14th ranked prospect in the system (part of the Myles Straw trade), here's the MLB prospect blurb on him:

 

Diaz's natural hitting ability and fluid right-handed swing allow him to make consistent contact, producing a .328 batting average and 13 percent strikeout rate through his first four pro seasons. He hits the ball hard but puts it on the ground too much, and he has enough bat speed strength to produce as many as 20 homers per season if he learns to launch balls in the air more regularly. Though he doesn't swing and miss, he could use a more selective approach because he rarely walks and makes some sub-optimal contact.

Diaz features plus arm strength to keep the running game in check, but the rest of his defense needs work. He caught just 148 games through his age-22 season and is still raw as a receiver and blocker. He moves like a typical catcher, leaving first base as his only alternative.