Robinson Cano, Yankees
In 2012 his WAR was second only to Trout's; without his bat the aging Yankees will collapse. They even felt the void during the WBC. "Things don't feel right without him," said outfielder Brett Gardner.
Yoenis Cespedes, A's
More impressive than his physical gifts were the adjustments he made in '12, his first year in the U.S. His strikeout rate declined from 25% in April to 14.7% in the season's final month.
Alex Cobb, Rays
His fastball is low-90s, but he struck out more batters in camp (28 in 252/3 innings) than any other AL pitcher. "His ball moves all over the place," says David Price.