Kevin Goldstein wrote this about Jonathan Correa back at the end of July.
Yet another interesting young arm in the system; 19-year-old Dominican has 25 Ks over 16 innings in last three starts thanks to 91-93 mph fastball and plus slider.
2010 was Correa's age 19 season (he turned 20 in September). As a 19-year old in the hitter friendly AZL and Pioneer League, Correa posted a 3.26 ERA and 19 BB/83 K ratio in 66.1 innings. He's 6-foot-1 168 pounds, so there's room for projection there. He's already throwing 91-93 mph and has a chance to add another mph or two. His slider is already a plus pitch, and I'm sure Mario Soto will work with him on a changeup, if he isn't already. There's a lot to like here.