Ellsbury’s record speed

Jacoby Ellsbury broke Tommy Harper’s 36-year-old club record for most bases stolen in a season, surpassing Harper's 54. Like Harper, Ellsbury possesses unique qualities that enable him to be a prolific base stealer. When stealing second, four unique events happen that determine whether he is successful.

SOURCES: Tommy Harper, Red Sox Player Development consultant; Jacoby Ellsbury; Major League Baseball
James Abundis, Daigo Fujiwara, Adam Kilgore, Ed Wiederer/ Globe Staff
Graphic: Red Sox' stolen bases per game (8/13/09)