Boston Red Sox's Dustin Pedroia swings a weighted bat in the on-deck circle during the first inning of the Red Sox's baseball game against the Baltimore Orioles at Fenway Park in Boston on Tuesday, ... more 

Boston Red Sox's Dustin Pedroia swings a weighted bat in the on-deck circle during the first inning of the Red Sox's baseball game against the Baltimore Orioles at Fenway Park in Boston on Tuesday, June 5, 2012. (AP Photo/Elise Amendola) less