The Rays acquired Guerrero from the Red Sox on Tuesday in exchange for Tristan Gray.
Guerrero was outrighted off Boston's 40-man roster last week after passing through waivers unclaimed, but now he's on the move to a new organization. The right-hander holds a 2.63 ERA but a 19:16 K:BB across 27.1 frames covering parts of two major-league seasons. Guerrero has a big arm and the Rays will now be tasked with getting him to throw more strikes, which is something they've had success with as an organization with other hurlers.
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Red Sox's Luis Guerrero: Outrighted to Triple-A
Rotowire
The Red Sox outrighted Guerrero to Triple-A Worcester on Thursday, Chris Cotillo of MassLive.com reports.
Guerrero had been designated for assignment last week, and he will remain in the organization after somewhat surprisingly clearing waivers. The hard-throwing reliever has posted a 2.63 ERA but a problematic 19:16 K:BB across 27.1 frames covering parts of two major-league seasons.
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Red Sox's Luis Guerrero: Designated for assignment
Rotowire
The Red Sox activated Guerrero from the 60-day injured list and designated him for assignment Thursday, Chris Cotillo of MassLive.com reports.
Guerrero missed a significant chunk of the 2025 season with an elbow issue, but he's healthy now, having made four appearances in the Dominican winter league. The 25-year-old has an uninspiring 19:16 K:BB over 27.1 innings at the big-league level, but he has a 29.8 percent strikeout rate in the minors and has minor-league options remaining, so Guerrero could draw interest on waivers.
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Red Sox's Luis Guerrero: Initiates rehab assignment
Rotowire
Guerrero (elbow) began a rehab assignment with High-A Greenville on Tuesday and worked around three walks and one hit in a scoreless inning in his first appearance.
The one-inning outing marked Guerrero's first appearance at any level since June 27, as he's been on the shelf for two months while recovering from a right elbow strain. Guerrero is expected to eventually shift his rehab assignment to Triple-A Worcester, and once he gets a few more minor-league appearances under his belt, he could re-emerge as an option for Boston's bullpen.
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Red Sox's Luis Guerrero: Nearing rehab assignment
Rotowire
Guerrero (elbow) threw a 25-pitch live batting practice session Aug. 12 and could soon head out on a rehab assignment, MLB.com reports.
Guerrero is eligible to be activated from the 60-day injured list later this week, but he'll need additional time to complete a rehab assignment before making his return to the Boston bullpen. Before landing on the shelf June 28 due to a right elbow strain, Guerrero compiled a 4.15 ERA, 1.33 WHIP and 10:14 K:BB in 17.1 innings over 13 appearances.
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Red Sox's Luis Guerrero: Shifts to 60-day IL
Rotowire
The Red Sox transferred Guerrero (elbow) to the 60-day injured list Saturday.
Guerrero landed on the injured list in late June with a strained right elbow, and his move to the IL will ensure he remains on the shelf until at least Aug. 27. He'll also cede his spot on the 40-man roster to Nick Burdi (hip), who was reinstated from the 60-day injured list Saturday and optioned to Triple-A.
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Red Sox's Luis Guerrero: Lands on IL with elbow strain
Rotowire
The Red Sox placed Guerrero on the 15-day injured list Saturday due to a right elbow strain.
Guerrero allowed four runs on four hits and three walks while striking out one batter over his last two outings, and his elbow injury may have played a part in his recent poor performance. He's eligible to be reinstated July 13, but a strained elbow to the throwing arm typically results in a longer-than-minimum stint on the IL. To bolster their bullpen, the Red Sox reinstated Chris Murphy (elbow) from the 60-day IL in a corresponding move.
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Red Sox's Luis Guerrero: Returns to big leagues
Rotowire
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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Red Sox's Luis Guerrero: Expected to join big club
Rotowire
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.
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Red Sox's Luis Guerrero: Sent back to Triple-A
Rotowire
The Red Sox optioned Guerrero to Triple-A Worcester on Sunday, Jen McCaffrey of The Athletic reports.
Guerrero was up with the big club for just one day and will be sent back to the minors after giving up an earned run on two hits and three walks over 1.1 innings in the second game of Saturday's doubleheader. Right-hander Zack Kelly was recalled from Triple-A to take Guerrero's spot in the bullpen.
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Red Sox's Luis Guerrero: Returning to majors
Rotowire
The Red Sox recalled Guerrero from Triple-A Worcester on Saturday.
Guerrero has appeared in three major-league games for the Red Sox this season and has tossed four scoreless innings while allowing one hit and striking out three batters without issuing a walk. He has a 4.91 ERA, 1.27 WHIP and 16:10 K:BB across 18.1 innings in Triple-A this season. Guerrero will take the spot in the bullpen vacated by Sean Newcomb, who was designated for assignment by the Red Sox in a corresponding move.
The Red Sox optioned Guerrero to Triple-A Worcester on Saturday.
Since joining Boston on April 24, Guerrero has pitched four shutout innings while striking out three batters and walking none. Despite his performance, he'll end up as the roster casualty with Brennan Bernardino returning from the bereavement list.
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Red Sox's Luis Guerrero: Recalled from Triple-A
Rotowire
The Red Sox recalled Guerrero from Triple-A Worcester on Thursday.
Guerrero holds a 5.23 ERA and 7:5 K:BB over 10.1 frames this season with Worcester. He will provide manager Alex Cora with a fresh arm in the bullpen.
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Red Sox's Luis Guerrero: Optioned to Triple-A
Rotowire
The Red Sox optioned Guerrero to Triple-A Worcester on Wednesday, Chris Cotillo of MassLive.com reports.
Guerrero struck out 10 over 5.2 innings this spring but also walked nine and surrendered six runs. The 24-year-old was terrific during a cup of coffee in the majors last season -- allowing just one unearned run over 10 innings -- and should get another opportunity in the big leagues sooner rather than later.
Guerrero's contract was selected from Triple-A Worcester on Friday, Sean McAdam of MassLive.com reports.
Guerrero is a 24-year-old righty reliever who will be making his big-league debut when he gets into a game. A 17th-round selection in 2021, Guerrero logged a 3.31 ERA, 1.31 WHIP and 79:32 K:BB in 54.1 innings across 42 appearances at Triple-A. He has a plus fastball and solid secondaries, but his poor control may limit him to low-leverage work initially.
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