Braves RHP Didier Fuentes debuted Friday night and looked okay for a guy who turned 20 just a few days ago (June 17). He allowed four runs in five innings but walked just one Marlin against three strikeouts. Pitchers a lot further along in their development have had much worse big league debuts, so while the statline isn’t impressive on its own, Fuentes is a rocketship of a pitching prospect in an organization that tends to coach these types into orbit. He started this season in High-A and has now pitched at four levels mostly as a teenager. His fastball velo was in the 81st percentile Friday night, and his 6.8 foot extension was in the 76th percentile. The heater got hit around in his debut, but I think it’s going to work against major league hitters as he grows into his early 20’s. Pretty good chance this was a spot start, and he’ll go back to Triple-A to get more than the one start he logged at that level.