Rosenbaum was in BA's Hot Sheet this week:
Team: Double-A Harrisburg (Eastern)
Age: 24
Why He's Here: 2-0, 2.70, 2 GS, 15 2/3 IP, 10 H, 4 R, 2 ER, 0 BB, 15 SO
The Scoop: Rosenbaum went 3-1, 2.29 in six starts down the stretch for Harrisburg last season and he's picked up where he left off in his return to the Eastern League to begin 2012. Despite pitching his college ball out of the limelight at Xavier and only being a 22nd-round pick in 2009, Rosenbaum has earned his way onto the prospect map by excelling at every level of the minors so far. The lefty doesn't blow hitters away, but he has deception and a quality curveball. He especially made progress with his command last season, and he's kept that going as he's yet to issue a walk in 21 2/3 innings on the year while holding hitters to a .177 average.
http://www.baseballamerica.com/today/prospects/prospect-hot-sheet/2012/2613288.html