Slaten struck out one over a scoreless inning in Sunday's 4-1 loss to the Rays.
Slaten made his first appearance since being activated off the injured list Saturday. The right-hander had dealt with an oblique injury that kept him sidelined since April 4. Slaten is likely to fill a spot at the back end of Boston's bullpen.
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Red Sox's Justin Slaten: Back from injured list
Rotowire
The Red Sox reinstated Slaten (oblique) from the injured list Saturday, Ari Alexander of 7 News Boston reports.
After pitching two shutout innings during his rehab assignment with Triple-A Worcester, Slaten will return to Boston's bullpen, ending a month-long absence due to an oblique strain. Jack Anderson was optioned to Worcester in a corresponding move.
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Red Sox's Justin Slaten: Poised for return
Rotowire
Slaten (oblique) is expected to be activated from the 15-day injured list Saturday or Sunday, MLB.com reports.
Slaten made two strong rehab appearances for Triple-A Worcester and was seemingly available to be activated Friday after Boston optioned Jake Bennett following his start Thursday. Instead, the team recalled Jack Anderson for Friday's game against the Rays. "I think you'll see Slaten this weekend at some point active," interim manager Chad Tracy told Christopher Smith of MassLive.com before Friday's game. The manager believed that Anderson could provide length if needed. Slaten, who hasn't pitched since April 8, recently threw for the WooSox on Wednesday.
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Red Sox's Justin Slaten: Begins rehab stint
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Slaten (oblique) allowed one hit and struck out two over a scoreless inning for Double-A Portland on Sunday.
Slaten opened the rehab assignment by serving as a game opener for the Sea Dogs. The right-hander's next outing will be Tuesday or Wednesday at Triple-A Worcester, per Chris Cotillo of MassLive.com. It's uncertain if Slaten will require more rehab outings beyond what's coming up in the next two days. He last pitched for Boston on April 4.
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Red Sox's Justin Slaten: Poised for rehab stint
Rotowire
Slaten (oblique) will begin a rehab assignment with Double-A Portland on Sunday, Tim Healey of The Boston Globe reports.
Slaten has been sidelined since early April with a right oblique strain but has been cleared to test things out in a game setting. The righty reliever will likely need multiple rehab appearances before rejoining the Boston bullpen.
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Red Sox's Justin Slaten: Throwing bullpen sessions
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Slaten (oblique) threw a bullpen session Monday, Christopher Smith of MassLive.com reports.
Monday marked the first time that Slaten has done any kind of mound work since he landed on the injured list in early April with a right oblique strain. Interim manager Chad Tracy said the right-hander is due to throw another bullpen within the next several days, after which the team will evaluate his progress and potentially determine when he may come back from the IL.
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Red Sox's Justin Slaten: Shelved with oblique strain
Rotowire
The Red Sox placed Slaten on the 15-day injured list Wednesday due to a right oblique strain.
Boston had previously noted that Slaten wasn't available out of the bullpen for Tuesday's 3-2 win over Milwaukee due to a sore oblique, but the righty reliever will now be shut down for at least two weeks after being diagnosed with a strain. The Red Sox recalled lefty Tyler Samaniego from Triple-A Worcester to take Slaten's spot in the bullpen. For his part, Slaten believes his injury is minor and is hopeful to return from the IL when first eligible April 20, per Jen McCaffrey of The Athletic.
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Red Sox's Justin Slaten: Dealing with sore oblique
Rotowire
Slaten was unavailable for Tuesday's game against the Brewers due to oblique soreness, Chris Cotillo of MassLive.com reports.
The team has labeled Slaten as day-to-day, so his injury doesn't seem to be too severe. The 28-year-old is off to a strong start this season after striking out five batters over 3.1 shutout innings, picking up holds in two of his four appearances.
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Red Sox's Justin Slaten: Works clean eighth inning
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Slaten struck out one over a perfect inning to earn a hold in Friday's 5-2 win over San Diego.
Slaten pitched a 1-2-3 eighth inning to earn his second hold in three appearances this season, both of which set up saves for closer Aroldis Chapman. Coming off a 2025 season affected by a shoulder injury, a healthy Slaten will be a vital piece of the bullpen's setup crew in 2026.
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Red Sox's Justin Slaten: Shaky first outing off IL
Rotowire
Slaten allowed two hits and one walk while striking out one over a scoreless inning in Friday's 4-2 loss to the Pirates.
This was Slaten's first appearance since he was activated off the injured list Thursday, and understandably, it was shaky. He allowed a leadoff single to Oneil Cruz, who was then erased on a double play, but Slaten then issued a two-out walk and allowed a single before wriggling out of the threat. Slaten's previous appearance in the majors was May 28.
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Red Sox's Justin Slaten: Activation imminent
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Red Sox manager Alex Cora said Monday that Slaten (shoulder) probably won't require another rehab appearance before being activated from the 60-day injured list, Tim Healey of The Boston Globe reports.
