August 13, 2016
ANALYSIS
A 27-year-old righty out of the Dominican Republic, Castillo has languished in Double-A this year, posting a 5.68 ERA and 1.54 WHIP over 50.2 innings. He'll probably struggle to catch on elsewhere this season, as the minor league season ends in roughly three weeks. However, he could receive a minor league deal from another club next spring.