2025, the Boston Red Sox led all of baseball in errors, a statistical category they’ve been near the top of for several years now.

And yet, most defensive metrics don’t think the Sox are that bad, and some think they are elite. By Statcast’s Fielding Run Value as presented by Baseball Savant, the Red Sox had the fifth-best defense in baseball last year. By Statcast’s Fielding Run Value as presented by FanGraphs (which is apparently a slightly different thing, though I couldn’t tell you how) they were the seventh-best. By Statcast’s Outs Above Average as presented by FanGraphs, they were the tenth-best. By Statcast’s Outs Above Average as presented by Savant (again, somehow different!), they were more middling at number 13. And by Defensive Runs Saved from the Fielding Bible, they were twelfth.

Which of these metrics is the right metric? Well, according to the rules of arguing about baseball on the internet, the right metric is the one that helps you prove whatever point you’ve already decided you want to make. If you want to say that the Sox suck defensively, go ahead and use errors. If you want to say they’re great, go ahead and use Fielding Run Value. If you want to provide a nuanced opinion, choose any of the others, but nobody cares for nuance and everyone will ignore you.

The truth is that defensive metrics are far behind the metrics we use to measure pitching and hitting, and they probably always will be. This is just how the field of statistics works: some things are harder to measure than others.

Complicating the issue in the case of the Red Sox is the fact that roster features players of shockingly disparate defensive quality. Ceddanne Rafaela was arguably the best gloveman in all of baseball last year; Kristian Campbell was arguably the worst. Carlos Narvaez graded out as elite by many metrics; Connor Wong graded out as horrendous. When Wilyer Abreu was healthy, the Sox had one of the best defensive right fielders you could ask for; when Rob Refsnyder was out there, they were below average. You get the picture, and if you don’t here’s a pretty shocking little image:

According to Savant’s OAA, the Red Sox outfield (the table on the left side of the slider) was far and away the best defensive outfield in baseball, with the gap between them and the number two team almost twice as big as the gap between number two and number three. But in the infield (on the right of the slider) they were the second-worst collection of defenders, a whopping 47 runs worse than the league leaders.

We still don’t know what the Red Sox infield will look like, but it probably won’t have Kristian Campbell in it anymore. It will have Willson Contreras, who was the sixth-best first baseman in baseball by Savant’s OAA. Marcelo Mayer should absolutely be a plus-defender, though we don’t yet know exactly how good he’ll be, how much he’ll play, or where he’ll play. Much of the same can be said about Isiah Kiner-Falefa. Trevor Story, David Hamilton, and Romy Gonzalez, though, are pretty bad by most metrics.

And then there’s the issue of the revamped pitching staff. The Red Sox outfield (the strongest part of their defense, remember!) had 1074 total fielding chances in 2025, which was actually pretty low overall. And the outfield may get even fewer chances in 2026, thanks to the additions of Sonny Gray and Ranger Suárez, two pitchers who induce grounders at a much higher rate than most starters (just like Garrett Crochet).

So how good will the Red Sox defense be in 2026? Talk about that or whatever else you want, and, as always, be good to one another.