Welington Castillo-Castillo is off to a slow start with the bat, hitting just .143 in 4 games. Right now, he's splitting time with Steve Clevenger, the 11th best prospect in the organization according to BA, so we'll have to see what the Cubs do to get both enough PT.
Jay Jackson-Jay Jackson struggled in his season debut, allowing nearly every batter would reached first base to score. In 4 innnings of work, he yielded 7 hits, 2 walks, and 6 earned. The 7 hits result in a .438 BAA to start the season.
Bonus-After a solid '08 campaign landed him on TD's top 25 pitchers (at #24), Hung-Wen Chen has come out of the gates on fire. He is 2-0 in his two starts with a 2.31 ERA. He has struck out 9 in 11 and 2/3, but most impressively, he has walked only one batter.