Jonathan Papelbon, RHP
Papelbon became reliant on his fastball at times last season, with batters sitting on the pitch and smashing it. But overall, the results were just as impressive: a 2.34 ERA and 41 saves in 46 chances. It's what earned him a $6.25 million contract this season, and what has kept the end of games so steady for the Sox.
(Getty Images Photo / J. Meric)