Slaten has made three rehab appearances with Triple-A Worcester, yielding just one unearned run with a 5:1 K:BB over three innings. The reliever has been shelved since late May due to right shoulder inflammation.
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Red Sox's Justin Slaten: Sent out on rehab assignment
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Slaten (shoulder) will begin a rehab assignment with Triple-A Worcester on Tuesday, Ian Browne of MLB.com reports.
Slaten had been scheduled to throw a live batting practice session Monday. However, he's feeling good enough that the Red Sox have opted to have him skip that session in order to send him out on a rehab assignment right away. Slaten has been shelved since early June with right shoulder inflammation, so he'll likely need multiple appearances in the minors before making his return to the Boston bullpen.
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Red Sox's Justin Slaten: Throws off mound
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Slaten (shoulder) threw off a mound at Fenway Park on Tuesday, Rob Bradford of WEEI.com reports.
Slaten looked to be throwing at full effort in his first time tossing from the bump since he landed on the injured list in early June due to right shoulder inflammation. The right-hander will surely require some rehab appearances before being activated from the 60-day injured list, and it's not clear when he might be ready for game action in the minors.
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Red Sox's Justin Slaten: Restarts throwing program
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Manager Alex Cora said Saturday that Slaten (shoulder) has resumed playing catch, Christopher Smith of MassLive.com reports.
The Red Sox pulled Slaten off his throwing program last week in an effort to focus on building strength in his shoulder. Now that the team is satisfied with his strength, the right-handed reliever will begin building back up. He remains without an official return timeline, but he figures to still be multiple weeks away from activation.
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Red Sox's Justin Slaten: No longer throwing
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Red Sox manager Alex Cora said Thursday that Slaten (shoulder) is no longer throwing and is instead doing plyometric exercises, Christopher Smith of MassLive.com reports.
Out since late May with right shoulder inflammation, Slaten played catch back on June 27, but he's backed off a throwing program since then and is focusing on rebuilding shoulder strength. Once he's throwing again, Slaten will need time to build back up, so he looks to be several weeks away from a potential return.
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Red Sox's Justin Slaten: Starting up throwing program
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Slaten (shoulder) is scheduled to play catch Saturday, Mac Cerullo of the Boston Herald reports.
It will be the right-hander's first time throwing since he landed on the injured list nearly a month ago due to shoulder inflammation. Slaten will require some time to build back up in his throwing program, so he shouldn't be expected to rejoin the Red Sox until after the All-Star break.
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Red Sox's Justin Slaten: Still not throwing
Rotowire
Slaten (shoulder) has yet to play catch since being placed on the injured list Sunday, Christopher Smith of MassLive.com reports.
Slaten was diagnosed with shoulder fatigue when he was placed on the injured list, so the issue didn't appear to be overly serious. However, he's likely to be sidelined until at least late June given his lack of progress.
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Red Sox's Justin Slaten: Notches third save
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Slaten picked up the save in Monday's 4-2 win against the White Sox, pitching a clean inning with one strikeout.
Slaten efficiently secured the win, requiring only 12 pitches -- 10 of which were strikes -- to retire the side in order. Aroldis Chapman pitched the eighth inning, as he was called upon to face the top of the Chicago lineup. However, this outing shows that Slaten could be in line for more save opportunities as Boston manager Alex Cora may look to deploy Chapman in the highest leverage spots. Although Slaten owns a 4.00 ERA, his performance has been much better under the hood, pitching to a 1.59 FIP, 0.56 WHIP and 8:1 K:BB across nine innings.
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Red Sox's Justin Slaten: Slams door for second save
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Slaten earned the save after throwing a clean ninth inning in Wednesday's win over the Rays. He struck out two.
Slaten faced little resistance, retiring the side on just 11 pitches (eight strikes) for his second save of the season. Aroldis Chapman remains the favorite for save opportunities out of the Boston bullpen, although the left-hander can cede the occasional chance based on certain matchups. The right-handed Slaten, who now holds a 5.14 ERA, 0.71 WHIP and 5:1 K:BB through seven innings, was called upon to face three right-handed batters Wednesday.
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Red Sox's Justin Slaten: Notches save in opener
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Slaten struck out one and didn't allow a baserunner in a scoreless ninth inning to earn the save Thursday against the Rangers.
Closer Aroldis Chapman entered for the eighth inning with the game tied 2-2, as the lefty-hitting Corey Seager was batting leadoff, opening up the ninth inning for Slaten after Boston took the lead. The right-hander recorded two saves and 13 holds with a 2.93 ERA, 1.01 WHIP and 58:9 K:BB across 55.1 innings as a rookie last season, and he's one of the Red Sox's top relief arms again in 2025, even if Chapman is expected to be the primary closer early on.
