MLB Pipeline’s Jim Callis and Jonathan Mayo, along with MLB.com’s Tim McMaster, have the latest prospect news out of Arizona. First, Callis catches up with Royals first-round Draft pick Brady Singer at instructs (:47). Then the guys discuss who has stood out early on in the Fall League (13:42). Finally, they talk about the Marlins accumulating international bonus money in the hope of landing one or both of the Mesa brothers (21:32).

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