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Craig Breslow spoke on the NESN broadcast during Sunday’s game and discussed his vision for a winning Red Sox team. In Breslow’s eyes, an athletic and sturdy defensive team is the key to achieving success. He also seemed to hint at his overarching philosophy in fielding a contender, which seems to break from past Red Sox teams focused on a deep lineup with all-or-nothing power. This is also not a massive surprise considering Breslow just traded Rafael Devers, who neither fields or runs well—not exactly the archetype that Breslow wants as a franchise cornerstone.
With all that being said, the Red Sox are currently tied for the league-lead in errors committed, a stat that can be relatively useless when considering the human element, and the wide array of defensive statistics available beyond errors. For example, the Red Sox currently rank 10th in Defensive Runs Saved (DRS) with 20, and 18th in Outs Above Average (OAA) with -4.
Ceddanne Rafaela is easily the best defensive player on the team, and will be the center fielder in Boston for the foreseeable future. Rafaela has one of the best reaction times in baseball, while carrying 88th percentile sprint-speed and a strong throwing arm. Rafaela has gotten even better defensively this season, and his 13 OAA is tied for first in MLB.
(Statcast)
Elsewhere in the outfield, Wilyer Abreu leads the team in five-star plays. Statcast qualifies any fly ball with a sub-25% catch probability as a five-star play, and Abreu has three of them, which ranks third in the league. Abreu is 27th league-wide in OAA, and he will have a decent chance at another Gold Glove in right field this season. Jarren Duran, on the other hand, has not replicated his solid defense from a season ago. In Duran’s defense, he has had to transition from center to left field, which is made even tougher at Fenway with the green monster. Duran currently has -5 OAA, which is worst among all Red Sox outfielders.
The good news is that, in a small sample, Roman Anthony has demonstrated plus skills in the outfield, and should be above the 70th percentile in terms of OAA throughout his career. His defensive metrics grade out really well in right field, but Anthony will likely see more time at left in the coming years, especially if the Red Sox elect to trade Duran and hold onto Abreu.
Unfortunately, the infield has not been the same story defensively. Alex Bregman, David Hamilton, and Marcelo Mayer all have one OAA this season, and they lead all Red Sox infielders. Both Romy Gonzalez and Abraham Toro have been slightly below average at first, but neither has performed as poorly defensively as Triston Casas. That is another factor to consider with Casas’s long-term future with the team, although Breslow may be okay with one or two poor defenders on the roster if their offensive output offsets their defensive mishaps.
Trevor Story is another infielder who is just average defensively. Realistically, Marcelo Mayer will move to shortstop at some point during Story’s remaining tenure with the Red Sox. Mayer has better range, and likely a bit more arm strength, and his athleticism hasn't been sapped by years of injuries. A better shortstop will make the infield group better as a whole.
Finally, we reach Kristian Campbell, a player who has really struggled defensively this season. Although Campbell has been suitable in the outfield, he had an awful run defensively at second base earlier this season. The defense could have played a real factor in Campbell being sent down, although clearly he was struggling with the bat as well. What makes the situation especially difficult for Boston is that the outfield spots are not only full now, but in the future as well. Campbell will probably get another shot at second base, but his -5 OAA will need to improve or he will risk being a utility player who can't stick at any position.
Overall, the Red Sox are clearly trying to build an athletic defense that can stack up against the best teams in MLB. Yes the errors this season have been untimely and incredibly frustrating, but the Red Sox have some great young fielders, and the defense should only improve from here. It isn't the sexiest way to build a contending team, but a good defense can cover for a lot of holes elsewhere on the roster.







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