Junior Arias, SS, Cincinnati Reds (Rookie-level Arizona League Reds):

An 18-year-old Dominican who received a six-figure bonus in 2008, Arias has blown away scouts with his tools and athleticism in the Arizona complex league. The problem is, he's got some significant holes in his game as well. He's long-limbed and graceful and his current line is .311/.356/.520. That's good. The bad? He'll swing at anything in his zip code and he's a messy defender (21 errors through 31 games at short). With a position switch, he might be more special.

Billy Hamilton, 2B, Cincinnati Reds (Rookie-level Billings):

It's no surprise to see Hamilton leading all short-season players with 26 stolen bases in 44 games— he's a superb athlete and one of the fastest guys in the 2009 MLB draft—but what is shocking is how good he's been at the plate, utilizing a short, quick swing to hit .335/.395/.470 with plenty of speed-based doubles and triples. He's already drawing some comparisons to 13-year big league vet Delino DeShields as a future second baseman with on-base skills and impact speed.