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Kelly will be a part of the Diamondbacks' 60-man summer camp.
Kelly, who is not on the 40-man roster, spent last season at Low-A, where he started 22 games and posted a 2.15 ERA with a 126:39 K:BB in 100.1 innings. The 21-year-old was included for developmental purposes and would only pitch in the majors in an emergency situation.
