Red Sox Outright Luis Guerrero

Red Sox right-hander Luis Guerrero, who was designated for assignment last week, went unclaimed on outright waivers and has been assigned to Triple-A Worcester, reports Chris Cotillo of MassLive.com. He lacks the service time or prior outright needed to elect free agency, so he’ll remain with the organization as non-roster depth.

Guerrero, 25, has pitched 27 1/3 innings of relief for Boston over the past two seasons. He sports a sharp 2.63 ERA in that time and sits 96.9 mph with his heater, perhaps making it a bit surprising that he went unclaimed at first glance. However, Guerrero went on the injured list with an elbow sprain back in June and never returned — though he never required any type of surgery to address the injury. The Sox moved him to the 60-day IL in August. Guerrero also has poor command, walking nearly 15% of his opponents against just a 17.6% strikeout rate in the majors.

The hard-throwing Guerrero’s minor league numbers are more alarming. He has a respectable enough 3.89 ERA in parts of three Triple-A seasons but saw that mark jump to 4.39 in 2025. He’s walked or plunked an untenable 17.4% of his opponents at the top minor league level, and in 2025 walked nearly 19% of the minor league hitters he faced in 31 innings.

Guerrero has, at times, posted gaudy strikeout and swinging-strike rates. The velocity is impressive, and he has a pair of minor league options remaining. That all makes him a nice depth piece whom the Sox are surely glad to retain, but he’ll need to further refine his well below-average command if he’s to carve out a steady role in a major league bullpen. Assuming his elbow is healed, he’ll be in big league camp with the Sox and hope to pitch his way back into the mix for a 40-man roster spot.