Walters (lat) struck out the side in the eighth inning Friday for Triple-A Columbus.
Through four rehab appearances, Walters has fanned nine batters over four innings. While he showed a noticeable reduction in velocity in his first outing, the right-hander has bounced back in subsequent appearances. He has yet to pitch on back-to-back days or even twice in three days, however, suggesting Walters will not be coming off the 15-day injured list any time soon. MLB.com pegs him for a potential return at some point in May.