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Ben Revere, Philadelphia Phillies (date of birth: May 3, 1988).
Maybe Revere is just a one-dimensional player, but that one dimension is awfully important.
His speed is an asset in the outfield and on the basepaths. He's worthy of starting on a contender because that agility compensates for his lack of brute strength.
Dayan Viciedo, Chicago White Sox (date of birth: March 10, 1989).
Viciedo's first full major league season included 25 home runs, the most of any under-25 American League player not named Mike Trout.
He was terrific at the plate in May and September, but otherwise very inconsistent. His long stroke results in a lot of swings-and-misses.
With Adam Dunn and Paul Konerko on the Chicago White Sox roster, "Tank" is miscast as a left fielder. The thickly-built Cuban would be less of a defensive liability at either designated hitter or first base.
Jesus Montero, Seattle Mariners (date of birth: November 28, 1989).
Montero—like many 2012 Seattle Mariners—wasn't productive at Safeco Field.
Of course, his ballpark's dimensions do not entirely excuse such mediocrity. The former top prospect was more eager than he should have been by swinging at about one-third of all first pitches.
Montero tells Geoff Baker of The Seattle Times that the agility training he focused on during the winter should make him "a little bit better" at running the bases. Prior to it, he seldom took extra bases and hadn't succeeded with a steal attempt at any professional level since 2008.
Following his frustrating campaign, the 23-year-old is excelling in spring training (.500/.563/.929 entering Mar. 5).
Will Middlebrooks, Boston Red Sox (date of birth: September 9, 1988).
Though highly-touted as a draft pick out of Liberty Eylau High School, Will Middlebrooks took a few years to develop his power stroke. That's why he didn't receive an MLB call-up until age 23.
But after slugging .509 in 75 games, it's safe to say that Middlebrooks was worth the wait for the Boston Red Sox.
The 6'4" third baseman is also relatively athletic for his position.
It would be irresponsible to rank him any higher, however, until he gets more experience and an improved strikeout-to-walk ratio.