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.
