From former Diamondbacks great Randy Johnson to Arizona's 2001 World Series cataclysm Byung-Hun Kim, every pitcher and position player alike begins his career as a prospect.
During that vital time in the minor leagues, from Single-A Rookie Ball to AAA, prospects test their might with the hope of making it to the big leagues.
Along the way, some excel on an accelerated path, while others flounder or find themselves falling backwards. For others, their journey is put on hold by an untimely injury or leave.
For this reason, any given organization's ranking of prospects is in constant flux. As the calendar turns to June, these are the D-Backs' top 10 pitching prospects.