Career Leaders for Isolated Power Isolated Power is a SABERmetric statistic that attempts to describe a hitter's overall effectiveness by measuring his ability to generate extra base hits. Isolated Power was created by baseball great Branch Rickey along with Allan Roth during the 1950's and they termed it Power Average. Isolated Power is calculated by substracting batting average from slugging percentage. Important notes: 1,000 career games played are needed to make this list, raw averages are presented to further clarify the one-thousand greatest career isolated power averages of all-time, and a bold faced entry denotes that the player was active during the previous Major League season.

"In 1919, Babe Ruth began to come on strong as a home run hitter, the very first of the kind that baseball had ever known. (Ty) Cobb abhorred Ruth's power game, and when he saw fans becoming enamoured with the Babe, he was afraid that the 'inside style' of bunting, taking the extra base and hitting the ball to gaps that he had perfected would fall by the wayside." - Writer James Kossuth (website, 04/18/2005)