Red Sox designated RHP Luis Guerrero for assignment.
Guerrero, 25, has nice swing-and-miss potential, but he just hasn’t shown he can throw enough strikes to make an impact. He had a 4.15 ERA in 17 1/3 innings as a rookie for the Red Sox last season, but that came with a hideous 10/14 K/BB. Even in the minors, he walked 26 in 31 innings. Despite that, it’s hard to imagine that he’ll clear waivers, especially since he has a couple of option years remaining.