SALVADOR PEREZ, ROYALS
He's technically not a rookie—his 148 at bats in '11 left him 18 over the threshhold to qualify—but he is only 21. Perez drew raves for his bat (.331/.361/.473) and his work behind the plate. When he returns in the summer after undergoing knee surgery this month, he'll start for K.C.
STAR ON THE RISE
CARLOS SANTANA, INDIANS
In his first year back after suffering a gruesome knee injury in 2010, the Cleveland catcher played 155 games and had a .351 OBP and a team-high 27 homers. As a disciplined switch-hitter with power to all fields who is still just 25, he has plenty of room to become a supernatural star.
STAR IN DECLINE
JUSTIN MORNEAU, TWINS
Morneau said this spring that if the concussion symptoms that have limited him the past two years don't subside, he may retire. The ex-MVP, who was also beset by a wrist injury and shoulder soreness last season, is still only 30, but he looks like a shell of his former self.