On this week's Pipeline Podcast, Jim Callis, Jonathan Mayo and Tim McMaster have the latest prospect news out of Arizona. First, Callis catches up with Royals first-round Draft pick Brady Singer at instructs. Then the guys discuss who has stood out early on in the Fall League. Finally, they talk about the Marlins accumulating international bonus money in the hope of landing one or both of the Mesa brothers.

On the MLB Pipeline Podcast, Callis, Mayo and McMaster are your tour guides through all the unfolding stories and breaking news of baseball's top prospects. Each week, you'll find out about the stars of tomorrow from the guys who know today. Look out for new episodes on Thursdays. Download, subscribe and help others find the show by leaving a rating and review on iTunes or your favorite platform.