The Red Sox traded pitcher Luis Guerrero to the Tampa Bay Rays on Tuesday for infielder Tristan Gray, and designated first baseman Nathaniel Lowe for assignment in a corresponding roster move.
The moves came in advance of the deadline across Major League Baseball to add players eligible for the Rule 5 draft in December to 40-man rosters.
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Chris Cotillo of MassLive.com was first to report both the trade and the news of Lowe’s DFA.
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Guerrero will head to the Red Sox’s American League East rival after going 0-1 with a 2.63 ERA in 22 appearances out of Boston’s bullpen over the last two seasons.
Lowe, who won the American League Silver Slugger Award in 2022 with the Texas Rangers, and the AL Gold Glove Award in 2023, played only 37 games for the Red Sox in 2025 after being acquired in a midseason trade with the Washington Nationals.
Lowe batted .280 with two home runs and 16 RBIs in 34 regular-season games after the trade, then went 1 for 7 in the three-game Wild Card series against the New York Yankees.
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Boston is also designating right-handed pitcher Josh Winckowski for assignment, according to multiple reports Tuesday. Winckowski, 27, went 13-14 with a 4.20 ERA in 121 games (21 starts) from 2022-25.
Winckowski is a former 15th-round draft pick (2016) out of high school by the Toronto Blue Jays. He was traded to the Red Sox as part of a three-team swap with the Mets and Kansas City Royals in Feb. 2021.
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Guerrero, 25, made 22 appearances over 2024-25 for #RedSox, posting a 2.63 ERA over 27.1 IP with 19 Ks, 16 BBs and 15 hits allowed. In 69 career AAA games, he has a 3.89 ERA over 85.2 IP with 111 Ks, 56 BBs and 60 hits.
A native of the Dominican Republic, Guerrero was drafted by the Red Sox out of Chipola (Flo.) College in the 17th round of the 2021 MLB Draft.
According to Cotillo, both Winckowski and Lowe will be formally non-tendered (effectively released) on Friday.
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Lowe, 30, will become one of the more intriguing first basemen on the free agent market. He owns a career slash line of .264/.347/.424 in 839 career games with the Rays, Rangers, Nationals and Red Sox. He won a World Series with the Rangers in 2023.
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