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Emilio Bonifacio, Marlins
Bonifacio is technically the starting center fielder for Miami, so I wasn't sure if he should crack the list. His elite speed will definitely help out, and at 26, he's ready to have a big year after hitting .296 in 2011.
He's also versatile, as he's played at least 23 games at every position other than first base, pitcher and catcher. He isn't a top-15 shortstop per se, but definitely a top-10 utility player.
Ian Desmond, Nationals
He's great in terms of total bases and steals, but the lack of sure-handedness puts him one tier down. Desmond committed 23 errors last season and 34 in 2010.
He's still young at 26 and will definitely improve, but for right now, his all-around game isn't elite.