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Zak Kent RP | WAS
Cardinals' Zak Kent: Jettisoned from 40-man roster
The Cardinals designated Kent for assignment Tuesday.
The move clears a spot on the 40-man roster for the addition of Justin Bruihl, who was acquired via trade. Kent was a waiver claim by the Cardinals in December and will now go through the waivers process again. The righty reliever posted a 4.58 ERA and 16:8 K:BB over 17.2 innings for the Guardians in 2025.
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Tyler Mahle SP | ATL
Giants' Tyler Mahle: Grabs one-year deal from Giants
The Giants signed Mahle to a one-year contract Wednesday, Mark Feinsand of MLB.com reports.
Shoulder issues limited Mahle to 16 starts and 86.2 innings in 2025 with the Rangers, but he was able to collect a 2.18 ERA, 1.13 WHIP and 66:29 K:BB. The 31-year-old right-hander has not reached 20 starts in the majors since 2022 and his strikeout rate the last two seasons sits at just 18.9 percent, but he is a worthwhile roll of the dice on a one-year deal and will benefit from spacious Oracle Park as his new home.
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Lyon Richardson RP | MIL
Reds' Lyon Richardson: Pushed off 40-man
The Reds designated Richardson for assignment Saturday, Gordon Wittenmyer of The Cincinnati Enquirer reports.
Following the Reds' acquisition of outfielder Dane Myers (knee) from Miami on Saturday, Richardson will end up as the roster casualty necessary to create space on the 40-man. The 25-year-old reliever finished 2025 with a 4.54 ERA, 1.54 WHIP and 30:21 K:BB across 37.2 regular-season innings. However, his 4.06 FIP indicates that he performed slightly better than what his base stats suggest, and there's a chance another team in need of bullpen depth claims the right-hander off waivers.
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Anthony Molina SP | SF
Braves' Anthony Molina: Sent to Triple-A
Atlanta outrighted Molina to Triple-A Gwinnett on Friday.
Molina was claimed off waivers from the Rockies earlier this month. The 23-year-old right-hander sports an ugly 6.96 ERA, 1.61 WHIP and 65:28 K:BB across 94.1 innings spanning 52 appearances (two starts) over the previous two seasons with Colorado.
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Mason Montgomery RP | PIT
Pirates' Mason Montgomery: Lands with Pirates in trade
The Pirates acquired Montgomery from the Rays on Friday in a three-team trade, Chandler Rome and Ken Rosenthal of The Athletic report.
Montgomery logged a 5.67 ERA and walked 27 over 46 innings with the Rays in 2025, but he also struck out 63 batters and, at 98.7 mph, has one of the hardest average four-seamer velocities in the game. The lefty has past starting experience, but the Pirates are likely to keep Montgomery in the bullpen, and he could work his way into high-leverage appearances.
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Dustin May SP | MIL
Cardinals' Dustin May: Has put weight back on
May said Thursday that he currently weighs 220 pounds after pitching the 2025 season at 198-202 pounds, John Denton of MLB.com reports.
May had surgery for an esophagus rupture in 2024, which made it difficult for him to keep weight on. His goal this offseason has been to put that weight back on, and he hopes to be up to 225 pounds by spring training. May's fastball velocity was in the 59th percentile in 2025 after it was routinely in the 90-plus percentile in previous seasons, and it's possible the weight loss had something to do with it. The 28-year-old also noted that his arm is "back to normal" after he finished the season on the injured list with right elbow neuritis. May took a one-year, "prove it" contract from the Cardinals in hopes of bouncing back and reestablishing his market next offseason.
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Brad Keller RP | PHI
Phillies' Brad Keller: Signs two-year deal with Phillies
The Phillies signed Keller to a two-year, $22 million contract Wednesday, Matt Gelb of The Athletic reports.
Keller was a full-time reliever for the first time in 2025 with the Cubs and excelled, collecting a 2.07 ERA, 0.96 WHIP and 75:22 K:BB over 69.2 regular-season innings. The Phillies intend to keep him in a bullpen role, though his past starting experience allows for the possibility that he could make some starts, if needed. Keller is in line to help set up for closer Jhoan Duran.
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Adrian Houser SP | SF
Giants' Adrian Houser: Gets $22 million pact from Giants
The Giants signed Houser to a two-year, $22 million contract with a club option for 2028 on Tuesday, Jeff Passan of ESPN.com reports.
Houser showed more velocity and put together a bounce-back season in 2025, collecting a 3.31 ERA and 92:38 K:BB over 125 innings covering 21 starts between the White Sox and Rays. The veteran right-hander will turn 33 in February and lands in a favorable home environment in Oracle Park, but Houser's fantasy value will remain limited because of a lack of strikeouts.
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Osvaldo Bido RP | CHW
Braves' Osvaldo Bido: DFA'd by Atlanta
Bido was designated for assignment by Atlanta on Monday.
Bido will lose out on his 40-man roster spot after the club agreed to a one-year deal with Ha-Seong Kim. Bido was claimed off waivers by Atlanta just over a week ago and will now head back to the waiver wire following Monday's transaction.
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Luis Perales RP | WAS
Nationals' Luis Perales: Dealt to Nationals
The Nationals acquired Perales from the Red Sox on Monday in exchange for Jake Bennett, Jeff Passan of ESPN.com reports.
It's a prospect-for-prospect trade. Perales missed a large chunk of 2024 and nearly all of 2025 while recovering from Tommy John surgery, but he's wowed with his stuff since returning, regularly reaching triple digits with his fastball. The 22-year-old has thrown a total of 9.2 innings beyond A-ball and has a career 12.3 percent walk rate in the minors, but Perales' upside is huge.