The Pittsburgh Pirates released struggling veteran designated hitter Marcell Ozuna on Wednesday as they gear up for a playoff push. The club made the move following a nightmarish stretch in which the three-time All-Star could never seem to get on track. Pittsburgh signed Ozuna to a one-year deal worth $12 million in February , a rare free agency splurge for the budget-conscious club. “Didn’t have a season that he would like,” manager Don Kelly said Wednesday in Milwaukee before the Pirates faced the Brewers. Pittsburgh also activated left-handed reliever Evan Sisk off the injured list and optioned reliever Wilber Dotel to Triple-A Indianapolis on Wednesday.