The 23-year-old righty signed with Toronto this past off-season from Cuba. He has been in Extended Spring Training to start 2019, yet to appear in an official pro game. His 6-foot-5 frame is thin but very loose, showing fluidity and body control through a semi-windup delivery. Gaston’s fastball topped out at 94 mph but dropped off quickly, settling in around 90 mph and dipping to the 87-to-88 mph range by the end of the outing. His 73-to-76 mph curve was loose and lacked sharpness, and though there was consistent depth to the pitch, it often rolled in. Given his three-quarters slot, Gaston could be a candidate to switch to a slider if he gets stronger and increases his armspeed. He wrinkled a low-80s changeup that was a distant third pitch, an early-stages offering that lacks movement.
There’s not enough here for a prospect grade, though Gaston’s background and limited time in pro ball give more reason to project than most 23-year-olds, especially considering his thin frame. He’s a low-probability follow who will need to show better stuff across the board to stand out at higher levels.