Today is Opening Day for the 2013 Minor League Baseball season. All four full-season Pirates affiliates play this evening, and the starting pitchers can be found on the daily schedule. This week we've been previewing the four affiliates who will be starting their season, along with some analysis for each level of the system. The links to all of those write-ups can be found below, along with the lineups and rotations for all four teams, and our pre-season top 20 prospects that were uploaded back in January. The top 20 prospects are from the 2013 Prospect Guide, which you can purchase on the products page of the site. The Guide is the perfect resource to use throughout the minor league season, especially if you intend on going to games. I use my copy as a reference for pretty much every arti...

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