The Pirates placed Horwitz (wrist) on the 10-day injured list Thursday, Kevin Gorman of TribLive.com reports.
Horwitz had right wrist surgery in early February and was given a 6-to-8-week estimated recovery timetable. According to MLB.com, Horwitz has began a throwing progression and is taking swings with the bat, but he's still a few weeks away from game action. Horwitz is expected to serve as the Pirates' primary first baseman once healthy.