Along with Cole Gillespie, Mercedes joined the Diamondbacks in the Felipe Lopez trade with the Brewers last July. His career started to take off when Milwaukee moved him to the bullpen two months into the 2008 season. Working in relief, Mercedes sits at 89-93 mph with his sinker. He has a whip-like motion and gets tremendous dive on his sinker when he keeps it down in the zone. His low-80s slider has the chance to be a plus pitch if it gains more consistency. He also has a changeup, though he doesn't use it much as a reliever. Scouts have compared him physically to LaTroy Hawkins. Mercedes needs to work on repeating his delivery and commanding his pitches. He doesn't have the pure stuff to be a closer or set-up man, but he could develop into a seventh-inning reliever. After finishing last year in Double-A, he'll return there in 2010 and should reach Triple-A before season's end.
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