Pressure does the strangest things to baseball players. Alex Rodriguez might end up hitting more home runs than anyone else in history, but he has struggled in October. Zack Greinke won the Cy Young in 2009 but would never pitch for a big-market team.

As we look forward to 2011, we can start to pinpoint those who will be under the most pressure. Players struggling to live up to big contracts, coming back from injury, playing for their reputation all make this list, and it only serves to remind us just how many good stories the upcoming season could have.

Begin Slideshow