Marciano's career mark unique but flawed?

Rocky Marciano remains the only heavyweight champ to retire undefeated. How significant is his 49-0 record?

Originally Published: September 21, 2005
By Tim Struby | Special to ESPN.com

Decades before Rocky Balboa fought a fictitious bout at the Philadelphia Spectrum, the authentic, original Rocky endured one of the all-time great battles en route to the world heavyweight title at Philadelphia Municipal Stadium.

The date was Sept. 23, 1952. Heading into the late rounds, 29-year-old contender Rocky Marciano already had been knocked down for the first time in his career. His quest for a 43rd career victory without a loss appeared in jeopardy. But when Marciano dropped ...

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