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Keegan Akin RP | BAL
Orioles' Keegan Akin: Serving as opener
Akin will start Sunday's game against the Athletics, Jacob Calvin Meyer of The Baltimore Sun reports.
Akin served as an opener three times last season will do so again Sunday for the first time in 2026. He's surrendered seven earned runs with a 5:0 K:BB across his first 5.2 innings of the season. Chris Bassitt is expected to follow as the primary pitcher.
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Kody Funderburk RP | MIN
Twins' Kody Funderburk: Heading to Triple-A
The Twins optioned Funderburk to Triple-A St. Paul on Sunday.
Though he's been one of six Twins pitchers to record a save this season and leads the club with six holds, Funderburk will wind up losing his spot in the bullpen as his control continued to slip. He has a 2.81 ERA in 16 innings but a more unsightly 1.38 WHIP and 10:13 K:BB on the season. The Twins recalled left-hander Kendry Rojas from Triple-A to bolster the bullpen.
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Carter Baumler RP | TEX
Rangers' Carter Baumler: Shut down
Baumler (intercostal) has been shut down from his rehab assignment, MLB.com reports.
Baumler made three appearances while on his rehab assignment but experienced a setback and hasn't pitched since April 28. It's unclear when the right-hander will restart a throwing program.
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Jose Espada RP | BAL
Orioles' Jose Espada: Back in majors
The Orioles recalled Espada from Triple-A Norfolk on Sunday.
The 28-year-old fired a scoreless inning while briefly up with the Orioles in April and will now take the roster spot of Lou Trivino, who was designated for assignment Sunday. Espada has struggled at Norfolk early this year with a 5.68 ERA and 9:12 K:BB over 12.2 innings, so he's likely to be limited to low-leverage work for Baltimore.
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Lou Trivino RP | PHI
Orioles' Lou Trivino: Cast off 40-man roster
The Orioles designated Trivino for assignment Sunday.
Baltimore signed Trivino to a one-year deal Monday, but he's now been booted off the 40-man roster less than a week later after yielding six earned runs on six hits and three walks over three innings across two relief appearances. The 34-year-old righty is likely to clear waivers, though he'll have the option of electing free agency if he doesn't intend to stick around in the Orioles organization as bullpen depth at Triple-A Norfolk.
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Caleb Ferguson RP | STL
Reds' Caleb Ferguson: Throws back-to-back days
Ferguson (oblique) walked one over a scoreless inning for Triple-A Louisville on Friday.
Ferguson, who also threw Thursday, worked on back-to-back days for the Bats, which is typically a final box to be checked off for a reliever before coming off the injured list. The left-hander has made four appearances combined between Louisville and Double-A Chattanooga. The Reds' bullpen has fallen apart in May (8.47 ERA) and could use Ferguson as soon as possible.
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Kervin Castro RP | NYY
Yankees' Kervin Castro: Sent back to Triple-A
The Yankees optioned Castro to Triple-A Scranton/Wilkes-Barre.
Castro's stint with the big club lasted just two days, with the reliever making a lone two-inning appearance Friday. His demotion clears a spot on the active roster for Carlos Rodon (elbow), who was reinstated from the 15-day injured list ahead of his start in Sunday's series finale in Milwaukee.
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Brenan Hanifee RP | DET
Tigers' Brenan Hanifee: Starting bullpen game
Hanifee will serve as the Tigers' opening pitcher in Sunday's game against the Royals, Chris McCosky of The Detroit News reports.
The right-hander has some experience as an opener and will start Sunday's bullpen game for Detroit. Since getting called up from Triple-A Toledo in late April, Hanifee has allowed five hits with a 4:1 K:BB across 6.2 scoreless frames in four appearances.
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Mason Miller RP | SD
Padres' Mason Miller: Continues dominant campaign
Miller picked up a save against the Cardinals on Saturday, allowing two walks and striking out four batters over 1.1 hitless and scoreless innings.
Miller came into Saturday having recorded more than three outs just once over 17 appearances. However, he was called upon in the eighth frame with a St. Louis runner on second base and two outs. Miller ended the inning by inducing a groundout and unsurprisingly was back on the mound for the ninth. He got himself into a bit of trouble with a pair of walks, then uncorked a wild pitch on a strikeout to allow the batter to reach first base and load the bases, but Miller ultimately escaped with the save by getting JJ Wetherholt to strike out. The All-Star closer has been utterly dominant so far this season, going 12-for-12 on save chances while allowing just two earned runs and racking up an absurd 38:5 K:BB over 18.2 innings spanning 18 outings.