He is 0-1 with a 12.91 ERA in eight appearances. It is a small sample size, but in 7 1/3 innings, he has allowed seven hits and eight walks. He has struck out nine. Rosenberg certainly would like to cut down his walks.
"He's learning," manager Charlie Manuel said. "He's new. He's young. He's inexperienced at this level. He's got a good arm. He's got talent."