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Aroldis Chapman RP | BOS
Red Sox's Aroldis Chapman: Picks up ninth save
Chapman earned the save in Sunday's 3-1 win over Atlanta, logging a strikeout and a walk in a scoreless ninth inning.
Chapman has allowed just one run while striking out 10 in his last eight innings, and he improved to 9-for-10 in save chances this season. Overall, the 37-year-old southpaw sports a 1.88 ERA with a 1.00 WHIP and 32:9 K:BB across 24 innings this year.
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Codi Heuer RP | BAL
Rangers' Codi Heuer: Contract selected by Texas
The Rangers selected Heuer's contract from Triple-A Round Rock on Sunday, Shawn McFarland of The Dallas Morning News reports.
Heuer will receive his first look in the big leagues since 2021 after posting a 3.27 ERA, 1.32 WHIP and 25:11 K:BB across 22 innings with Round Rock. The right-hander will provide the Rangers with some bullpen depth while Nathan Eovaldi (triceps) heads to the injured list.
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Erik Swanson RP | TOR
Blue Jays' Erik Swanson: Back from injured list
The Blue Jays reinstated Swanson (forearm) from the 60-day injured list Sunday.
The right-hander has been sidelined for the first couple months of the season due to carpal tunnel syndrome in his right forearm, but he's ready to rejoin the Blue Jays after a six-outing rehab assignment with Triple-A Buffalo. Swanson had a 5.03 ERA across 45 appearances last season, but he recorded four saves and 29 holds with a 2.97 ERA during the regular season in 2023 and could return to a high-leverage role if he can regain that form.
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Justin Slaten RP | BOS
Red Sox's Justin Slaten: Out with shoulder issue
The Red Sox placed Slaten on the 15-day injured list Sunday due to right shoulder inflammation.
According to Chris Cotillo of MassLive.com, Slaten experienced some fatigue after his most recent appearance in Milwaukee on Wednesday, when he took the loss and a blown save after giving up two unearned runs in one-third of an inning. The right-hander will be eligible to be reinstated June 13, and he could be ready to rejoin the Red Sox at that point since his injury doesn't appear to be overly serious.
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Luis Guerrero RP | BOS
Red Sox's Luis Guerrero: Returns to big leagues
The Red Sox recalled Guerrero from Triple-A Worcester on Sunday.
He'll be joining the bullpen as a replacement for right-hander Justin Slaten (shoulder), who was placed on the 15-day injured list in a corresponding move. Guerrero had two stints with the big club earlier this season, making four relief appearances while logging a 1.69 ERA and 1.13 WHIP over 5.1 innings. Expect the Red Sox to use him primarily in lower-leverage spots.
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Beau Brieske RP | DET
Tigers' Beau Brieske: Takes second loss
Brieske (1-2) allowed one run on two hits across an inning of relief to take the loss Saturday against the Royals,
Detroit starter Tarik Skubal logged seven scoreless innings but the Tigers were blanked on the day, which left Brieske with the loss when he allowed a run in the eighth. After compiling a 3.59 ERA and 69 strikeouts across 67.2 regular-season innings last year, the righty has been less effective in 2025 when healthy with a 4.95 ERA and 14 strikeouts across 20 innings. Brieske's 95.8 mph average fastball velocity is the same as 2024 however, so his stuff isn't noticeably different despite the dip in strikeout rate. Expect the 27-year-old to continue getting opportunities to rediscover his prior form.
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Trent Thornton RP | CHC
Mariners' Trent Thornton: Starts rehab assignment
Thornton (abdomen) started a minor-league rehab assignment with Triple-A Tacoma on Friday, MLB.com reports.
Thornton, who is recovering from appendicitis, tossed 16 pitches and fanned two in a scoreless inning Friday. The 31-year-old veteran right-hander has been on the injured list since May 9, but he's now tracking toward a return to Seattle's bullpen sometime around the first or second week of June. Thornton has a 5.87 ERA, 1.30 WHIP and 11:4 K:BB over 15.1 innings this season, and he'll likely work as a middle reliever once he rejoins the Mariners.
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Felix Bautista RP | BAL
Orioles' Felix Bautista: Secures save No. 10
Bautista walked two and struck out three in a scoreless ninth inning Saturday to record his 10th save of the season in a 4-2 win over the White Sox.
The right-hander had some trouble finding the plate as he pitched on back-to-back days for just the second time this season, tossing only 11 of 23 pitches for strikes, However, after putting the potential tying run aboard with one out, Bautista rallied to strike out Luis Robert and Austin Slater. Bautista has been struggling over the last few weeks, posting a 7.04 ERA, 1.96 WHIP and 10:8 K:BB over his past 7.2 innings, but he's still converted three of his four save chances during that span.
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Emmanuel Clase RP | CLE
Guardians' Emmanuel Clase: Captures 12th save
Clase pitched a perfect ninth inning in Saturday's 7-5 win over the Angels to record his 12th save of the season.
Clase needed only 10 pitches (seven strikes) to retire the side in the ninth. He'll finish the month of May with seven saves, and his 12 saves on the year is tied with Edwin Diaz and Mason Miller for ninth most in the majors. Clase has a 4.13 ERA, 1.38 WHIP and 24:5 K:BB across 24 innings this season, as he's appeared to stabilize himself after a rough start to the campaign.
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Luis Guerrero RP | BOS
Red Sox's Luis Guerrero: Expected to join big club
The Red Sox are expected to promote Guerrero from Triple-A Worcester on Sunday, Chris Cotillo of MassLive.com reports.
Guerrero has spent most of the season in Triple-A, where he has a 4.43 ERA, 1.24 WHIP and 16:11 K:BB across 20.1 innings. He's made four appearances out of the Red Sox's bullpen this season and has allowed one run on three hits and three walks while striking out four across 5.1 innings.