Who Has the Seventh? Five Internal Set-Up Options for Red Sox's Bullpen

The back end of the Boston Red Sox's bullpen is a strength anchored by right-hander Garrett Whitlock and left-hander Aroldis Chapman.

Bridging the game to them with a lead, on the other hand, remains a question mark in mid-January. The Red Sox have a smattering of quality middle relievers, but not a whole lot of certainty in durability and performance. Last season, that role primarily fell to Justin Wilson and Greg Weissert. However, neither was particularly dominant -- Wilson had a 3.66 ERA in the seventh inning, Weissert a 5.94.

Of the 90 relievers to get at least 45 outs in the seventh inning, those ERAs ranked tied for 49th and 80th, respectively. And while both pitchers had good 2025 seasons overall, it wasn't good enough often enough.

So, how can the Red Sox address that area of the roster in 2026? Here are several internal options.

1. RHP Justin Slaten

Slaten dealt with injuries and some inconsistencies on the mound in 2025. But just last winter, there was real dialogue among the Red Sox contingent that the right-hander had closer potential. Obviously, Chapman nips the opportunity to close in the bud, but the third-year reliever has the chance to be a weapon in the middle-to-late innings.

With a fastball that rides into the high-90s, along with high whiff and chase rates, the framework is there for him to become one of the elite set-up guys in the game.

In 2025, Slaten avoided hard contact and was tremendous at getting to two strikes. The last step for him, beyond simply staying healthy, is putting hitters away. Last year, he struck out just 25 in 34 innings. His 6.62 K/9 ranked 220th out of 244 relievers with at least 30 innings.

But talent-wise, Slaten is right up there with others set-up men around the league. It's just about realizing that potential at this point; he should be the leading candidate for the seventh inning.

2. RHP Kutter Crawford

Perhaps it's unfair to the right-hander to lump him here, but after a strong first half in 2024, he fell off a cliff before missing all of 2025. 

A lot's changed since he last pitched in an MLB game. The Red Sox have added Garrett Crochet, Sonny Gray, Johan Oviedo, and Patrick Sandoval. That's without mentioning the young guys who have and have not debuted.

Crawford could very well win a starting rotation spot in camp, but perhaps his calling is high-leverage relief. Even as good as he was in the first half of 2024, there were signs he wasn't as dominant as he results suggested. His secondaries improved, but his fastball deteriorated from 2023 production.

As a reliever, Crawford is a career 3.35 ERA arm with a strikeout rate over 25 percent. While not elite, it's a dramatic improvement on his career 4.69 ERA as a starter. With the collection of arms vying for the rotation, he's probably the likeliest to move to the bullpen. With a starter's arsenal and perhaps an uptick in fastball velocity, Crawford has a chance to really thrive in that role.

3. LHP Patrick Sandoval

Similar to Crawford, a lot's changed since the Red Sox signed Sandoval. There's been a lot of discourse about him as a trade chip, but I don't buy that the Red Sox won't give him a shot to earn his keep in Boston.

Once a promising starter for the Angels, it's always felt there's more than meets the eye with the southpaw. However, it's been three seasons since he flashed a 2.91 ERA for them in 27 starts. 

He wouldn't be a typical mid-leverage reliever, as his changeup is his money pitch. But we've seen guys like Tommy Kahnle thrive in high leverage without an imposing fastball. Now, is he better served as a long reliever -- similar to Sean Newcomb in 2025 -- with Jovani Morán getting the first crack as a high-leverage lefty? Maybe. But there's a reason so many relievers thrive after toying with starting for a while.

4. LHP Payton Tolle

On one hand, letting Tolle develop his secondaries in Triple-A makes sense for the long-term outlook of him and the team. On the other hand, there are few fastballs more lethal than the rookie's.

There's precedent for the Red Sox having top pitching prospects break into the league as relievers. They did it with Tanner Houck in 2021 and Crawford between 2022 and 2023. So, there's also proof of concept; this doesn't stunt growth into the rotation. Houck was an All-Star in 2024, with Crawford also a top-20 starter in the first half that season.

Tolle has the stuff to dominate out of a big-league bullpen right now. For a team posturing as a contender in 2026, that option may be more enticing than signing a veteran like Danny Coulombe or bringing back Wilson. 

The rookie out of TCU made five relief appearances, including the postseason, with an ERA of 2.84. He was sitting in the high-90s on his heater, even hitting triple digits with frequency. That kind of asset is tough to pass on, but they've got to do what they think is best for his development as well.

5. RHP Greg Weissert

Weissert struggled in the seventh inning last year, but he's one of the more deceptive arms in the Red Sox's bullpen.

Overall, the right-hander had a 2.82 ERA in 67 innings. Whenever he was needed, he was available. Perhaps at times too available, especially with inherited runners, but he's built a track record of availability. It'd do him some good to figure out how to generate more strikeouts, but he's about as dependable as they come when given a clean frame.

He's the most practiced in that role; perhaps he ends up getting first dibs for set-up duty in 2026.