4. Marco Gonzales, 22
From one prospect with MLB experience, to another in the 22-year old Gonzales. Gonzales is 16 innings shy of losing his rookie eligibility and should be a strong contender for 2015 NL Rookie of the Year if he lands in the starting rotation. Gonzales pitched in 6 post season innings in 2014 and Cardinals fans saw just how effective he could become. What stood out for Gonzales in his 2014 minor league season is his ability to locate his pitches and his use of 3 quality pitches, led by his devastating change-up. While Gonzales’ fastball sits in the low-90’s, it appears much faster thanks to that change-up. To go along with the fastball and change, Gonzales is developing a strong slider that is deadly to left-handed hitters. His role in 2015 is TBD and he will likely be in a spring training battle with Carlos Martinez for the 5th spot in the rotation. My preference would be to have Gonzales pitch every fifth day and Martinez setting up Trevor Rosenthal. With that said, Mike Matheny can’t go wrong either way.