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Divish wrote that his fastball was 91 - 97. Adam Moore caught him and said that his fastball "cuts and sinks", so I am assuming as you do that he throws a few different types of fastball (4 seam, sinker, cutter).
I know that linking another site is crass, but everyone should read Jeff's interview segments with Curto and Divish. Divish's account of the 5th inning makes me giddy. Ditto Curto's summary.
http://www.lookoutlanding.com/2010/6/24/1534610/michael-pinedas-debut