In 27 total appearances, Guerrero accumulated a 4–5 record and 3.23 earned run average (ERA) with 59 strikeouts and 9 saves in 39 innings of work.
[3] On June 30, 2023, Guerrero was selected to play in the All-Star Futures Game, replacing teammate Shane Drohan, who was sidelined with a calf ailment.
In 6 appearances for the Triple–A Worcester Red Sox, he posted a 7.71 ERA with 9 strikeouts and one save in 4+2⁄3 innings of work.
[6] Guerrero began the 2024 campaign with Worcester, compiling a 5–3 record and 3.31 ERA with 79 strikeouts over 54+1⁄3 innings pitched.
[7] In 9 appearances, Guerrero posted a 0.00 ERA with 9 strikeouts and 0.800 walks plus hits per innings pitched (WHIP).