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About as obvious a choice as you're going to find on this list, Pujols' 2011 contract year hasn't exactly gone like his previous 10 years.
Everything is down.
A career .329 hitter, Albert's 2011 average sits at .278.
His OBP of .353 is roughly 70 points off his lifetime mark.
Slugging? Pujols' 2011 SLG percentage is .473, which is 204 points off his career mark of .616! (seriously though, why did anyone ever pitch to him?)
Albert's walk totals are also down, even though he isn't swinging at any more pitches than he usually does out of the strike zone.
Basically, Pujols is just hitting more ground balls than usual, which accounts for some of the drop in production.
I'm not sure where all the power went and, unless there's an undisclosed injury, I doubt anyone else knows either.
Nothing in the peripherals would lead you to believe Pujols is pressing, and my lack of a psychology degree makes me unqualified to guess about the impact of his contract situation on his psyche.
At the end of the day though, it's Pujols. Don't be surprised when he turns it on.
(Note: When I started this article late last week, Pujols was slugging .412. That turned around pretty quick.)
Honorable Mention: Ryan Howard (Unless you're an RBI guy)