Fantasy baseball goes deeper into the player pool than contests in other sports. In a typical 12-team roto league, over 300 players are rostered at any given time, and roughly 500 men will populate a roster at some point in the season. For this reason, depth is definitely a key component of winning baseball leagues. But at the same time, there are a few players each year who define the fantasy campaign, either by posting eye-popping numbers, dramatically exceeding expectations — or falling flat on their faces.