Every year, players break out. They emerge from team's benches, the minor leagues or the disabled list and win fantasy leagues with exceptional return on minimal investment.
Asking who the "next Mike Trout" is would be a foolish question. Trout's 2012 was unlike any season this decade and will likely not be seen again for another decade. But even pre-Trout seasons produced breakouts.
The following slides list one player at each position poised for such an emergence. I have attempted to steer clear of players merely taking a predictable step and dug a bit deeper to players who may currently be available as late or last round picks. Those are the kind of breakouts that win leagues.