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Caleb Ferguson RP | STL
Cardinals' Caleb Ferguson: Sent to St. Louis at deadline
The Cardinals acquired Ferguson from the Reds on Monday in exchange for $250,000 in international bonus pool money, Jeff Passan of ESPN.com reports.
Ferguson will help the bullpen from the left side after the Cardinals traded JoJo Romero (abdomen) earlier Monday. The 30-year-old Ferguson has collected a 4.01 ERA and 22:11 K:B over 24.2 frames for the Reds this season and is an impending free agent.
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William Dion RP | WAS
Nationals' Will Dion: Traded to Nationals
The Guardians traded Dion, Josh Hartle, Kendeglys Virguez and Nick Mitchell to the Nationals on Monday in exchange for Foster Griffin, Mark Feinsand of MLB.com reports.
Dion, a 5-foot-10 southpaw, has a 4.58 ERA in 19.2 innings this year out of the big-league bullpen, but his fielding-independent metrics are quite a bit better (2.53 SIERA) thanks to a 29.4 percent strikeout rate and 3.5 percent walk rate. He was optioned to Triple-A on Sunday but could quickly join the Nationals at the big-league level.
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Josh Hartle RP | WAS
Nationals' Josh Hartle: Dealt to Nats
The Guardians traded Hartle, Will Dion, Kendeglys Virguez and Nick Mitchell to the Nationals on Monday in exchange for Foster Griffin, Mark Feinsand of MLB.com reports.
A 23-year-old southpaw, Hartle has a 3.86 ERA, 1.38 WHIP and 88 strikeouts in 93.1 innings at Double-A. He projects as either a back-end starter or middle reliever.
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Antonio Senzatela RP | MIL
Brewers' Antonio Senzatela: Traded to Brewers on Monday
The Brewers acquired Senzatela from the Rockies on Monday in exchange for Mark Manfredi and Juan Martinez.
Senzatela found a groove as a reliever this season, posting a 3.61 ERA and 46:17 K:BB over 52.1 innings. The veteran right-hander has a 7.45 ERA since the beginning of June, but a 20:8 K:BB over 19.1 innings suggests he had some bad luck. Senzatela will likely help set up in Milwaukee and is set to reach free agency after the season.
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Mark Manfredi RP | COL
Rockies' Mark Manfredi: Flipped to Rockies
Manfredi and Juan Martinez were traded from the Brewers to the Rockies on Monday in exchange for Antonio Senzatela, Mark Feinsand of MLB.com reports.
Manfredi is a 26-year-old lefty reliever who has split the year between Double-A and Triple-A. He boasts a 3.35 ERA, 1.23 WHIP and 68:22 K:BB in 45.2 innings across 34 appearances, but his 11.4 percent walk rate is a tad high, as he is also not much of a groundball pitcher (40.9 GB%).
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Tyler Uberstine RP | ATL
Braves' Tyler Uberstine: Heading to Atlanta
Atlanta acquired Uberstine from Boston on Monday in exchange for outfielder Eli White, Mark Feinsand of MLB.com reports.
The 27-year-old made his MLB debut in a 2.2-inning relief appearance with the Red Sox on April 5 but has otherwise spent the entire season in the minors. Over 32 innings at Triple-A Worcester, the right-hander posted a 2.81 ERA, 1.00 WHIP and 37:11 K:BB. He'll likely join the bullpen at Triple-A Gwinnett as he moves on to a new organization.
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Duncan Davitt RP | SF
Braves' Duncan Davitt: Shipped to Atlanta
Atlanta acquired Davitt from the White Sox on Monday in exchange for catcher Joey Bart, Mark Feinsand of MLB.com reports.
After making his second appearance of the season with the White Sox over the weekend, Davitt was designated for assignment earlier Monday when the team needed to open up a spot on the 40-man roster. The 26-year-old righty will reclaim a 40-man spot in Atlanta and is likely to begin his time in the organization at Triple-A Gwinnett. Davitt has spent most of the 2026 campaign with Chicago's Triple-A affiliate in Charlotte, turning in a 6.22 ERA, 1.49 WHIP and 64:25 K:BB across 59.1 innings.
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Clay Holmes SP | CHC
Cubs' Clay Holmes: Catches on with Cubs
The Cubs acquired Holmes (fibula) and outfielder Tyrone Taylor from the Mets on Monday in exchange for infielder Jefferson Rojas, Chelsea Janes of SNY.tv reports.
Holmes didn't end up making it back from the injured list before the trade deadline, but the veteran right-hander showed well enough during the third start of his rehab assignment Sunday at High-A Brooklyn to have plenty of suitors vying for his services. The right-hander will ultimately land with the Cubs, who already bolstered their rotation over the weekend with the acquisition of Kevin Gausman. After covering 5.1 innings and 73 pitches Sunday, Holmes would appear to be stretched out enough to handle a starting role right away with the Cubs, though it's unclear if he'll be in store for a long-term spot in the rotation. Edward Cabrera (hamstring) began a rehab assignment Friday and could eventually emerge as a starting candidate once he returns from the IL, and the Cubs have received quality results of late from back-end rotation members Colin Rea and David Peterson. Holmes may plenty of experience working as a high-leverage reliever, so he might be ticketed for the bullpen once the Cubs pare down their rotation late in the season.
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Ryan Zeferjahn RP | CHC
Cubs' Ryan Zeferjahn: Lands with Cubs via trade
The Cubs acquired Zeferjahn from the Angels on Monday in exchange for catcher Moises Ballesteros and right-hander Mason McGwire, Jeff Fletcher of The Orange County Register reports.
Zeferjahn will bolster a Cubs bullpen that desperately needed help. Given the current complexion of the Cubs' relief crew, Zeferjahn could serve as the closer, though the Cubs could make further additions leading up Monday's deadline. Additionally, Daniel Palencia (elbow) appears to be close to beginning a rehab assignment and moving toward an eventual return from the injured list. Zeferjahn holds a 3.66 ERA and 75:32 K:BB over 51.2 innings for the Angels this season, logging four saves along the way. He's under team control through 2030.
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JoJo Romero RP | MIL
Brewers' JoJo Romero: Traded to Brewers
The Brewers acquired Romero (abdomen) and Dustin May from the Cardinals on Monday, Ken Rosenthal of The Athletic reports.
Romero has been shelved since mid-July following an emergency appendectomy, but he's expected to be ready to return in mid-August. The southpaw has authored a 3.35 ERA and 43:16 K:BB over 43 innings this season and is an impending free agent.