Ever since the playoffs began, there has always been that player who comes out of nowhere and has a breakout "second season." For example, take David Freese from last year.
There are the superstars who must keep their weight and pressure upheld in order for their teams to make the postseason. Players like Mike Trout, Josh Hamilton and Derek Jeter are expected to lead their team's ship.
However, players like Freese and Cody Ross in 2010 are two past examples of dark horse players who made a difference.
Here are the five who might be in that same conversation this year.