MLB Playoff Watch: One rookie who could make a difference for each contender

With three National League teams currently one game out of a wild-card spot, the difference could be a rookie. 

In Cincinnati, Elly De La Cruz and Matt McLain have electrified the Reds. The Marlins’ Eury Pérez, meanwhile, just struck out 10 Dodgers batters in six scoreless innings (then

that helped explain his success). And In Arizona, is it possible that Rookie of the Year favorite Corbin Carroll lifts the Diamondbacks…