The Cleveland Guardians on Monday activated right-handed reliever Hunter Gaddis and outfielder George Valera from the injured list the start of a three-game series against the St. Louis Cardinals. Gaddis (right forearm stiffness) started the season on the 15-day injured list after making one appearance in spring training on Feb. 27. One of the league’s top setup men, Gaddis has a 2.29 ERA in 151 appearance over the past two seasons.