Mathias (shoulder) is expected to be out until early May, MLB.com's Mike Rosenbaum reports.
He suffered a dislocated left shoulder and a slight tear in his labrum while diving for a groundball in a Cactus League game on March 11, and while he has avoided surgery, rehabbing the injury will take at least four weeks. Mathias is a gifted hitter with excellent plate skills (87:48 K:BB in 115 games at High-A last year), and has a chance to be an average everyday second baseman at the big-league level. He is expected to report to Double-A Akron when healthy.