The Rangers designated Knizner for assignment Tuesday.
After being dropped from the 26-man roster July 29, Knizner was removed from the 40-man roster Tuesday. The move opens a slot on the 40-man roster for Tyler Mahle (elbow), who was reinstated from the 60-day injured list. Knizner slashed .167/.183/.211 in 93 plate appearances for the Rangers and could garner some interest on waivers from catcher-needy teams.