Machado's arm is borderline elite. Don't let his slight frame fool you; he can unleash hellacious throws from shortstop. Sitting next to some scouts during the Fall Instructional League, one scout let out a "Weeeeee!" as Machado wound up to let one loose. His arm is easily the best in the system and can rank right up there in all the minor leagues.
Harrison struggled in every facet of the game in 2012, but his arm strength was a constant that shined throughout. Harrison's arm is at worst a plus tool and some scouts believe it deserves higher marks than that. Eugenio Suarez and David Gonzalez are similar players, both physically and with the skill sets they bring to the table. To that end, both players exhibit plus arm strength that fits well on the left side of the infield.
Another plus arm belongs to second baseman Yerison Pena. A relative unknown, Pena lacks the footwork and instincts for the left side of the infield, but his arm would fit there nicely.
James Robbins (1B)
Had Robbins honored his commitment to Washington State, he would have played both ways as a first baseman and left-handed pitcher. On the mound he has shown velocity in the upper-80s during high school and he can flash an above-average to plus arm when making throws from first base.
Willy Adames (SS)
While he is highly inconsistent at such an early stage of his career, Adames has the ingredients of an easy plus arm. He shows excellent raw arm strength on most throws, but his sloppy mechanics and raw footwork don't always let the ball come out of his hand with that much zip.
Edgar Corcino (IF)
Carlos De Los Santos (IF)
Both Corcino and De Los Santos show above-average arm strength at times, and will even let loose a throw that can earn slightly better grades than that. Corcino's arm works well around the infield and is part of the reason the Tigers attempted to move him behind the plate when he first signed. De Los Santos has a very good arm at second base but will struggle in ways similar to Willy Adames, at times.