Michael Wacha, Cardinals
Credit: Rob Carr / Getty Images

The best big-league prospects come out of the Cardinal's farm system. Here's the evidence: In 15 career starts, Joe Kelly is 9-3 with a 2.28 ERA and he might have to begin this year in the bullpen because of guys like Michael Wacha, who nearly no-hit the Washington Nationals on Sept. 24 and carried that trend into the postseason, where he won his first four while striking out 28 batters in 27 innings. Wacha turns 23 this year and, if last year's playoff performance was any indication, he'll be one of baseball's top arms for years to come.