Here’s what they have to say on David Holmberg:
What he needs to improve: Without having a solid stat base yet, I’m going to say fastball velocity. Of course this is difficult to predict and harder to do, but at 6’4″ he should be able to throw harder than the high 80s. Diamond Futures said “Had Holmberg had a fastball that was a few ticks higher than the Hi-80s that he typically throws, he would have been a top half of the first round talent.” He has the ability to become a top tier prospect, let’s see it.
from today’s Prospects Chat:
Jeff (England): Joe Serafin has made a great start to his pro career, especially for a 37th rounder, with a 4.14 K/BB, 1.67 BB/9 as well as an improving K/9 since his jump to Low-A, but is he is for real? And do you know much about what he throws?
Matthew Eddy: White Sox lefty Joey Serafin works in the mid-80s with a fringy breaking ball, but the University of Vermont product shows poise and command, which often can be enough to dominate in Rookie ball and low Class A.
and from a question on Appalachian League prospects:
The White Sox have an 18-year-old Venezuelan catcher named Miguel Gonzalez with Bristol. He’s got a bit of a thick body but he impressed observers by hitting .300 and by driving the ball consistently (15 doubles). If he can stay at catcher, he’s got a shot.