A converted catcher, Diaz still was new to pitching when the Mets signed him in 2009, and it has taken him some time to learn his craft. He spent two seasons in the Rookie-level Appalachian League before breaking out this summer in the NY-P, which he led in strikeouts (87). He has worked hard to trim down his catcher?s frame, and his feel for pitching took a major leap forward this summer, though he still works too many deep counts. Diaz?s bread and butter is a 92-94 mph sinker that bores in on righties and drops off the table. He has flashed even more velocity at times, reaching 98 last winter in the Venezuelan League. His secondary stuff is just fair currently. He flashes a promising power slider at times, but it remains inconsistent, as does his changeup. To have a chance to stick as a starter, Diaz still needs to improve his command and alter approach to become more efficient, and he must develop his offspeed stuff. He profiles better as a middle reliever at this stage.
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