The left-handed hitter has excellent rhythm and tempo in his swing and he is a gap-to-gap hitter rather than a power one.
Diaz has outstanding hands and instincts on defense and, though his arm and lack of speed will likely move him to second, he has shown that he can play on that side of the infield as well.
Diaz played at Springfield Central (Mass.) High School and has committed to play at Vanderbilt University.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.