Physical: Tall, rangy frame with plenty of room for strength; narrow waist and broad shoulders; big hands and feet; still growing into body and will get taller.
Mechanics: Starts from semi-windup and three-quarters slot; slot wavers at times; simple in back with small pause; excellent upper-body acceleration; gets to front quickly with quality extension and lands on flexed front leg; recoil in delivery but will not be an issue.
93-98; big time velocity that comes out easy; holds velo (93-96 in 6th); quick arm with good extension that allows ball to get on hitters quickly; slight arm-side run when down in the zone. Locates to both sides of the plate with occasional yanks glove side; will elevate for strikeouts.
Shape wavers from 11/5 to 10/4; still tinkering with grips and gets around it at times; will flash quality 11/5 shape with rotation and late bite; locates to both sides of the plate; gets swings and misses in zone.
Straight change; average fade when thrown with conviction; lacks quality arm speed at present.
Signed out of the Dominican Republic in 2013, the 20-year-old has shown the ability to pitch with a plus-plus fastball and still has projection left in his long, lanky frame. The fastball is the main attraction here, comfortably sitting 93-95 and touching 98 with slight arm-side run. The curveball flashes average spin at times but the shape varies as he continues to tinker with his grip. Alcantara's command profile is lacking at this point but he locates the fastball to both sides of the plate and elevates it for strikeouts when needed. The ceiling is high with Alcantara but the distance to reach it is great. If everything comes together, the Cardinals will have a no. 2 starter on their hands.