1. Bryce Harper, Nationals:
Harper might play all of the 2012 season at age 19, but it would be a mistake to think that's a reason he won't be in Washington this year. All signs point to him getting every chance to make the Opening Day roster, and why not? Harper has already shown an ability to make adjustments. He started out slowly after his double-jump to Double-A last summer, but was just heating up when he got shut down by a minor hamstring injury. No matter, Harper simply went to the Arizona Fall League and raked there. His plus power shows up in games consistently, and he didn't strike out quite as much as some thought he would. Harper gets on base, is an aggressive baserunner and is improving in the outfield, where his plus arm works very well. He could be ready to take the nation's capital by storm on Opening Day.