Baseball America writes up the Top 19 prospects in the Dominican Summer League. It's subscriber-only content, but BA says Sanchez had "superlative" performance, a "feel for hitting and for the strike zone" and rough defense behind the plate.
Sanchez is a switch-hitter who played catcher and first base last year with a .348/.458/.502 line. He walked more than he struck out. He's 19 this season.